'int', 'recipe_id' => 'int', 'user_id' => 'int', ]; public static function init_table() { $result = db_query('CREATE TABLE ' . static::$table_name . ' ( id INT AUTO_INCREMENT PRIMARY KEY, recipe_id INT NOT NULL, user_id INT NOT NULL, FOREIGN KEY (recipe_id) REFERENCES recipes(id) ON DELETE CASCADE, FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE );'); return $result; } public function valid() { $recipe = RecipeModel::get(array( [ 'name' => 'obj.id', 'type' => '=', 'value' => $this->field_recipe_id ] )); if(!$recipe) return ['Recipe does not exist']; return true; } }