Add user activity system

ember/app/controllers/user/activity.js

@@ -0,0 +1,71 @@
+import Ember from 'ember';
+
+export default Ember.Controller.extend({
+  needs: ['user'],
+
+  queryParams: ['filter'],
+  filter: '',
+
+  resultsLoading: false,
+
+  moreResults: true,
+
+  loadCount: 10,
+
+  getResults: function(start) {
+    var type;
+    switch (this.get('filter')) {
+      case 'discussions':
+        type = 'discussion';
+        break;
+
+      case 'posts':
+        type = 'post';
+        break;
+    }
+    var controller = this;
+    return this.store.find('activity', {
+      users: this.get('controllers.user.model.id'),
+      type: type,
+      start: start,
+      count: this.get('loadCount')
+    }).then(function(results) {
+      controller.set('moreResults', results.get('length') >= controller.get('loadCount'));
+      return results;
+    });
+  },
+
+  paramsDidChange: Ember.observer('filter', function() {
+    if (this.get('model') && !this.get('resultsLoading')) {
+      Ember.run.once(this, this.loadResults);
+    }
+  }),
+
+  loadResults: function() {
+    this.send('loadResults');
+  },
+
+  actions: {
+    loadResults: function() {
+      var controller = this;
+      controller.get('model').set('content', []);
+      controller.set('resultsLoading', true);
+      controller.getResults().then(function(results) {
+        controller
+          .set('resultsLoading', false)
+          .set('meta', results.get('meta'))
+          .set('model.content', results);
+      });
+    },
+
+    loadMore: function() {
+      var controller = this;
+      this.set('resultsLoading', true);
+      this.getResults(this.get('model.length')).then(function(results) {
+        controller.get('model.content').addObjects(results);
+        controller.set('meta', results.get('meta'));
+        controller.set('resultsLoading', false);
+      });
+    },
+  }
+});