Ember JS：设置从商店预先填充的控制器属性

I have a template that has drop down that I would like it to be pre-populated with data coming the API. I thought of setting a controller properties from the setupController hook the problem is the template seems to be rendered before the promise from the store.findAll() is resolve causing a bit of flicker. Is there a hook/pattern so everything is loaded before the template is rendered.?I have a template that has drop down that I wou