DS#belongsTo()

DS.belongsTo is used to define One-To-One and One-To-Many relationships on a DS.Model.

DS.belongsTo takes an optional hash as a second parameter, currently supported options are:

• async: A boolean value used to explicitly declare this to be an async relationship.
• inverse: A string used to identify the inverse property on a related model in a One-To-Many relationship. See Explicit Inverses

One-To-One

To declare a one-to-one relationship between two models, use DS.belongsTo:

import DS from 'ember-data';

export default DS.Model.extend({
  profile: DS.belongsTo('profile')
});

import DS from 'ember-data';

export default DS.Model.extend({
  user: DS.belongsTo('user')
});

One-To-Many

To declare a one-to-many relationship between two models, use DS.belongsTo in combination with DS.hasMany, like this:

import DS from 'ember-data';

export default DS.Model.extend({
  comments: DS.hasMany('comment')
});

import DS from 'ember-data';

export default DS.Model.extend({
  post: DS.belongsTo('post')
});

You can avoid passing a string as the first parameter. In that case Ember Data will infer the type from the key name.

import DS from 'ember-data';

export default DS.Model.extend({
  post: DS.belongsTo()
});

will lookup for a Post type.