ch7.4

internal/data/movies.go

@@ -67,7 +67,21 @@ func (m MovieModel) Get(id int64) (*Movie, error) {
 }
 
 func (m MovieModel) Update(movie *Movie) error {
-	return nil
+	query := `
+		UPDATE movies
+		SET title=$1, year=$2, runtime=$3, genres=$4, version = version + 1
+		WHERE id = $5
+		RETURNING version`
+
+	args := []any{
+		movie.Title,
+		movie.Year,
+		movie.Runtime,
+		pq.Array(movie.Genres),
+		movie.ID,
+	}
+
+	return m.DB.QueryRow(query, args...).Scan(&movie.Version)
 }
 
 func (m MovieModel) Delete(id int64) error {