gql_pagination.go

// Copyright 2019-present Facebook
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Code generated by entc, DO NOT EDIT.

package ent

import (
	"context"
	"errors"
	"fmt"
	"io"
	"strconv"

	"entgo.io/contrib/entgql"
	"entgo.io/contrib/entgql/internal/todouuid/ent/billproduct"
	"entgo.io/contrib/entgql/internal/todouuid/ent/category"
	"entgo.io/contrib/entgql/internal/todouuid/ent/friendship"
	"entgo.io/contrib/entgql/internal/todouuid/ent/group"
	"entgo.io/contrib/entgql/internal/todouuid/ent/todo"
	"entgo.io/contrib/entgql/internal/todouuid/ent/user"
	"entgo.io/ent"
	"entgo.io/ent/dialect/sql"
	"github.com/99designs/gqlgen/graphql"
	"github.com/99designs/gqlgen/graphql/errcode"
	"github.com/google/uuid"
	"github.com/vektah/gqlparser/v2/gqlerror"
)

// Common entgql types.
type (
	Cursor         = entgql.Cursor[uuid.UUID]
	PageInfo       = entgql.PageInfo[uuid.UUID]
	OrderDirection = entgql.OrderDirection
)

func orderFunc(o OrderDirection, field string) func(*sql.Selector) {
	if o == entgql.OrderDirectionDesc {
		return Desc(field)
	}
	return Asc(field)
}

const errInvalidPagination = "INVALID_PAGINATION"

func validateFirstLast(first, last *int) (err *gqlerror.Error) {
	switch {
	case first != nil && last != nil:
		err = &gqlerror.Error{
			Message: "Passing both `first` and `last` to paginate a connection is not supported.",
		}
	case first != nil && *first < 0:
		err = &gqlerror.Error{
			Message: "`first` on a connection cannot be less than zero.",
		}
		errcode.Set(err, errInvalidPagination)
	case last != nil && *last < 0:
		err = &gqlerror.Error{
			Message: "`last` on a connection cannot be less than zero.",
		}
		errcode.Set(err, errInvalidPagination)
	}
	return err
}

func collectedField(ctx context.Context, path ...string) *graphql.CollectedField {
	fc := graphql.GetFieldContext(ctx)
	if fc == nil {
		return nil
	}
	field := fc.Field
	oc := graphql.GetOperationContext(ctx)
walk:
	for _, name := range path {
		for _, f := range graphql.CollectFields(oc, field.Selections, nil) {
			if f.Alias == name {
				field = f
				continue walk
			}
		}
		return nil
	}
	return &field
}

func hasCollectedField(ctx context.Context, path ...string) bool {
	if graphql.GetFieldContext(ctx) == nil {
		return true
	}
	return collectedField(ctx, path...) != nil
}

const (
	edgesField      = "edges"
	nodeField       = "node"
	pageInfoField   = "pageInfo"
	totalCountField = "totalCount"
)

func paginateLimit(first, last *int) int {
	var limit int
	if first != nil {
		limit = *first + 1
	} else if last != nil {
		limit = *last + 1
	}
	return limit
}

// BillProductEdge is the edge representation of BillProduct.
type BillProductEdge struct {
	Node   *BillProduct `json:"node"`
	Cursor Cursor       `json:"cursor"`
}

// BillProductConnection is the connection containing edges to BillProduct.
type BillProductConnection struct {
	Edges      []*BillProductEdge `json:"edges"`
	PageInfo   PageInfo           `json:"pageInfo"`
	TotalCount int                `json:"totalCount"`
}

func (c *BillProductConnection) build(nodes []*BillProduct, pager *billproductPager, after *Cursor, first *int, before *Cursor, last *int) {
	c.PageInfo.HasNextPage = before != nil
	c.PageInfo.HasPreviousPage = after != nil
	if first != nil && *first+1 == len(nodes) {
		c.PageInfo.HasNextPage = true
		nodes = nodes[:len(nodes)-1]
	} else if last != nil && *last+1 == len(nodes) {
		c.PageInfo.HasPreviousPage = true
		nodes = nodes[:len(nodes)-1]
	}
	var nodeAt func(int) *BillProduct
	if last != nil {
		n := len(nodes) - 1
		nodeAt = func(i int) *BillProduct {
			return nodes[n-i]
		}
	} else {
		nodeAt = func(i int) *BillProduct {
			return nodes[i]
		}
	}
	c.Edges = make([]*BillProductEdge, len(nodes))
	for i := range nodes {
		node := nodeAt(i)
		c.Edges[i] = &BillProductEdge{
			Node:   node,
			Cursor: pager.toCursor(node),
		}
	}
	if l := len(c.Edges); l > 0 {
		c.PageInfo.StartCursor = &c.Edges[0].Cursor
		c.PageInfo.EndCursor = &c.Edges[l-1].Cursor
	}
	if c.TotalCount == 0 {
		c.TotalCount = len(nodes)
	}
}

// BillProductPaginateOption enables pagination customization.
type BillProductPaginateOption func(*billproductPager) error

// WithBillProductOrder configures pagination ordering.
func WithBillProductOrder(order *BillProductOrder) BillProductPaginateOption {
	if order == nil {
		order = DefaultBillProductOrder
	}
	o := *order
	return func(pager *billproductPager) error {
		if err := o.Direction.Validate(); err != nil {
			return err
		}
		if o.Field == nil {
			o.Field = DefaultBillProductOrder.Field
		}
		pager.order = &o
		return nil
	}
}

// WithBillProductFilter configures pagination filter.
func WithBillProductFilter(filter func(*BillProductQuery) (*BillProductQuery, error)) BillProductPaginateOption {
	return func(pager *billproductPager) error {
		if filter == nil {
			return errors.New("BillProductQuery filter cannot be nil")
		}
		pager.filter = filter
		return nil
	}
}

type billproductPager struct {
	reverse bool
	order   *BillProductOrder
	filter  func(*BillProductQuery) (*BillProductQuery, error)
}

func newBillProductPager(opts []BillProductPaginateOption, reverse bool) (*billproductPager, error) {
	pager := &billproductPager{reverse: reverse}
	for _, opt := range opts {
		if err := opt(pager); err != nil {
			return nil, err
		}
	}
	if pager.order == nil {
		pager.order = DefaultBillProductOrder
	}
	return pager, nil
}

func (p *billproductPager) applyFilter(query *BillProductQuery) (*BillProductQuery, error) {
	if p.filter != nil {
		return p.filter(query)
	}
	return query, nil
}

func (p *billproductPager) toCursor(bp *BillProduct) Cursor {
	return p.order.Field.toCursor(bp)
}

func (p *billproductPager) applyCursors(query *BillProductQuery, after, before *Cursor) (*BillProductQuery, error) {
	direction := p.order.Direction
	if p.reverse {
		direction = direction.Reverse()
	}
	for _, predicate := range entgql.CursorsPredicate(after, before, DefaultBillProductOrder.Field.column, p.order.Field.column, direction) {
		query = query.Where(predicate)
	}
	return query, nil
}

func (p *billproductPager) applyOrder(query *BillProductQuery) *BillProductQuery {
	direction := p.order.Direction
	if p.reverse {
		direction = direction.Reverse()
	}
	query = query.Order(p.order.Field.toTerm(direction.OrderTermOption()))
	if p.order.Field != DefaultBillProductOrder.Field {
		query = query.Order(DefaultBillProductOrder.Field.toTerm(direction.OrderTermOption()))
	}
	if len(query.ctx.Fields) > 0 {
		query.ctx.AppendFieldOnce(p.order.Field.column)
	}
	return query
}

func (p *billproductPager) orderExpr(query *BillProductQuery) sql.Querier {
	direction := p.order.Direction
	if p.reverse {
		direction = direction.Reverse()
	}
	if len(query.ctx.Fields) > 0 {
		query.ctx.AppendFieldOnce(p.order.Field.column)
	}
	return sql.ExprFunc(func(b *sql.Builder) {
		b.Ident(p.order.Field.column).Pad().WriteString(string(direction))
		if p.order.Field != DefaultBillProductOrder.Field {
			b.Comma().Ident(DefaultBillProductOrder.Field.column).Pad().WriteString(string(direction))
		}
	})
}

// Paginate executes the query and returns a relay based cursor connection to BillProduct.
func (bp *BillProductQuery) Paginate(
	ctx context.Context, after *Cursor, first *int,
	before *Cursor, last *int, opts ...BillProductPaginateOption,
) (*BillProductConnection, error) {
	if err := validateFirstLast(first, last); err != nil {
		return nil, err
	}
	pager, err := newBillProductPager(opts, last != nil)
	if err != nil {
		return nil, err
	}
	if bp, err = pager.applyFilter(bp); err != nil {
		return nil, err
	}
	conn := &BillProductConnection{Edges: []*BillProductEdge{}}
	ignoredEdges := !hasCollectedField(ctx, edgesField)
	if hasCollectedField(ctx, totalCountField) || hasCollectedField(ctx, pageInfoField) {
		hasPagination := after != nil || first != nil || before != nil || last != nil
		if hasPagination || ignoredEdges {
			if conn.TotalCount, err = bp.Clone().Count(ctx); err != nil {
				return nil, err
			}
			conn.PageInfo.HasNextPage = first != nil && conn.TotalCount > 0
			conn.PageInfo.HasPreviousPage = last != nil && conn.TotalCount > 0
		}
	}
	if ignoredEdges || (first != nil && *first == 0) || (last != nil && *last == 0) {
		return conn, nil
	}
	if bp, err = pager.applyCursors(bp, after, before); err != nil {
		return nil, err
	}
	if limit := paginateLimit(first, last); limit != 0 {
		bp.Limit(limit)
	}
	if field := collectedField(ctx, edgesField, nodeField); field != nil {
		if err := bp.collectField(ctx, graphql.GetOperationContext(ctx), *field, []string{edgesField, nodeField}); err != nil {
			return nil, err
		}
	}
	bp = pager.applyOrder(bp)
	nodes, err := bp.All(ctx)
	if err != nil {
		return nil, err
	}
	conn.build(nodes, pager, after, first, before, last)
	return conn, nil
}

// BillProductOrderField defines the ordering field of BillProduct.
type BillProductOrderField struct {
	// Value extracts the ordering value from the given BillProduct.
	Value    func(*BillProduct) (ent.Value, error)
	column   string // field or computed.
	toTerm   func(...sql.OrderTermOption) billproduct.OrderOption
	toCursor func(*BillProduct) Cursor
}

// BillProductOrder defines the ordering of BillProduct.
type BillProductOrder struct {
	Direction OrderDirection         `json:"direction"`
	Field     *BillProductOrderField `json:"field"`
}

// DefaultBillProductOrder is the default ordering of BillProduct.
var DefaultBillProductOrder = &BillProductOrder{
	Direction: entgql.OrderDirectionAsc,
	Field: &BillProductOrderField{
		Value: func(bp *BillProduct) (ent.Value, error) {
			return bp.ID, nil
		},
		column: billproduct.FieldID,
		toTerm: billproduct.ByID,
		toCursor: func(bp *BillProduct) Cursor {
			return Cursor{ID: bp.ID}
		},
	},
}

// ToEdge converts BillProduct into BillProductEdge.
func (bp *BillProduct) ToEdge(order *BillProductOrder) *BillProductEdge {
	if order == nil {
		order = DefaultBillProductOrder
	}
	return &BillProductEdge{
		Node:   bp,
		Cursor: order.Field.toCursor(bp),
	}
}

// CategoryEdge is the edge representation of Category.
type CategoryEdge struct {
	Node   *Category `json:"node"`
	Cursor Cursor    `json:"cursor"`
}

// CategoryConnection is the connection containing edges to Category.
type CategoryConnection struct {
	Edges      []*CategoryEdge `json:"edges"`
	PageInfo   PageInfo        `json:"pageInfo"`
	TotalCount int             `json:"totalCount"`
}

func (c *CategoryConnection) build(nodes []*Category, pager *categoryPager, after *Cursor, first *int, before *Cursor, last *int) {
	c.PageInfo.HasNextPage = before != nil
	c.PageInfo.HasPreviousPage = after != nil
	if first != nil && *first+1 == len(nodes) {
		c.PageInfo.HasNextPage = true
		nodes = nodes[:len(nodes)-1]
	} else if last != nil && *last+1 == len(nodes) {
		c.PageInfo.HasPreviousPage = true
		nodes = nodes[:len(nodes)-1]
	}
	var nodeAt func(int) *Category
	if last != nil {
		n := len(nodes) - 1
		nodeAt = func(i int) *Category {
			return nodes[n-i]
		}
	} else {
		nodeAt = func(i int) *Category {
			return nodes[i]
		}
	}
	c.Edges = make([]*CategoryEdge, len(nodes))
	for i := range nodes {
		node := nodeAt(i)
		c.Edges[i] = &CategoryEdge{
			Node:   node,
			Cursor: pager.toCursor(node),
		}
	}
	if l := len(c.Edges); l > 0 {
		c.PageInfo.StartCursor = &c.Edges[0].Cursor
		c.PageInfo.EndCursor = &c.Edges[l-1].Cursor
	}
	if c.TotalCount == 0 {
		c.TotalCount = len(nodes)
	}
}

// CategoryPaginateOption enables pagination customization.
type CategoryPaginateOption func(*categoryPager) error

// WithCategoryOrder configures pagination ordering.
func WithCategoryOrder(order []*CategoryOrder) CategoryPaginateOption {
	return func(pager *categoryPager) error {
		for _, o := range order {
			if err := o.Direction.Validate(); err != nil {
				return err
			}
		}
		pager.order = append(pager.order, order...)
		return nil
	}
}

// WithCategoryFilter configures pagination filter.
func WithCategoryFilter(filter func(*CategoryQuery) (*CategoryQuery, error)) CategoryPaginateOption {
	return func(pager *categoryPager) error {
		if filter == nil {
			return errors.New("CategoryQuery filter cannot be nil")
		}
		pager.filter = filter
		return nil
	}
}

type categoryPager struct {
	reverse bool
	order   []*CategoryOrder
	filter  func(*CategoryQuery) (*CategoryQuery, error)
}

func newCategoryPager(opts []CategoryPaginateOption, reverse bool) (*categoryPager, error) {
	pager := &categoryPager{reverse: reverse}
	for _, opt := range opts {
		if err := opt(pager); err != nil {
			return nil, err
		}
	}
	for i, o := range pager.order {
		if i > 0 && o.Field == pager.order[i-1].Field {
			return nil, fmt.Errorf("duplicate order direction %q", o.Direction)
		}
	}
	return pager, nil
}

func (p *categoryPager) applyFilter(query *CategoryQuery) (*CategoryQuery, error) {
	if p.filter != nil {
		return p.filter(query)
	}
	return query, nil
}

func (p *categoryPager) toCursor(c *Category) Cursor {
	cs := make([]any, 0, len(p.order))
	for _, o := range p.order {
		cs = append(cs, o.Field.toCursor(c).Value)
	}
	return Cursor{ID: c.ID, Value: cs}
}

func (p *categoryPager) applyCursors(query *CategoryQuery, after, before *Cursor) (*CategoryQuery, error) {
	idDirection := entgql.OrderDirectionAsc
	if p.reverse {
		idDirection = entgql.OrderDirectionDesc
	}
	fields, directions := make([]string, 0, len(p.order)), make([]OrderDirection, 0, len(p.order))
	for _, o := range p.order {
		fields = append(fields, o.Field.column)
		direction := o.Direction
		if p.reverse {
			direction = direction.Reverse()
		}
		directions = append(directions, direction)
	}
	predicates, err := entgql.MultiCursorsPredicate(after, before, &entgql.MultiCursorsOptions{
		FieldID:     DefaultCategoryOrder.Field.column,
		DirectionID: idDirection,
		Fields:      fields,
		Directions:  directions,
	})
	if err != nil {
		return nil, err
	}
	for _, predicate := range predicates {
		query = query.Where(predicate)
	}
	return query, nil
}

func (p *categoryPager) applyOrder(query *CategoryQuery) *CategoryQuery {
	var defaultOrdered bool
	for _, o := range p.order {
		direction := o.Direction
		if p.reverse {
			direction = direction.Reverse()
		}
		query = query.Order(o.Field.toTerm(direction.OrderTermOption()))
		if o.Field.column == DefaultCategoryOrder.Field.column {
			defaultOrdered = true
		}
		switch o.Field.column {
		case CategoryOrderFieldTodosCount.column:
		default:
			if len(query.ctx.Fields) > 0 {
				query.ctx.AppendFieldOnce(o.Field.column)
			}
		}
	}
	if !defaultOrdered {
		direction := entgql.OrderDirectionAsc
		if p.reverse {
			direction = direction.Reverse()
		}
		query = query.Order(DefaultCategoryOrder.Field.toTerm(direction.OrderTermOption()))
	}
	return query
}

func (p *categoryPager) orderExpr(query *CategoryQuery) sql.Querier {
	for _, o := range p.order {
		switch o.Field.column {
		case CategoryOrderFieldTodosCount.column:
			direction := o.Direction
			if p.reverse {
				direction = direction.Reverse()
			}
			query = query.Order(o.Field.toTerm(direction.OrderTermOption()))
		default:
			if len(query.ctx.Fields) > 0 {
				query.ctx.AppendFieldOnce(o.Field.column)
			}
		}
	}
	return sql.ExprFunc(func(b *sql.Builder) {
		for _, o := range p.order {
			direction := o.Direction
			if p.reverse {
				direction = direction.Reverse()
			}
			b.Ident(o.Field.column).Pad().WriteString(string(direction))
			b.Comma()
		}
		direction := entgql.OrderDirectionAsc
		if p.reverse {
			direction = direction.Reverse()
		}
		b.Ident(DefaultCategoryOrder.Field.column).Pad().WriteString(string(direction))
	})
}

// Paginate executes the query and returns a relay based cursor connection to Category.
func (c *CategoryQuery) Paginate(
	ctx context.Context, after *Cursor, first *int,
	before *Cursor, last *int, opts ...CategoryPaginateOption,
) (*CategoryConnection, error) {
	if err := validateFirstLast(first, last); err != nil {
		return nil, err
	}
	pager, err := newCategoryPager(opts, last != nil)
	if err != nil {
		return nil, err
	}
	if c, err = pager.applyFilter(c); err != nil {
		return nil, err
	}
	conn := &CategoryConnection{Edges: []*CategoryEdge{}}
	ignoredEdges := !hasCollectedField(ctx, edgesField)
	if hasCollectedField(ctx, totalCountField) || hasCollectedField(ctx, pageInfoField) {
		hasPagination := after != nil || first != nil || before != nil || last != nil
		if hasPagination || ignoredEdges {
			if conn.TotalCount, err = c.Clone().Count(ctx); err != nil {
				return nil, err
			}
			conn.PageInfo.HasNextPage = first != nil && conn.TotalCount > 0
			conn.PageInfo.HasPreviousPage = last != nil && conn.TotalCount > 0
		}
	}
	if ignoredEdges || (first != nil && *first == 0) || (last != nil && *last == 0) {
		return conn, nil
	}
	if c, err = pager.applyCursors(c, after, before); err != nil {
		return nil, err
	}
	if limit := paginateLimit(first, last); limit != 0 {
		c.Limit(limit)
	}
	if field := collectedField(ctx, edgesField, nodeField); field != nil {
		if err := c.collectField(ctx, graphql.GetOperationContext(ctx), *field, []string{edgesField, nodeField}); err != nil {
			return nil, err
		}
	}
	c = pager.applyOrder(c)
	nodes, err := c.All(ctx)
	if err != nil {
		return nil, err
	}
	conn.build(nodes, pager, after, first, before, last)
	return conn, nil
}

var (
	// CategoryOrderFieldText orders Category by text.
	CategoryOrderFieldText = &CategoryOrderField{
		Value: func(c *Category) (ent.Value, error) {
			return c.Text, nil
		},
		column: category.FieldText,
		toTerm: category.ByText,
		toCursor: func(c *Category) Cursor {
			return Cursor{
				ID:    c.ID,
				Value: c.Text,
			}
		},
	}
	// CategoryOrderFieldDuration orders Category by duration.
	CategoryOrderFieldDuration = &CategoryOrderField{
		Value: func(c *Category) (ent.Value, error) {
			return c.Duration, nil
		},
		column: category.FieldDuration,
		toTerm: category.ByDuration,
		toCursor: func(c *Category) Cursor {
			return Cursor{
				ID:    c.ID,
				Value: c.Duration,
			}
		},
	}
	// CategoryOrderFieldCount orders Category by count.
	CategoryOrderFieldCount = &CategoryOrderField{
		Value: func(c *Category) (ent.Value, error) {
			return c.Count, nil
		},
		column: category.FieldCount,
		toTerm: category.ByCount,
		toCursor: func(c *Category) Cursor {
			return Cursor{
				ID:    c.ID,
				Value: c.Count,
			}
		},
	}
	// CategoryOrderFieldTodosCount orders by TODOS_COUNT.
	CategoryOrderFieldTodosCount = &CategoryOrderField{
		Value: func(c *Category) (ent.Value, error) {
			return c.Value("todos_count")
		},
		column: "todos_count",
		toTerm: func(opts ...sql.OrderTermOption) category.OrderOption {
			return category.ByTodosCount(
				append(opts, sql.OrderSelectAs("todos_count"))...,
			)
		},
		toCursor: func(c *Category) Cursor {
			cv, _ := c.Value("todos_count")
			return Cursor{
				ID:    c.ID,
				Value: cv,
			}
		},
	}
)

// String implement fmt.Stringer interface.
func (f CategoryOrderField) String() string {
	var str string
	switch f.column {
	case CategoryOrderFieldText.column:
		str = "TEXT"
	case CategoryOrderFieldDuration.column:
		str = "DURATION"
	case CategoryOrderFieldCount.column:
		str = "COUNT"
	case CategoryOrderFieldTodosCount.column:
		str = "TODOS_COUNT"
	}
	return str
}

// MarshalGQL implements graphql.Marshaler interface.
func (f CategoryOrderField) MarshalGQL(w io.Writer) {
	io.WriteString(w, strconv.Quote(f.String()))
}

// UnmarshalGQL implements graphql.Unmarshaler interface.
func (f *CategoryOrderField) UnmarshalGQL(v interface{}) error {
	str, ok := v.(string)
	if !ok {
		return fmt.Errorf("CategoryOrderField %T must be a string", v)
	}
	switch str {
	case "TEXT":
		*f = *CategoryOrderFieldText
	case "DURATION":
		*f = *CategoryOrderFieldDuration
	case "COUNT":
		*f = *CategoryOrderFieldCount
	case "TODOS_COUNT":
		*f = *CategoryOrderFieldTodosCount
	default:
		return fmt.Errorf("%s is not a valid CategoryOrderField", str)
	}
	return nil
}

// CategoryOrderField defines the ordering field of Category.
type CategoryOrderField struct {
	// Value extracts the ordering value from the given Category.
	Value    func(*Category) (ent.Value, error)
	column   string // field or computed.
	toTerm   func(...sql.OrderTermOption) category.OrderOption
	toCursor func(*Category) Cursor
}

// CategoryOrder defines the ordering of Category.
type CategoryOrder struct {
	Direction OrderDirection      `json:"direction"`
	Field     *CategoryOrderField `json:"field"`
}

// DefaultCategoryOrder is the default ordering of Category.
var DefaultCategoryOrder = &CategoryOrder{
	Direction: entgql.OrderDirectionAsc,
	Field: &CategoryOrderField{
		Value: func(c *Category) (ent.Value, error) {
			return c.ID, nil
		},
		column: category.FieldID,
		toTerm: category.ByID,
		toCursor: func(c *Category) Cursor {
			return Cursor{ID: c.ID}
		},
	},
}

// ToEdge converts Category into CategoryEdge.
func (c *Category) ToEdge(order *CategoryOrder) *CategoryEdge {
	if order == nil {
		order = DefaultCategoryOrder
	}
	return &CategoryEdge{
		Node:   c,
		Cursor: order.Field.toCursor(c),
	}
}

// FriendshipEdge is the edge representation of Friendship.
type FriendshipEdge struct {
	Node   *Friendship `json:"node"`
	Cursor Cursor      `json:"cursor"`
}

// FriendshipConnection is the connection containing edges to Friendship.
type FriendshipConnection struct {
	Edges      []*FriendshipEdge `json:"edges"`
	PageInfo   PageInfo          `json:"pageInfo"`
	TotalCount int               `json:"totalCount"`
}

func (c *FriendshipConnection) build(nodes []*Friendship, pager *friendshipPager, after *Cursor, first *int, before *Cursor, last *int) {
	c.PageInfo.HasNextPage = before != nil
	c.PageInfo.HasPreviousPage = after != nil
	if first != nil && *first+1 == len(nodes) {
		c.PageInfo.HasNextPage = true
		nodes = nodes[:len(nodes)-1]
	} else if last != nil && *last+1 == len(nodes) {
		c.PageInfo.HasPreviousPage = true
		nodes = nodes[:len(nodes)-1]
	}
	var nodeAt func(int) *Friendship
	if last != nil {
		n := len(nodes) - 1
		nodeAt = func(i int) *Friendship {
			return nodes[n-i]
		}
	} else {
		nodeAt = func(i int) *Friendship {
			return nodes[i]
		}
	}
	c.Edges = make([]*FriendshipEdge, len(nodes))
	for i := range nodes {
		node := nodeAt(i)
		c.Edges[i] = &FriendshipEdge{
			Node:   node,
			Cursor: pager.toCursor(node),
		}
	}
	if l := len(c.Edges); l > 0 {
		c.PageInfo.StartCursor = &c.Edges[0].Cursor
		c.PageInfo.EndCursor = &c.Edges[l-1].Cursor
	}
	if c.TotalCount == 0 {
		c.TotalCount = len(nodes)
	}
}

// FriendshipPaginateOption enables pagination customization.
type FriendshipPaginateOption func(*friendshipPager) error

// WithFriendshipOrder configures pagination ordering.
func WithFriendshipOrder(order *FriendshipOrder) FriendshipPaginateOption {
	if order == nil {
		order = DefaultFriendshipOrder
	}
	o := *order
	return func(pager *friendshipPager) error {
		if err := o.Direction.Validate(); err != nil {
			return err
		}
		if o.Field == nil {
			o.Field = DefaultFriendshipOrder.Field
		}
		pager.order = &o
		return nil
	}
}

// WithFriendshipFilter configures pagination filter.
func WithFriendshipFilter(filter func(*FriendshipQuery) (*FriendshipQuery, error)) FriendshipPaginateOption {
	return func(pager *friendshipPager) error {
		if filter == nil {
			return errors.New("FriendshipQuery filter cannot be nil")
		}
		pager.filter = filter
		return nil
	}
}

type friendshipPager struct {
	reverse bool
	order   *FriendshipOrder
	filter  func(*FriendshipQuery) (*FriendshipQuery, error)
}

func newFriendshipPager(opts []FriendshipPaginateOption, reverse bool) (*friendshipPager, error) {
	pager := &friendshipPager{reverse: reverse}
	for _, opt := range opts {
		if err := opt(pager); err != nil {
			return nil, err
		}
	}
	if pager.order == nil {
		pager.order = DefaultFriendshipOrder
	}
	return pager, nil
}

func (p *friendshipPager) applyFilter(query *FriendshipQuery) (*FriendshipQuery, error) {
	if p.filter != nil {
		return p.filter(query)
	}
	return query, nil
}

func (p *friendshipPager) toCursor(f *Friendship) Cursor {
	return p.order.Field.toCursor(f)
}

func (p *friendshipPager) applyCursors(query *FriendshipQuery, after, before *Cursor) (*FriendshipQuery, error) {
	direction := p.order.Direction
	if p.reverse {
		direction = direction.Reverse()
	}
	for _, predicate := range entgql.CursorsPredicate(after, before, DefaultFriendshipOrder.Field.column, p.order.Field.column, direction) {
		query = query.Where(predicate)
	}
	return query, nil
}

func (p *friendshipPager) applyOrder(query *FriendshipQuery) *FriendshipQuery {
	direction := p.order.Direction
	if p.reverse {
		direction = direction.Reverse()
	}
	query = query.Order(p.order.Field.toTerm(direction.OrderTermOption()))
	if p.order.Field != DefaultFriendshipOrder.Field {
		query = query.Order(DefaultFriendshipOrder.Field.toTerm(direction.OrderTermOption()))
	}
	if len(query.ctx.Fields) > 0 {
		query.ctx.AppendFieldOnce(p.order.Field.column)
	}
	return query
}

func (p *friendshipPager) orderExpr(query *FriendshipQuery) sql.Querier {
	direction := p.order.Direction
	if p.reverse {
		direction = direction.Reverse()
	}
	if len(query.ctx.Fields) > 0 {
		query.ctx.AppendFieldOnce(p.order.Field.column)
	}
	return sql.ExprFunc(func(b *sql.Builder) {
		b.Ident(p.order.Field.column).Pad().WriteString(string(direction))
		if p.order.Field != DefaultFriendshipOrder.Field {
			b.Comma().Ident(DefaultFriendshipOrder.Field.column).Pad().WriteString(string(direction))
		}
	})
}

// Paginate executes the query and returns a relay based cursor connection to Friendship.
func (f *FriendshipQuery) Paginate(
	ctx context.Context, after *Cursor, first *int,
	before *Cursor, last *int, opts ...FriendshipPaginateOption,
) (*FriendshipConnection, error) {
	if err := validateFirstLast(first, last); err != nil {
		return nil, err
	}
	pager, err := newFriendshipPager(opts, last != nil)
	if err != nil {
		return nil, err
	}
	if f, err = pager.applyFilter(f); err != nil {
		return nil, err
	}
	conn := &FriendshipConnection{Edges: []*FriendshipEdge{}}
	ignoredEdges := !hasCollectedField(ctx, edgesField)
	if hasCollectedField(ctx, totalCountField) || hasCollectedField(ctx, pageInfoField) {
		hasPagination := after != nil || first != nil || before != nil || last != nil
		if hasPagination || ignoredEdges {
			if conn.TotalCount, err = f.Clone().Count(ctx); err != nil {
				return nil, err
			}
			conn.PageInfo.HasNextPage = first != nil && conn.TotalCount > 0
			conn.PageInfo.HasPreviousPage = last != nil && conn.TotalCount > 0
		}
	}
	if ignoredEdges || (first != nil && *first == 0) || (last != nil && *last == 0) {
		return conn, nil
	}
	if f, err = pager.applyCursors(f, after, before); err != nil {
		return nil, err
	}
	if limit := paginateLimit(first, last); limit != 0 {
		f.Limit(limit)
	}
	if field := collectedField(ctx, edgesField, nodeField); field != nil {
		if err := f.collectField(ctx, graphql.GetOperationContext(ctx), *field, []string{edgesField, nodeField}); err != nil {
			return nil, err
		}
	}
	f = pager.applyOrder(f)
	nodes, err := f.All(ctx)
	if err != nil {
		return nil, err
	}
	conn.build(nodes, pager, after, first, before, last)
	return conn, nil
}

// FriendshipOrderField defines the ordering field of Friendship.
type FriendshipOrderField struct {
	// Value extracts the ordering value from the given Friendship.
	Value    func(*Friendship) (ent.Value, error)
	column   string // field or computed.
	toTerm   func(...sql.OrderTermOption) friendship.OrderOption
	toCursor func(*Friendship) Cursor
}

// FriendshipOrder defines the ordering of Friendship.
type FriendshipOrder struct {
	Direction OrderDirection        `json:"direction"`
	Field     *FriendshipOrderField `json:"field"`
}

// DefaultFriendshipOrder is the default ordering of Friendship.
var DefaultFriendshipOrder = &FriendshipOrder{
	Direction: entgql.OrderDirectionAsc,
	Field: &FriendshipOrderField{
		Value: func(f *Friendship) (ent.Value, error) {
			return f.ID, nil
		},
		column: friendship.FieldID,
		toTerm: friendship.ByID,
		toCursor: func(f *Friendship) Cursor {
			return Cursor{ID: f.ID}
		},
	},
}

// ToEdge converts Friendship into FriendshipEdge.
func (f *Friendship) ToEdge(order *FriendshipOrder) *FriendshipEdge {
	if order == nil {
		order = DefaultFriendshipOrder
	}
	return &FriendshipEdge{
		Node:   f,
		Cursor: order.Field.toCursor(f),
	}
}

// GroupEdge is the edge representation of Group.
type GroupEdge struct {
	Node   *Group `json:"node"`
	Cursor Cursor `json:"cursor"`
}

// GroupConnection is the connection containing edges to Group.
type GroupConnection struct {
	Edges      []*GroupEdge `json:"edges"`
	PageInfo   PageInfo     `json:"pageInfo"`
	TotalCount int          `json:"totalCount"`
}

func (c *GroupConnection) build(nodes []*Group, pager *groupPager, after *Cursor, first *int, before *Cursor, last *int) {
	c.PageInfo.HasNextPage = before != nil
	c.PageInfo.HasPreviousPage = after != nil
	if first != nil && *first+1 == len(nodes) {
		c.PageInfo.HasNextPage = true
		nodes = nodes[:len(nodes)-1]
	} else if last != nil && *last+1 == len(nodes) {
		c.PageInfo.HasPreviousPage = true
		nodes = nodes[:len(nodes)-1]
	}
	var nodeAt func(int) *Group
	if last != nil {
		n := len(nodes) - 1
		nodeAt = func(i int) *Group {
			return nodes[n-i]
		}
	} else {
		nodeAt = func(i int) *Group {
			return nodes[i]
		}
	}
	c.Edges = make([]*GroupEdge, len(nodes))
	for i := range nodes {
		node := nodeAt(i)
		c.Edges[i] = &GroupEdge{
			Node:   node,
			Cursor: pager.toCursor(node),
		}
	}
	if l := len(c.Edges); l > 0 {
		c.PageInfo.StartCursor = &c.Edges[0].Cursor
		c.PageInfo.EndCursor = &c.Edges[l-1].Cursor
	}
	if c.TotalCount == 0 {
		c.TotalCount = len(nodes)
	}
}

// GroupPaginateOption enables pagination customization.
type GroupPaginateOption func(*groupPager) error

// WithGroupOrder configures pagination ordering.
func WithGroupOrder(order []*GroupOrder) GroupPaginateOption {
	return func(pager *groupPager) error {
		for _, o := range order {
			if err := o.Direction.Validate(); err != nil {
				return err
			}
		}
		pager.order = append(pager.order, order...)
		return nil
	}
}

// WithGroupFilter configures pagination filter.
func WithGroupFilter(filter func(*GroupQuery) (*GroupQuery, error)) GroupPaginateOption {
	return func(pager *groupPager) error {
		if filter == nil {
			return errors.New("GroupQuery filter cannot be nil")
		}
		pager.filter = filter
		return nil
	}
}

type groupPager struct {
	reverse bool
	order   []*GroupOrder
	filter  func(*GroupQuery) (*GroupQuery, error)
}

func newGroupPager(opts []GroupPaginateOption, reverse bool) (*groupPager, error) {
	pager := &groupPager{reverse: reverse}
	for _, opt := range opts {
		if err := opt(pager); err != nil {
			return nil, err
		}
	}
	for i, o := range pager.order {
		if i > 0 && o.Field == pager.order[i-1].Field {
			return nil, fmt.Errorf("duplicate order direction %q", o.Direction)
		}
	}
	return pager, nil
}

func (p *groupPager) applyFilter(query *GroupQuery) (*GroupQuery, error) {
	if p.filter != nil {
		return p.filter(query)
	}
	return query, nil
}

func (p *groupPager) toCursor(gr *Group) Cursor {
	cs := make([]any, 0, len(p.order))
	for _, o := range p.order {
		cs = append(cs, o.Field.toCursor(gr).Value)
	}
	return Cursor{ID: gr.ID, Value: cs}
}

func (p *groupPager) applyCursors(query *GroupQuery, after, before *Cursor) (*GroupQuery, error) {
	idDirection := entgql.OrderDirectionAsc
	if p.reverse {
		idDirection = entgql.OrderDirectionDesc
	}
	fields, directions := make([]string, 0, len(p.order)), make([]OrderDirection, 0, len(p.order))
	for _, o := range p.order {
		fields = append(fields, o.Field.column)
		direction := o.Direction
		if p.reverse {
			direction = direction.Reverse()
		}
		directions = append(directions, direction)
	}
	predicates, err := entgql.MultiCursorsPredicate(after, before, &entgql.MultiCursorsOptions{
		FieldID:     DefaultGroupOrder.Field.column,
		DirectionID: idDirection,
		Fields:      fields,
		Directions:  directions,
	})
	if err != nil {
		return nil, err
	}
	for _, predicate := range predicates {
		query = query.Where(predicate)
	}
	return query, nil
}

func (p *groupPager) applyOrder(query *GroupQuery) *GroupQuery {
	var defaultOrdered bool
	for _, o := range p.order {
		direction := o.Direction
		if p.reverse {
			direction = direction.Reverse()
		}
		query = query.Order(o.Field.toTerm(direction.OrderTermOption()))
		if o.Field.column == DefaultGroupOrder.Field.column {
			defaultOrdered = true
		}
		if len(query.ctx.Fields) > 0 {
			query.ctx.AppendFieldOnce(o.Field.column)
		}
	}
	if !defaultOrdered {
		direction := entgql.OrderDirectionAsc
		if p.reverse {
			direction = direction.Reverse()
		}
		query = query.Order(DefaultGroupOrder.Field.toTerm(direction.OrderTermOption()))
	}
	return query
}

func (p *groupPager) orderExpr(query *GroupQuery) sql.Querier {
	if len(query.ctx.Fields) > 0 {
		for _, o := range p.order {
			query.ctx.AppendFieldOnce(o.Field.column)
		}
	}
	return sql.ExprFunc(func(b *sql.Builder) {
		for _, o := range p.order {
			direction := o.Direction
			if p.reverse {
				direction = direction.Reverse()
			}
			b.Ident(o.Field.column).Pad().WriteString(string(direction))
			b.Comma()
		}
		direction := entgql.OrderDirectionAsc
		if p.reverse {
			direction = direction.Reverse()
		}
		b.Ident(DefaultGroupOrder.Field.column).Pad().WriteString(string(direction))
	})
}

// Paginate executes the query and returns a relay based cursor connection to Group.
func (gr *GroupQuery) Paginate(
	ctx context.Context, after *Cursor, first *int,
	before *Cursor, last *int, opts ...GroupPaginateOption,
) (*GroupConnection, error) {
	if err := validateFirstLast(first, last); err != nil {
		return nil, err
	}
	pager, err := newGroupPager(opts, last != nil)
	if err != nil {
		return nil, err
	}
	if gr, err = pager.applyFilter(gr); err != nil {
		return nil, err
	}
	conn := &GroupConnection{Edges: []*GroupEdge{}}
	ignoredEdges := !hasCollectedField(ctx, edgesField)
	if hasCollectedField(ctx, totalCountField) || hasCollectedField(ctx, pageInfoField) {
		hasPagination := after != nil || first != nil || before != nil || last != nil
		if hasPagination || ignoredEdges {
			if conn.TotalCount, err = gr.Clone().Count(ctx); err != nil {
				return nil, err
			}
			conn.PageInfo.HasNextPage = first != nil && conn.TotalCount > 0
			conn.PageInfo.HasPreviousPage = last != nil && conn.TotalCount > 0
		}
	}
	if ignoredEdges || (first != nil && *first == 0) || (last != nil && *last == 0) {
		return conn, nil
	}
	if gr, err = pager.applyCursors(gr, after, before); err != nil {
		return nil, err
	}
	if limit := paginateLimit(first, last); limit != 0 {
		gr.Limit(limit)
	}
	if field := collectedField(ctx, edgesField, nodeField); field != nil {
		if err := gr.collectField(ctx, graphql.GetOperationContext(ctx), *field, []string{edgesField, nodeField}); err != nil {
			return nil, err
		}
	}
	gr = pager.applyOrder(gr)
	nodes, err := gr.All(ctx)
	if err != nil {
		return nil, err
	}
	conn.build(nodes, pager, after, first, before, last)
	return conn, nil
}

// GroupOrderField defines the ordering field of Group.
type GroupOrderField struct {
	// Value extracts the ordering value from the given Group.
	Value    func(*Group) (ent.Value, error)
	column   string // field or computed.
	toTerm   func(...sql.OrderTermOption) group.OrderOption
	toCursor func(*Group) Cursor
}

// GroupOrder defines the ordering of Group.
type GroupOrder struct {
	Direction OrderDirection   `json:"direction"`
	Field     *GroupOrderField `json:"field"`
}

// DefaultGroupOrder is the default ordering of Group.
var DefaultGroupOrder = &GroupOrder{
	Direction: entgql.OrderDirectionAsc,
	Field: &GroupOrderField{
		Value: func(gr *Group) (ent.Value, error) {
			return gr.ID, nil
		},
		column: group.FieldID,
		toTerm: group.ByID,
		toCursor: func(gr *Group) Cursor {
			return Cursor{ID: gr.ID}
		},
	},
}

// ToEdge converts Group into GroupEdge.
func (gr *Group) ToEdge(order *GroupOrder) *GroupEdge {
	if order == nil {
		order = DefaultGroupOrder
	}
	return &GroupEdge{
		Node:   gr,
		Cursor: order.Field.toCursor(gr),
	}
}

// TodoEdge is the edge representation of Todo.
type TodoEdge struct {
	Node   *Todo  `json:"node"`
	Cursor Cursor `json:"cursor"`
}

// TodoConnection is the connection containing edges to Todo.
type TodoConnection struct {
	Edges      []*TodoEdge `json:"edges"`
	PageInfo   PageInfo    `json:"pageInfo"`
	TotalCount int         `json:"totalCount"`
}

func (c *TodoConnection) build(nodes []*Todo, pager *todoPager, after *Cursor, first *int, before *Cursor, last *int) {
	c.PageInfo.HasNextPage = before != nil
	c.PageInfo.HasPreviousPage = after != nil
	if first != nil && *first+1 == len(nodes) {
		c.PageInfo.HasNextPage = true
		nodes = nodes[:len(nodes)-1]
	} else if last != nil && *last+1 == len(nodes) {
		c.PageInfo.HasPreviousPage = true
		nodes = nodes[:len(nodes)-1]
	}
	var nodeAt func(int) *Todo
	if last != nil {
		n := len(nodes) - 1
		nodeAt = func(i int) *Todo {
			return nodes[n-i]
		}
	} else {
		nodeAt = func(i int) *Todo {
			return nodes[i]
		}
	}
	c.Edges = make([]*TodoEdge, len(nodes))
	for i := range nodes {
		node := nodeAt(i)
		c.Edges[i] = &TodoEdge{
			Node:   node,
			Cursor: pager.toCursor(node),
		}
	}
	if l := len(c.Edges); l > 0 {
		c.PageInfo.StartCursor = &c.Edges[0].Cursor
		c.PageInfo.EndCursor = &c.Edges[l-1].Cursor
	}
	if c.TotalCount == 0 {
		c.TotalCount = len(nodes)
	}
}

// TodoPaginateOption enables pagination customization.
type TodoPaginateOption func(*todoPager) error

// WithTodoOrder configures pagination ordering.
func WithTodoOrder(order *TodoOrder) TodoPaginateOption {
	if order == nil {
		order = DefaultTodoOrder
	}
	o := *order
	return func(pager *todoPager) error {
		if err := o.Direction.Validate(); err != nil {
			return err
		}
		if o.Field == nil {
			o.Field = DefaultTodoOrder.Field
		}
		pager.order = &o
		return nil
	}
}

// WithTodoFilter configures pagination filter.
func WithTodoFilter(filter func(*TodoQuery) (*TodoQuery, error)) TodoPaginateOption {
	return func(pager *todoPager) error {
		if filter == nil {
			return errors.New("TodoQuery filter cannot be nil")
		}
		pager.filter = filter
		return nil
	}
}

type todoPager struct {
	reverse bool
	order   *TodoOrder
	filter  func(*TodoQuery) (*TodoQuery, error)
}

func newTodoPager(opts []TodoPaginateOption, reverse bool) (*todoPager, error) {
	pager := &todoPager{reverse: reverse}
	for _, opt := range opts {
		if err := opt(pager); err != nil {
			return nil, err
		}
	}
	if pager.order == nil {
		pager.order = DefaultTodoOrder
	}
	return pager, nil
}

func (p *todoPager) applyFilter(query *TodoQuery) (*TodoQuery, error) {
	if p.filter != nil {
		return p.filter(query)
	}
	return query, nil
}

func (p *todoPager) toCursor(t *Todo) Cursor {
	return p.order.Field.toCursor(t)
}

func (p *todoPager) applyCursors(query *TodoQuery, after, before *Cursor) (*TodoQuery, error) {
	direction := p.order.Direction
	if p.reverse {
		direction = direction.Reverse()
	}
	for _, predicate := range entgql.CursorsPredicate(after, before, DefaultTodoOrder.Field.column, p.order.Field.column, direction) {
		query = query.Where(predicate)
	}
	return query, nil
}

func (p *todoPager) applyOrder(query *TodoQuery) *TodoQuery {
	direction := p.order.Direction
	if p.reverse {
		direction = direction.Reverse()
	}
	query = query.Order(p.order.Field.toTerm(direction.OrderTermOption()))
	if p.order.Field != DefaultTodoOrder.Field {
		query = query.Order(DefaultTodoOrder.Field.toTerm(direction.OrderTermOption()))
	}
	switch p.order.Field.column {
	case TodoOrderFieldParentStatus.column, TodoOrderFieldChildrenCount.column, CategoryOrderFieldCategoryText.column:
	default:
		if len(query.ctx.Fields) > 0 {
			query.ctx.AppendFieldOnce(p.order.Field.column)
		}
	}
	return query
}

func (p *todoPager) orderExpr(query *TodoQuery) sql.Querier {
	direction := p.order.Direction
	if p.reverse {
		direction = direction.Reverse()
	}
	switch p.order.Field.column {
	case TodoOrderFieldParentStatus.column, TodoOrderFieldChildrenCount.column, CategoryOrderFieldCategoryText.column:
		query = query.Order(p.order.Field.toTerm(direction.OrderTermOption()))
	default:
		if len(query.ctx.Fields) > 0 {
			query.ctx.AppendFieldOnce(p.order.Field.column)
		}
	}
	return sql.ExprFunc(func(b *sql.Builder) {
		b.Ident(p.order.Field.column).Pad().WriteString(string(direction))
		if p.order.Field != DefaultTodoOrder.Field {
			b.Comma().Ident(DefaultTodoOrder.Field.column).Pad().WriteString(string(direction))
		}
	})
}

// Paginate executes the query and returns a relay based cursor connection to Todo.
func (t *TodoQuery) Paginate(
	ctx context.Context, after *Cursor, first *int,
	before *Cursor, last *int, opts ...TodoPaginateOption,
) (*TodoConnection, error) {
	if err := validateFirstLast(first, last); err != nil {
		return nil, err
	}
	pager, err := newTodoPager(opts, last != nil)
	if err != nil {
		return nil, err
	}
	if t, err = pager.applyFilter(t); err != nil {
		return nil, err
	}
	conn := &TodoConnection{Edges: []*TodoEdge{}}
	ignoredEdges := !hasCollectedField(ctx, edgesField)
	if hasCollectedField(ctx, totalCountField) || hasCollectedField(ctx, pageInfoField) {
		hasPagination := after != nil || first != nil || before != nil || last != nil
		if hasPagination || ignoredEdges {
			if conn.TotalCount, err = t.Clone().Count(ctx); err != nil {
				return nil, err
			}
			conn.PageInfo.HasNextPage = first != nil && conn.TotalCount > 0
			conn.PageInfo.HasPreviousPage = last != nil && conn.TotalCount > 0
		}
	}
	if ignoredEdges || (first != nil && *first == 0) || (last != nil && *last == 0) {
		return conn, nil
	}
	if t, err = pager.applyCursors(t, after, before); err != nil {
		return nil, err
	}
	if limit := paginateLimit(first, last); limit != 0 {
		t.Limit(limit)
	}
	if field := collectedField(ctx, edgesField, nodeField); field != nil {
		if err := t.collectField(ctx, graphql.GetOperationContext(ctx), *field, []string{edgesField, nodeField}); err != nil {
			return nil, err
		}
	}
	t = pager.applyOrder(t)
	nodes, err := t.All(ctx)
	if err != nil {
		return nil, err
	}
	conn.build(nodes, pager, after, first, before, last)
	return conn, nil
}

var (
	// TodoOrderFieldCreatedAt orders Todo by created_at.
	TodoOrderFieldCreatedAt = &TodoOrderField{
		Value: func(t *Todo) (ent.Value, error) {
			return t.CreatedAt, nil
		},
		column: todo.FieldCreatedAt,
		toTerm: todo.ByCreatedAt,
		toCursor: func(t *Todo) Cursor {
			return Cursor{
				ID:    t.ID,
				Value: t.CreatedAt,
			}
		},
	}
	// TodoOrderFieldStatus orders Todo by status.
	TodoOrderFieldStatus = &TodoOrderField{
		Value: func(t *Todo) (ent.Value, error) {
			return t.Status, nil
		},
		column: todo.FieldStatus,
		toTerm: todo.ByStatus,
		toCursor: func(t *Todo) Cursor {
			return Cursor{
				ID:    t.ID,
				Value: t.Status,
			}
		},
	}
	// TodoOrderFieldPriority orders Todo by priority.
	TodoOrderFieldPriority = &TodoOrderField{
		Value: func(t *Todo) (ent.Value, error) {
			return t.Priority, nil
		},
		column: todo.FieldPriority,
		toTerm: todo.ByPriority,
		toCursor: func(t *Todo) Cursor {
			return Cursor{
				ID:    t.ID,
				Value: t.Priority,
			}
		},
	}
	// TodoOrderFieldText orders Todo by text.
	TodoOrderFieldText = &TodoOrderField{
		Value: func(t *Todo) (ent.Value, error) {
			return t.Text, nil
		},
		column: todo.FieldText,
		toTerm: todo.ByText,
		toCursor: func(t *Todo) Cursor {
			return Cursor{
				ID:    t.ID,
				Value: t.Text,
			}
		},
	}
	// TodoOrderFieldParentStatus orders by PARENT_STATUS.
	TodoOrderFieldParentStatus = &TodoOrderField{
		Value: func(t *Todo) (ent.Value, error) {
			return t.Value("parent_status")
		},
		column: "parent_status",
		toTerm: func(opts ...sql.OrderTermOption) todo.OrderOption {
			return todo.ByParentField(
				todo.FieldStatus,
				append(opts, sql.OrderSelectAs("parent_status"))...,
			)
		},
		toCursor: func(t *Todo) Cursor {
			cv, _ := t.Value("parent_status")
			return Cursor{
				ID:    t.ID,
				Value: cv,
			}
		},
	}
	// TodoOrderFieldChildrenCount orders by CHILDREN_COUNT.
	TodoOrderFieldChildrenCount = &TodoOrderField{
		Value: func(t *Todo) (ent.Value, error) {
			return t.Value("children_count")
		},
		column: "children_count",
		toTerm: func(opts ...sql.OrderTermOption) todo.OrderOption {
			return todo.ByChildrenCount(
				append(opts, sql.OrderSelectAs("children_count"))...,
			)
		},
		toCursor: func(t *Todo) Cursor {
			cv, _ := t.Value("children_count")
			return Cursor{
				ID:    t.ID,
				Value: cv,
			}
		},
	}
	// CategoryOrderFieldCategoryText orders by CATEGORY_TEXT.
	CategoryOrderFieldCategoryText = &TodoOrderField{
		Value: func(t *Todo) (ent.Value, error) {
			return t.Value("category_text")
		},
		column: "category_text",
		toTerm: func(opts ...sql.OrderTermOption) todo.OrderOption {
			return todo.ByCategoryField(
				category.FieldText,
				append(opts, sql.OrderSelectAs("category_text"))...,
			)
		},
		toCursor: func(t *Todo) Cursor {
			cv, _ := t.Value("category_text")
			return Cursor{
				ID:    t.ID,
				Value: cv,
			}
		},
	}
)

// String implement fmt.Stringer interface.
func (f TodoOrderField) String() string {
	var str string
	switch f.column {
	case TodoOrderFieldCreatedAt.column:
		str = "CREATED_AT"
	case TodoOrderFieldStatus.column:
		str = "STATUS"
	case TodoOrderFieldPriority.column:
		str = "PRIORITY_ORDER"
	case TodoOrderFieldText.column:
		str = "TEXT"
	case TodoOrderFieldParentStatus.column:
		str = "PARENT_STATUS"
	case TodoOrderFieldChildrenCount.column:
		str = "CHILDREN_COUNT"
	case CategoryOrderFieldCategoryText.column:
		str = "CATEGORY_TEXT"
	}
	return str
}

// MarshalGQL implements graphql.Marshaler interface.
func (f TodoOrderField) MarshalGQL(w io.Writer) {
	io.WriteString(w, strconv.Quote(f.String()))
}

// UnmarshalGQL implements graphql.Unmarshaler interface.
func (f *TodoOrderField) UnmarshalGQL(v interface{}) error {
	str, ok := v.(string)
	if !ok {
		return fmt.Errorf("TodoOrderField %T must be a string", v)
	}
	switch str {
	case "CREATED_AT":
		*f = *TodoOrderFieldCreatedAt
	case "STATUS":
		*f = *TodoOrderFieldStatus
	case "PRIORITY_ORDER":
		*f = *TodoOrderFieldPriority
	case "TEXT":
		*f = *TodoOrderFieldText
	case "PARENT_STATUS":
		*f = *TodoOrderFieldParentStatus
	case "CHILDREN_COUNT":
		*f = *TodoOrderFieldChildrenCount
	case "CATEGORY_TEXT":
		*f = *CategoryOrderFieldCategoryText
	default:
		return fmt.Errorf("%s is not a valid TodoOrderField", str)
	}
	return nil
}

// TodoOrderField defines the ordering field of Todo.
type TodoOrderField struct {
	// Value extracts the ordering value from the given Todo.
	Value    func(*Todo) (ent.Value, error)
	column   string // field or computed.
	toTerm   func(...sql.OrderTermOption) todo.OrderOption
	toCursor func(*Todo) Cursor
}

// TodoOrder defines the ordering of Todo.
type TodoOrder struct {
	Direction OrderDirection  `json:"direction"`
	Field     *TodoOrderField `json:"field"`
}

// DefaultTodoOrder is the default ordering of Todo.
var DefaultTodoOrder = &TodoOrder{
	Direction: entgql.OrderDirectionAsc,
	Field: &TodoOrderField{
		Value: func(t *Todo) (ent.Value, error) {
			return t.ID, nil
		},
		column: todo.FieldID,
		toTerm: todo.ByID,
		toCursor: func(t *Todo) Cursor {
			return Cursor{ID: t.ID}
		},
	},
}

// ToEdge converts Todo into TodoEdge.
func (t *Todo) ToEdge(order *TodoOrder) *TodoEdge {
	if order == nil {
		order = DefaultTodoOrder
	}
	return &TodoEdge{
		Node:   t,
		Cursor: order.Field.toCursor(t),
	}
}

// UserEdge is the edge representation of User.
type UserEdge struct {
	Node   *User  `json:"node"`
	Cursor Cursor `json:"cursor"`
}

// UserConnection is the connection containing edges to User.
type UserConnection struct {
	Edges      []*UserEdge `json:"edges"`
	PageInfo   PageInfo    `json:"pageInfo"`
	TotalCount int         `json:"totalCount"`
}

func (c *UserConnection) build(nodes []*User, pager *userPager, after *Cursor, first *int, before *Cursor, last *int) {
	c.PageInfo.HasNextPage = before != nil
	c.PageInfo.HasPreviousPage = after != nil
	if first != nil && *first+1 == len(nodes) {
		c.PageInfo.HasNextPage = true
		nodes = nodes[:len(nodes)-1]
	} else if last != nil && *last+1 == len(nodes) {
		c.PageInfo.HasPreviousPage = true
		nodes = nodes[:len(nodes)-1]
	}
	var nodeAt func(int) *User
	if last != nil {
		n := len(nodes) - 1
		nodeAt = func(i int) *User {
			return nodes[n-i]
		}
	} else {
		nodeAt = func(i int) *User {
			return nodes[i]
		}
	}
	c.Edges = make([]*UserEdge, len(nodes))
	for i := range nodes {
		node := nodeAt(i)
		c.Edges[i] = &UserEdge{
			Node:   node,
			Cursor: pager.toCursor(node),
		}
	}
	if l := len(c.Edges); l > 0 {
		c.PageInfo.StartCursor = &c.Edges[0].Cursor
		c.PageInfo.EndCursor = &c.Edges[l-1].Cursor
	}
	if c.TotalCount == 0 {
		c.TotalCount = len(nodes)
	}
}

// UserPaginateOption enables pagination customization.
type UserPaginateOption func(*userPager) error

// WithUserOrder configures pagination ordering.
func WithUserOrder(order *UserOrder) UserPaginateOption {
	if order == nil {
		order = DefaultUserOrder
	}
	o := *order
	return func(pager *userPager) error {
		if err := o.Direction.Validate(); err != nil {
			return err
		}
		if o.Field == nil {
			o.Field = DefaultUserOrder.Field
		}
		pager.order = &o
		return nil
	}
}

// WithUserFilter configures pagination filter.
func WithUserFilter(filter func(*UserQuery) (*UserQuery, error)) UserPaginateOption {
	return func(pager *userPager) error {
		if filter == nil {
			return errors.New("UserQuery filter cannot be nil")
		}
		pager.filter = filter
		return nil
	}
}

type userPager struct {
	reverse bool
	order   *UserOrder
	filter  func(*UserQuery) (*UserQuery, error)
}

func newUserPager(opts []UserPaginateOption, reverse bool) (*userPager, error) {
	pager := &userPager{reverse: reverse}
	for _, opt := range opts {
		if err := opt(pager); err != nil {
			return nil, err
		}
	}
	if pager.order == nil {
		pager.order = DefaultUserOrder
	}
	return pager, nil
}

func (p *userPager) applyFilter(query *UserQuery) (*UserQuery, error) {
	if p.filter != nil {
		return p.filter(query)
	}
	return query, nil
}

func (p *userPager) toCursor(u *User) Cursor {
	return p.order.Field.toCursor(u)
}

func (p *userPager) applyCursors(query *UserQuery, after, before *Cursor) (*UserQuery, error) {
	direction := p.order.Direction
	if p.reverse {
		direction = direction.Reverse()
	}
	for _, predicate := range entgql.CursorsPredicate(after, before, DefaultUserOrder.Field.column, p.order.Field.column, direction) {
		query = query.Where(predicate)
	}
	return query, nil
}

func (p *userPager) applyOrder(query *UserQuery) *UserQuery {
	direction := p.order.Direction
	if p.reverse {
		direction = direction.Reverse()
	}
	query = query.Order(p.order.Field.toTerm(direction.OrderTermOption()))
	if p.order.Field != DefaultUserOrder.Field {
		query = query.Order(DefaultUserOrder.Field.toTerm(direction.OrderTermOption()))
	}
	switch p.order.Field.column {
	case UserOrderFieldGroupsCount.column:
	default:
		if len(query.ctx.Fields) > 0 {
			query.ctx.AppendFieldOnce(p.order.Field.column)
		}
	}
	return query
}

func (p *userPager) orderExpr(query *UserQuery) sql.Querier {
	direction := p.order.Direction
	if p.reverse {
		direction = direction.Reverse()
	}
	switch p.order.Field.column {
	case UserOrderFieldGroupsCount.column:
		query = query.Order(p.order.Field.toTerm(direction.OrderTermOption()))
	default:
		if len(query.ctx.Fields) > 0 {
			query.ctx.AppendFieldOnce(p.order.Field.column)
		}
	}
	return sql.ExprFunc(func(b *sql.Builder) {
		b.Ident(p.order.Field.column).Pad().WriteString(string(direction))
		if p.order.Field != DefaultUserOrder.Field {
			b.Comma().Ident(DefaultUserOrder.Field.column).Pad().WriteString(string(direction))
		}
	})
}

// Paginate executes the query and returns a relay based cursor connection to User.
func (u *UserQuery) Paginate(
	ctx context.Context, after *Cursor, first *int,
	before *Cursor, last *int, opts ...UserPaginateOption,
) (*UserConnection, error) {
	if err := validateFirstLast(first, last); err != nil {
		return nil, err
	}
	pager, err := newUserPager(opts, last != nil)
	if err != nil {
		return nil, err
	}
	if u, err = pager.applyFilter(u); err != nil {
		return nil, err
	}
	conn := &UserConnection{Edges: []*UserEdge{}}
	ignoredEdges := !hasCollectedField(ctx, edgesField)
	if hasCollectedField(ctx, totalCountField) || hasCollectedField(ctx, pageInfoField) {
		hasPagination := after != nil || first != nil || before != nil || last != nil
		if hasPagination || ignoredEdges {
			if conn.TotalCount, err = u.Clone().Count(ctx); err != nil {
				return nil, err
			}
			conn.PageInfo.HasNextPage = first != nil && conn.TotalCount > 0
			conn.PageInfo.HasPreviousPage = last != nil && conn.TotalCount > 0
		}
	}
	if ignoredEdges || (first != nil && *first == 0) || (last != nil && *last == 0) {
		return conn, nil
	}
	if u, err = pager.applyCursors(u, after, before); err != nil {
		return nil, err
	}
	if limit := paginateLimit(first, last); limit != 0 {
		u.Limit(limit)
	}
	if field := collectedField(ctx, edgesField, nodeField); field != nil {
		if err := u.collectField(ctx, graphql.GetOperationContext(ctx), *field, []string{edgesField, nodeField}); err != nil {
			return nil, err
		}
	}
	u = pager.applyOrder(u)
	nodes, err := u.All(ctx)
	if err != nil {
		return nil, err
	}
	conn.build(nodes, pager, after, first, before, last)
	return conn, nil
}

var (
	// UserOrderFieldGroupsCount orders by GROUPS_COUNT.
	UserOrderFieldGroupsCount = &UserOrderField{
		Value: func(u *User) (ent.Value, error) {
			return u.Value("groups_count")
		},
		column: "groups_count",
		toTerm: func(opts ...sql.OrderTermOption) user.OrderOption {
			return user.ByGroupsCount(
				append(opts, sql.OrderSelectAs("groups_count"))...,
			)
		},
		toCursor: func(u *User) Cursor {
			cv, _ := u.Value("groups_count")
			return Cursor{
				ID:    u.ID,
				Value: cv,
			}
		},
	}
)

// String implement fmt.Stringer interface.
func (f UserOrderField) String() string {
	var str string
	switch f.column {
	case UserOrderFieldGroupsCount.column:
		str = "GROUPS_COUNT"
	}
	return str
}

// MarshalGQL implements graphql.Marshaler interface.
func (f UserOrderField) MarshalGQL(w io.Writer) {
	io.WriteString(w, strconv.Quote(f.String()))
}

// UnmarshalGQL implements graphql.Unmarshaler interface.
func (f *UserOrderField) UnmarshalGQL(v interface{}) error {
	str, ok := v.(string)
	if !ok {
		return fmt.Errorf("UserOrderField %T must be a string", v)
	}
	switch str {
	case "GROUPS_COUNT":
		*f = *UserOrderFieldGroupsCount
	default:
		return fmt.Errorf("%s is not a valid UserOrderField", str)
	}
	return nil
}

// UserOrderField defines the ordering field of User.
type UserOrderField struct {
	// Value extracts the ordering value from the given User.
	Value    func(*User) (ent.Value, error)
	column   string // field or computed.
	toTerm   func(...sql.OrderTermOption) user.OrderOption
	toCursor func(*User) Cursor
}

// UserOrder defines the ordering of User.
type UserOrder struct {
	Direction OrderDirection  `json:"direction"`
	Field     *UserOrderField `json:"field"`
}

// DefaultUserOrder is the default ordering of User.
var DefaultUserOrder = &UserOrder{
	Direction: entgql.OrderDirectionAsc,
	Field: &UserOrderField{
		Value: func(u *User) (ent.Value, error) {
			return u.ID, nil
		},
		column: user.FieldID,
		toTerm: user.ByID,
		toCursor: func(u *User) Cursor {
			return Cursor{ID: u.ID}
		},
	},
}

// ToEdge converts User into UserEdge.
func (u *User) ToEdge(order *UserOrder) *UserEdge {
	if order == nil {
		order = DefaultUserOrder
	}
	return &UserEdge{
		Node:   u,
		Cursor: order.Field.toCursor(u),
	}
}