SqlAlchemy and Flask, how to query many-to-many relationship
The semantic of the relationship doesn't look right. I think it should be something like:
class Restaurant(db.Model): ... dishes = db.relationship('Dish', secondary=restaurant_dish, backref=db.backref('restaurants'))Then, to retrieve all the dishes for a restaurant, you can do:
x = Dish.query.filter(Dish.restaurants.any(name=name)).all()This should generate a query like:
SELECT dish.*FROM dishWHERE EXISTS ( SELECT 1 FROM restaurant_dish WHERE dish.id = restaurant_dish.dish_id AND EXISTS ( SELECT 1 FROM restaurant WHERE restaurant_dish.restaurant_id = restaurant.id AND restaurant.name = :name ) )