95 lines
2.1 KiB
Go
95 lines
2.1 KiB
Go
package units
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import (
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"context"
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"errors"
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"github.com/google/uuid"
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"github.com/jackc/pgx/v5/pgconn"
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"gorm.io/gorm"
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)
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var (
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ErrNotFound = errors.New("unit not found")
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ErrSymbolTaken = errors.New("symbol already in use")
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ErrInUse = errors.New("unit is referenced by existing price tiers")
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)
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type Repository interface {
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Create(ctx context.Context, u *Unit) error
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FindByID(ctx context.Context, id uuid.UUID) (*Unit, error)
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List(ctx context.Context) ([]*Unit, error)
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Update(ctx context.Context, u *Unit) error
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Delete(ctx context.Context, id uuid.UUID) error
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}
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type gormRepository struct {
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db *gorm.DB
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}
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func NewRepository(db *gorm.DB) Repository {
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return &gormRepository{db: db}
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}
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func (r *gormRepository) Create(ctx context.Context, u *Unit) error {
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if err := r.db.WithContext(ctx).Create(u).Error; err != nil {
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if isUniqueViolation(err) {
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return ErrSymbolTaken
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}
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return err
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}
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return nil
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}
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func (r *gormRepository) FindByID(ctx context.Context, id uuid.UUID) (*Unit, error) {
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var u Unit
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err := r.db.WithContext(ctx).Where("id = ?", id).First(&u).Error
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if errors.Is(err, gorm.ErrRecordNotFound) {
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return nil, ErrNotFound
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}
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if err != nil {
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return nil, err
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}
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return &u, nil
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}
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func (r *gormRepository) List(ctx context.Context) ([]*Unit, error) {
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var list []*Unit
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if err := r.db.WithContext(ctx).Order("name asc").Find(&list).Error; err != nil {
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return nil, err
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}
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return list, nil
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}
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func (r *gormRepository) Update(ctx context.Context, u *Unit) error {
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err := r.db.WithContext(ctx).Save(u).Error
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if isUniqueViolation(err) {
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return ErrSymbolTaken
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}
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return err
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}
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func (r *gormRepository) Delete(ctx context.Context, id uuid.UUID) error {
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res := r.db.WithContext(ctx).Delete(&Unit{}, "id = ?", id)
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if res.Error != nil {
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if isForeignKeyViolation(res.Error) {
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return ErrInUse
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}
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return res.Error
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}
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if res.RowsAffected == 0 {
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return ErrNotFound
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}
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return nil
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}
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func isUniqueViolation(err error) bool {
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var pgErr *pgconn.PgError
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return errors.As(err, &pgErr) && pgErr.Code == "23505"
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}
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func isForeignKeyViolation(err error) bool {
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var pgErr *pgconn.PgError
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return errors.As(err, &pgErr) && pgErr.Code == "23503"
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}
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