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monthly_payment.go
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/
monthly_payment.go
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package pg
import (
"context"
"time"
"github.com/go-pg/pg/v10"
"github.com/pkg/errors"
common "github.com/ShoshinNikita/budget-manager/internal/db"
"github.com/ShoshinNikita/budget-manager/internal/pkg/money"
)
// MonthlyPayment represents monthly payment entity in PostgreSQL db
type MonthlyPayment struct {
tableName struct{} `pg:"monthly_payments"`
ID uint `pg:"id,pk"`
// MonthID is a foreign key to 'months' table
MonthID uint `pg:"month_id"`
Title string `pg:"title"`
TypeID uint `pg:"type_id"`
Type *SpendType `pg:"rel:has-one,fk:type_id"`
Notes string `pg:"notes"`
Cost money.Money `pg:"cost"`
}
// ToCommon converts MonthlyPayment to common MonthlyPayment structure from
// "github.com/ShoshinNikita/budget-manager/internal/db" package
func (mp MonthlyPayment) ToCommon(year int, month time.Month) common.MonthlyPayment {
return common.MonthlyPayment{
ID: mp.ID,
Year: year,
Month: month,
Title: mp.Title,
Type: mp.Type.ToCommon(),
Notes: mp.Notes,
Cost: mp.Cost,
}
}
// AddMonthlyPayment adds new Monthly Payment
func (db DB) AddMonthlyPayment(ctx context.Context, args common.AddMonthlyPaymentArgs) (id uint, err error) {
if !db.checkMonth(ctx, args.MonthID) {
return 0, common.ErrMonthNotExist
}
err = db.db.RunInTransaction(ctx, func(tx *pg.Tx) error {
mp := &MonthlyPayment{
MonthID: args.MonthID,
Title: args.Title,
Notes: args.Notes,
TypeID: args.TypeID,
Cost: args.Cost,
}
if _, err := tx.ModelContext(ctx, mp).Returning("id").Insert(); err != nil {
return err
}
id = mp.ID
return db.recomputeAndUpdateMonth(tx, args.MonthID)
})
if err != nil {
return 0, err
}
return id, nil
}
// EditMonthlyPayment modifies existing Monthly Payment
func (db DB) EditMonthlyPayment(ctx context.Context, args common.EditMonthlyPaymentArgs) error {
if !db.checkMonthlyPayment(ctx, args.ID) {
return common.ErrMonthlyPaymentNotExist
}
return db.db.RunInTransaction(ctx, func(tx *pg.Tx) error {
monthID, err := db.selectMonthlyPaymentMonthID(tx, args.ID)
if err != nil {
return err
}
query := tx.ModelContext(ctx, (*MonthlyPayment)(nil)).Where("id = ?", args.ID)
if args.Title != nil {
query = query.Set("title = ?", *args.Title)
}
if args.TypeID != nil {
if *args.TypeID == 0 {
query = query.Set("type_id = NULL")
} else {
query = query.Set("type_id = ?", *args.TypeID)
}
}
if args.Notes != nil {
query = query.Set("notes = ?", *args.Notes)
}
if args.Cost != nil {
query = query.Set("cost = ?", *args.Cost)
}
if _, err := query.Update(); err != nil {
return err
}
if args.Cost != nil {
// Recompute month only when cost has been changed
return db.recomputeAndUpdateMonth(tx, monthID)
}
return nil
})
}
// RemoveMonthlyPayment removes Monthly Payment with passed id
func (db DB) RemoveMonthlyPayment(ctx context.Context, id uint) error {
if !db.checkMonthlyPayment(ctx, id) {
return common.ErrMonthlyPaymentNotExist
}
return db.db.RunInTransaction(ctx, func(tx *pg.Tx) error {
monthID, err := db.selectMonthlyPaymentMonthID(tx, id)
if err != nil {
return err
}
_, err = tx.ModelContext(ctx, (*MonthlyPayment)(nil)).Where("id = ?", id).Delete()
if err != nil {
return err
}
return db.recomputeAndUpdateMonth(tx, monthID)
})
}
func (DB) selectMonthlyPaymentMonthID(tx *pg.Tx, id uint) (monthID uint, err error) {
ctx := tx.Context()
err = tx.ModelContext(ctx, (*MonthlyPayment)(nil)).Column("month_id").Where("id = ?", id).Select(&monthID)
if err != nil {
return 0, errors.Wrap(err, "couldn't select month id of Monthly Payment")
}
return monthID, nil
}