共享相同主键名称的遗留表的 Grails 域映射

Question

The legacy database has two tables that use the same column name as the primary key. For example:

user:
user_id int
name string

user_profile:
user_id int
visit_count int

I would like to create a bidirectional one-to-one relationship. ie

class User {
    String name
    UserProfile userProfile
    static mapping = {
        id column: 'user_id'
    }
}

class UserProfile {
    Integer visitCount
    User user
    static mapping = {
        id column: 'user_id'
    }
}

I would like to be able to reference 'user.userProfile.visitCount' or 'userProfile.user.name'.

I have tried many combinations of direct references and relationship discriptors, 'hasOne', 'belongsTo', etc. I would think this is simple but cannot find the right syntax. I get duplicate column issues or missing column name issues. Any help would be appreciated. Thanks in advance.

Answer 1

The User in UserProfile would default to user_id which is the same as the id column for UserProfile. So just add a column name for the user reference like below.

class UserProfile {
    Integer visitCount
    User user

    static mapping = {
        id column: 'user_id'
        user column: 'useruser_id'
    }
}

class User {
    String name

    static mapping = {
        id column: 'user_id'
    }

    static hasOne = [ userProfile: UserProfile ]
}