tabel user

internal/store/snippet_store.go

@@ -50,6 +50,31 @@ func (s *SnippetStore) GetByID(ctx context.Context, id string) (*models.Snippet,
 	return &sn, nil
 }
 
+func (s *SnippetStore) GetByUserID(ctx context.Context, userID string) ([]*models.Snippet, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	query := `SELECT id, title, content, user_id FROM snippets WHERE user_id = $1`
+	rows, err := s.conn.Query(ctx, query, userID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	snippets := make([]*models.Snippet, 0)
+	for rows.Next() {
+		var sn models.Snippet
+		if err := rows.Scan(&sn.ID, &sn.Title, &sn.Content, &sn.UserID); err != nil {
+			return nil, err
+		}
+		snippets = append(snippets, &sn)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return snippets, nil
+}
+
 func (s *SnippetStore) GetAll(ctx context.Context) ([]*models.Snippet, error) {
 	s.mu.Lock()
 	defer s.mu.Unlock()

internal/store/user_store.go

@@ -2,13 +2,18 @@ package store
 
 import (
 	"context"
+	"errors"
 	"sync"
 
 	"5803025020/w04/internal/models"
 	"github.com/google/uuid"
 	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgconn"
 )
 
+// ErrUsernameTaken dikembalikan saat Create() gagal karena username sudah dipakai (unique constraint).
+var ErrUsernameTaken = errors.New("username already exists")
+
 type UserStore struct {
 	conn *pgx.Conn
 	mu   *sync.Mutex
@@ -34,7 +39,14 @@ func (s *UserStore) Create(ctx context.Context, user *models.User) error {
 
 	query := `INSERT INTO users (id, username, password_hash) VALUES ($1, $2, $3)`
 	_, err := s.conn.Exec(ctx, query, user.ID, user.Username, user.PasswordHash)
-	return err
+	if err != nil {
+		var pgErr *pgconn.PgError
+		if errors.As(err, &pgErr) && pgErr.Code == "23505" {
+			return ErrUsernameTaken
+		}
+		return err
+	}
+	return nil
 }
 
 func (s *UserStore) GetByUsername(ctx context.Context, username string) (*models.User, error) {