Mapping a uni-directional 1:M

Question

I have a a uni-directional 1:M.

A User can have many Carts. Before getting into a debate about ah this should be bidirectional, just assume I have to make uni-directional.

class User {
}

class Cart {
    static belongsTo = [user: User]
    static mapping = {
         user joinTable: [name: 'cart_user']
    }
}

I get:

org.hibernate.HibernateException: Missing column: user_id

Any ideas?

Answer 1

You are missing static hasMany = [carts:Cart]?

So try this (uni-directional):

class User {
    static hasMany = [carts:Cart]
}

class Cart {
     static belongsTo = [user: User]
}

update: To make it bidirectional

class User {
        static hasMany = [carts:Cart]
    }

    class Cart {
         User user
         static belongsTo = [user: User]
    }