ember ajax idicator in model

I have some model in ember routing.

model() {
    return this.get('store').query('orders', {})
}

Also i have adapter, which work send ajax.

model:

export default DS.Model.extend({
    login:  DS.attr(),
    pass: DS.attr(),
    smsDisabled: DS.attr(),
    loader_btn: DS.attr(),
    me: DS.attr()

});

How change or add loader flag? How change indicator?

P.S. How to lead to this species:

 //how write it in template?
   <img src="ajax_loader.png" />