Начальная версияv0.0.1

1 files changed, 87 insertions, 0 deletions

diff --git a/pkg/service/crud/crud.go b/pkg/service/crud/crud.go
new file mode 100644
index 0000000..799eacb
--- /dev/null
+++ b/pkg/service/crud/crud.go
@@ -0,0 +1,87 @@
+package crud
+
+import (
+	"context"
+	"errors"
+
+	"github.com/uptrace/bun"
+	"github.com/uptrace/bun/driver/pgdriver"
+)
+
+var ErrRecordAlreadyExists = errors.New("record already exists")
+
+type Service[T any] struct {
+	db *bun.DB
+}
+
+func NewService[T any](db *bun.DB) *Service[T] {
+	return &Service[T]{
+		db: db,
+	}
+}
+
+func (s *Service[T]) Insert(ctx context.Context, model *T) error {
+	if _, err := s.db.NewInsert().Model(model).Returning("*").Exec(ctx); err != nil {
+		pqErr := pgdriver.Error{}
+		if errors.As(err, &pqErr) {
+			if pqErr.Field('C') == "23505" {
+				return ErrRecordAlreadyExists
+			}
+		}
+
+		return err
+	}
+
+	return nil
+}
+
+func (s *Service[T]) UpdatePk(ctx context.Context, model *T, columns []string) error {
+	if _, err := s.db.NewUpdate().Model(model).WherePK(columns...).Column(columns...).Exec(ctx); err != nil {
+		pqErr := pgdriver.Error{}
+		if errors.As(err, &pqErr) {
+			if pqErr.Field('C') == "23505" {
+				return ErrRecordAlreadyExists
+			}
+		}
+
+		return err
+	}
+
+	return nil
+}
+
+//nolint:revive
+func (s *Service[T]) Update(ctx context.Context, model *T, columns []string, query string, args ...any) error {
+	if _, err := s.db.NewUpdate().Model(model).Where(query, args...).Column(columns...).Exec(ctx); err != nil {
+		pqErr := pgdriver.Error{}
+		if errors.As(err, &pqErr) {
+			if pqErr.Field('C') == "23505" {
+				return ErrRecordAlreadyExists
+			}
+		}
+
+		return err
+	}
+
+	return nil
+}
+
+func (s *Service[T]) FindOne(ctx context.Context, query string, args ...any) (*T, error) {
+	m := new(T)
+
+	return m, s.db.NewSelect().Model(m).Where(query, args...).Scan(ctx, m)
+}
+
+//nolint:revive
+func (s *Service[T]) Find(ctx context.Context, query string, args ...any) ([]T, int, error) {
+	m := make([]T, 0)
+	c, err := s.db.NewSelect().Model(m).Where(query, args...).ScanAndCount(ctx, &m)
+
+	return m, c, err
+}
+
+func (s *Service[T]) Delete(ctx context.Context, query string, args ...any) error {
+	_, err := s.db.NewDelete().Model((*T)(nil)).Where(query, args...).Exec(ctx)
+
+	return err
+}