How can I define model relation in common Mixins?

[Emiya0306]

I need to define relation between models which use Mixins, but when I console.log(app.models.role), I cannot get the Model. It is a good work flow that Mixins is happened under the ModelBuilder, but I guess that Mixins is defined before the ModelBuilder.

So how can I get the ModelBuilder in mixins?

module.exports = function (Model, option = {}) {

  Model.getApp((err, app) => {

    console.log(app.models.role); // it is undefined

    //Model.hasMany(app.models.role, {as: 'roles', foreignKey: `${Model.modelName}Id`});

    Model.role = function (role, cb) {

      app.models.role.create(role).then((createdRole) => { // it can get in remote method

        cb(null, createdRole);

        console.log(Model.modelName);

      }).then(()=>{

      }).catch((err)=> {

        cb(err, null);

      })

    };

    Model.remoteMethod(
      'role', {
        description: 'Create a role for this Model.',
        http: {path: '/authorization/role', verb: 'post'},
        accepts: {arg: 'role', type: 'role', http: {source: 'body'}},
        returns: {arg: 'role', type: 'role'}
      }
    );

  })

};

[Emiya0306]

I found the resolution about this. Use Model 'attached' Event to do this.

app.dataSources['YourDatabaseName'].modelBuilder.models.role.on('attached', function(){
  Model.hasMany(app.models.role, {as: 'roles', foreignKey: `${Model.modelName}Id`});
});