Updating MovieModel's method from internal/data/movies.go file. Create the updateMovieHandler function inside cmd/api/movies.go. Adding the route into routes.go to update a movie.

internal/data/movies.go

@@ -109,7 +109,24 @@ func (m MovieModel) Get(id int64) (*Movie, error) {
 
 // Update : Updating a specific record in the movies table
 func (m MovieModel) Update(movie *Movie) error {
-	return nil
+	// Declare the SQL query for updating the record and returning the new version number.
+	query := `
+		UPDATE movies
+		SET title = $1, year = $2, runtime = $3, genres = $4, version = version +1
+		WHERE id = $5
+		RETURNING version`
+
+	// Create an args slice containing the values for the placeholder parameters.
+	args := []any{
+		movie.Title,
+		movie.Year,
+		movie.Runtime,
+		pq.Array(movie.Genres),
+		movie.ID,
+	}
+
+	// Use the QueryRow() method to execute the query, passing in the args slice as a variadic parameter and scanning the new version value into the movie struct.
+	return m.DB.QueryRow(query, args...).Scan(&movie.Version)
 }
 
 // Delete : Deleting a specific record from the movies table