I have such database with relationship many2many
association_table = db.Table('association',
db.Column('meal_id', db.Integer, db.ForeignKey('meals.id')),
db.Column('order_id', db.Integer, db.ForeignKey('orders.id'))
)
class Order(db.Model):
__tablename__ = 'orders'
id = db.Column(db.Integer, primary_key=True)
data = db.Column(db.String)
meals = db.relationship(
"Meals", secondary=association_table, back_populates="orders"
)
class Meals(db.Model):
__tablename__ = 'meals'
id = db.Column(db.Integer, primary_key=True)
title = db.Column(db.String, unique=True)
price = db.Column(db.Float)
orders = db.relationship(
"Order", secondary=association_table, back_populates="meals"
)
I try to insert data to table Order
order_to_database = Order (data='05_03_2021',
meals = 1
)
db.session.add(order_to_database)
db.session.commit()
meals is id of meals. I go th error:
How should I solve this problem?
When using db.relationship
ORM expects meals
should be an Instance of Meals
, not an integer.
breakfast_meal = Meal(id=1,title='Lunch',price=9)
order_to_database = Order(data='05_03_2021')
order_to_database.meals.append(breakfast_meal)
db.session.add(order_to_database)
db.session.commit()
If you are using already existing meal from database you can do:
lunch_meal = Meal.query.filter(Meal.id==10).first()
....
order_to_database.meals.append(lunch_meal)
....
db.session.commit()