feat: added db transactions abstraction; cleaned up user registration; repos adapted new abstraction: all repos now support transactions, if present in ctx

internal/domain/list.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"errors"
 	"log/slog"
-	"slices"
 	"time"
 )
 
@@ -36,7 +35,7 @@ type ListItem struct {
 }
 
 type ListRepository interface {
-	CreateList(ctx context.Context, name string, userIDs []string) (*List, error)
+	CreateList(ctx context.Context, name string) (*List, error)
 	DeleteList(ctx context.Context, listID string) error
 	GetLists(ctx context.Context, userID string) ([]List, error)
 	AddUserToList(ctx context.Context, listID string, userID string) error
@@ -58,16 +57,22 @@ func NewListService(r ListRepository) *ListService {
 	return &ListService{repo: r}
 }
 
-func (s *ListService) CreateList(ctx context.Context, authUserID string, name string, userIDs []string) (*List, error) {
+func (s *ListService) CreateList(ctx context.Context, authUserID string, name string) (*List, error) {
 	if name == "" {
 		return nil, ErrListNameEmpty
 	}
 
-	if !slices.Contains(userIDs, authUserID) {
-		userIDs = append(userIDs, authUserID)
+	list, err := s.repo.CreateList(ctx, name)
+	if err != nil {
+		return nil, err
 	}
 
-	return s.repo.CreateList(ctx, name, userIDs)
+	err = s.repo.AddUserToList(ctx, list.ID, authUserID)
+	if err != nil {
+		return nil, err
+	}
+
+	return list, nil
 }
 
 func (s *ListService) DeleteList(ctx context.Context, authUserID string, listID string) error {