posts_controller.js

Scvrush.PostsController = Em.ArrayController.extend({
  query: null,

  queryChanged: function(value) {
    var posts;

    if (this.get("query") === "") {
      posts = Scvrush.get("store").find(Scvrush.Post);
    } else {
      posts = Scvrush.get("store").find(Scvrush.Post, { query: this.get("query") });
    }

    this.set("content", posts);

    console.log(this.get("query"));
  }.observes("query")

});