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model_table_struct.go
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/
model_table_struct.go
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package orm
import (
"errors"
"fmt"
"reflect"
"strings"
)
type structTableModel struct {
table *Table
rel *Relation
joins []join
root reflect.Value
index []int
strct reflect.Value
}
var _ tableModel = (*structTableModel)(nil)
func newStructTableModel(v interface{}) (*structTableModel, error) {
switch v := v.(type) {
case *structTableModel:
return v, nil
case reflect.Value:
return newStructTableModelValue(v)
default:
return newStructTableModelValue(reflect.ValueOf(v))
}
}
func newStructTableModelValue(v reflect.Value) (*structTableModel, error) {
if !v.IsValid() {
return nil, errors.New("pg: Model(nil)")
}
v = reflect.Indirect(v)
if v.Kind() != reflect.Struct {
return nil, fmt.Errorf("pg: Model(unsupported %s)", v.Type())
}
return &structTableModel{
table: Tables.Get(v.Type()),
root: v,
strct: v,
}, nil
}
func (structTableModel) useQueryOne() bool {
return true
}
func (m *structTableModel) Table() *Table {
return m.table
}
func (m *structTableModel) Relation() *Relation {
return m.rel
}
func (m *structTableModel) AppendParam(dst []byte, name string) ([]byte, bool) {
dst, ok := m.table.AppendParam(dst, m.strct, name)
if ok {
return dst, true
}
switch name {
case "TableAlias":
dst = append(dst, m.table.Alias...)
return dst, true
}
return dst, false
}
func (m *structTableModel) Root() reflect.Value {
return m.root
}
func (m *structTableModel) Index() []int {
return m.index
}
func (m *structTableModel) ParentIndex() []int {
return m.index[:len(m.index)-len(m.rel.Field.Index)]
}
func (m *structTableModel) Value() reflect.Value {
return m.strct
}
func (m *structTableModel) Bind(bind reflect.Value) {
m.strct = bind.FieldByIndex(m.rel.Field.Index)
}
func (m *structTableModel) initStruct(bindChildren bool) {
if m.strct.Kind() == reflect.Interface {
m.strct = m.strct.Elem()
}
if m.strct.Kind() == reflect.Ptr {
if m.strct.IsNil() {
m.strct.Set(reflect.New(m.strct.Type().Elem()))
m.strct = m.strct.Elem()
bindChildren = true
} else {
m.strct = m.strct.Elem()
}
}
if bindChildren {
m.bindChildren()
}
}
func (m *structTableModel) bindChildren() {
for i := range m.joins {
j := &m.joins[i]
switch j.Rel.Type {
case HasOneRelation, BelongsToRelation:
j.JoinModel.Bind(m.strct)
}
}
}
func (structTableModel) Reset() error {
return nil
}
func (m *structTableModel) NewModel() ColumnScanner {
m.initStruct(true)
return m
}
func (m *structTableModel) AddModel(_ ColumnScanner) error {
return nil
}
func (m *structTableModel) AfterQuery(db DB) error {
if !m.table.Has(AfterQueryHookFlag) {
return nil
}
return callAfterQueryHook(m.strct.Addr(), db)
}
func (m *structTableModel) AfterSelect(db DB) error {
if !m.table.Has(AfterSelectHookFlag) {
return nil
}
return callAfterSelectHook(m.strct.Addr(), db)
}
func (m *structTableModel) BeforeInsert(db DB) error {
if !m.table.Has(BeforeInsertHookFlag) {
return nil
}
return callBeforeInsertHook(m.strct.Addr(), db)
}
func (m *structTableModel) AfterInsert(db DB) error {
if !m.table.Has(AfterInsertHookFlag) {
return nil
}
return callAfterInsertHook(m.strct.Addr(), db)
}
func (m *structTableModel) BeforeUpdate(db DB) error {
if !m.table.Has(BeforeUpdateHookFlag) {
return nil
}
return callBeforeUpdateHook(m.strct.Addr(), db)
}
func (m *structTableModel) AfterUpdate(db DB) error {
if !m.table.Has(AfterUpdateHookFlag) {
return nil
}
return callAfterUpdateHook(m.strct.Addr(), db)
}
func (m *structTableModel) BeforeDelete(db DB) error {
if !m.table.Has(BeforeDeleteHookFlag) {
return nil
}
return callBeforeDeleteHook(m.strct.Addr(), db)
}
func (m *structTableModel) AfterDelete(db DB) error {
if !m.table.Has(AfterDeleteHookFlag) {
return nil
}
return callAfterDeleteHook(m.strct.Addr(), db)
}
func (m *structTableModel) ScanColumn(colIdx int, colName string, b []byte) error {
ok, err := m.scanColumn(colIdx, colName, b)
if ok {
return err
}
return fmt.Errorf("pg: can't find column=%s in model=%s", colName, m.table.Type.Name())
}
func (m *structTableModel) scanColumn(colIdx int, colName string, b []byte) (bool, error) {
joinName, fieldName := splitColumn(colName)
if joinName != "" {
if join := m.GetJoin(joinName); join != nil {
return join.JoinModel.scanColumn(colIdx, fieldName, b)
}
if m.table.ModelName == joinName {
return m.scanColumn(colIdx, fieldName, b)
}
}
field, ok := m.table.FieldsMap[colName]
if !ok {
return false, nil
}
m.initStruct(false)
return true, field.ScanValue(m.strct, b)
}
func (m *structTableModel) GetJoin(name string) *join {
for i := range m.joins {
j := &m.joins[i]
if j.Rel.Field.GoName == name || j.Rel.Field.SQLName == name {
return j
}
}
return nil
}
func (m *structTableModel) GetJoins() []join {
return m.joins
}
func (m *structTableModel) AddJoin(j join) *join {
m.joins = append(m.joins, j)
return &m.joins[len(m.joins)-1]
}
func (m *structTableModel) Join(name string, apply func(*Query) (*Query, error)) (bool, *join) {
return m.join(m.Value(), name, apply)
}
func (m *structTableModel) join(
bind reflect.Value, name string, apply func(*Query) (*Query, error),
) (bool, *join) {
path := strings.Split(name, ".")
index := make([]int, 0, len(path))
currJoin := join{
BaseModel: m,
JoinModel: m,
}
var created bool
var lastJoin *join
var hasColumnName bool
for _, name := range path {
rel, ok := currJoin.JoinModel.Table().Relations[name]
if !ok {
hasColumnName = true
break
}
currJoin.Rel = rel
index = append(index, rel.Field.Index...)
if j := currJoin.JoinModel.GetJoin(name); j != nil {
currJoin.BaseModel = j.BaseModel
currJoin.JoinModel = j.JoinModel
created = false
lastJoin = j
} else {
model, err := newTableModelIndex(bind, index, rel)
if err != nil {
return false, nil
}
currJoin.Parent = lastJoin
currJoin.BaseModel = currJoin.JoinModel
currJoin.JoinModel = model
created = true
lastJoin = currJoin.BaseModel.AddJoin(currJoin)
}
}
// No joins with such name.
if lastJoin == nil {
return false, nil
}
if apply != nil {
lastJoin.ApplyQuery = apply
}
if hasColumnName {
column := path[len(path)-1]
if column == "_" {
if lastJoin.Columns == nil {
lastJoin.Columns = make([]string, 0)
}
} else {
lastJoin.Columns = append(lastJoin.Columns, column)
}
}
return created, lastJoin
}
func splitColumn(s string) (string, string) {
ind := strings.Index(s, "__")
if ind == -1 {
return "", s
}
return s[:ind], s[ind+2:]
}