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|
package model
import (
"database/sql"
"errors"
"fmt"
)
type Ingredient struct {
Id string `json:"id"`
Index string `json:"index"`
Amount string `json:"amount"`
Unit string `json:"unit"`
Type string `json:"type"`
Step string `json:"step"`
}
func (i *Ingredient) Validate() error {
var err error
if i.Id != "" {
err = isPositiveOrZeroInt(i.Id)
if err != nil {
return fmt.Errorf("Invalid ingredient ID: %w", err)
}
}
err = isPositiveOrZeroInt(i.Index)
if err != nil {
return fmt.Errorf("Invalid ingredient index: %w", err)
}
if i.Amount != "" {
err = isPositiveOrZeroFloat(i.Amount)
if err != nil {
return fmt.Errorf("Invalid ingredient amount: %w", err)
}
}
err = isPositiveOrZeroInt(i.Step)
if err != nil {
return fmt.Errorf("Ingredient does not reference a valid step ID: %w", err)
}
return nil
}
func (i *Ingredient) Create(tx *sql.Tx) error {
if i.Id != "" {
return fmt.Errorf("Cannot create ingredient if ID is given")
}
err := i.Validate()
if err != nil {
return err
}
cmd := `
INSERT INTO ingredients
('index', amount, unit, 'type', step)
VALUES
(?, ?, ?, ?, ?)
`
result, err := tx.Exec(cmd, i.Index, i.Amount, i.Unit, i.Type, i.Step)
if err != nil {
return err
}
id, err := result.LastInsertId()
if err != nil {
return err
}
i.Id = fmt.Sprint(id)
return nil
}
func (i *Ingredient) Read(tx *sql.Tx) error {
cmd := `
SELECT
"index", amount, unit, "type", step
FROM
ingredients
WHERE
id = ?
`
rows, err := tx.Query(cmd, i.Id)
if err != nil {
return err
}
defer rows.Close()
if !rows.Next() {
return sql.ErrNoRows
}
err = rows.Scan(&i.Index, &i.Amount, &i.Unit, &i.Type, &i.Step)
if err != nil {
return err
}
return i.Validate()
}
func (i *Ingredient) Update(tx *sql.Tx) error {
err := i.Validate()
if err != nil {
return err
}
cmd := `
UPDATE
ingredients
SET
index = ?,
amount = ?,
unit = ?,
type = ?,
step = ?
WHERE
id = ?`
res, err := tx.Exec(cmd, i.Index, i.Amount, i.Unit, i.Type, i.Step, i.Id)
if err != nil {
return err
}
affected, err := res.RowsAffected()
if err != nil {
return err
}
if affected != 1 {
return fmt.Errorf("Ingredient update affected %d rows instead of 1", affected)
}
return nil
}
func (i *Ingredient) Delete(tx *sql.Tx) error {
cmd := `
DELETE FROM
ingredients
WHERE
id = ?
`
result, err := tx.Exec(cmd, i.Id)
if err != nil {
return err
}
rows, err := result.RowsAffected()
if rows != 1 {
return errors.New("Ingredient deletion did not affect exactly one row")
}
return nil
}
|
