Within an Ember Model, how do I specify the name of an api's object's attribute when it's different from the attribute name of the Ember model?

I am trying to set up a hasMany relationship for my Style model (hasMany('color_style')), and from what I understand of the documentation, it looks for a style attribute on ColorStyle instances, but my api is sending the attribute style_id, not style. How do I tell the ColorStyle model to read the style_id attribute from the api into the style attribute of the local model (and to translate it back when sending requests)?

The JSON from the api:

{
    id:1,
    color_id:1,
    style_id:1,
    customer_id:1,
    active_flag:null,
    created_at:"2015-02-13T22:35:23.857Z",
    updated_at:"2015-02-13T22:35:23.857Z"
}

The Ember Model:

App.ColorStyle = DS.Model.extend({
    color:    DS.belongsTo('color'),    // should be tied to color_id from api
    style:    DS.belongsTo('style'),    // should be tied to style_id from api
    customer: DS.belongsTo('customer'), // should be tied to customer_id from api
    active_flag: DS.attr('boolean'),
    created_at:  DS.attr('date'),
    updated_at:  DS.attr('date')
});