Handle promises properly

With API V3 we have some relationships (like lastBuild on branch)
specified as asynchronuous, so sometimes we may deal with promises. This
commit fixes the situation by handling both plain records and promises.

app/components/repo-actions.js

@@ -1,7 +1,5 @@
 import Ember from 'ember';
 
 export default Ember.Component.extend({
-
   classNames: ['repo-main-tools']
-
 });

app/controllers/repo.js

@@ -1,6 +1,7 @@
 import Ember from 'ember';
 import { githubRepo, statusImage } from 'travis/utils/urls';
 import config from 'travis/config/environment';
+import eventually from 'travis/utils/eventually';
 
 
 export default Ember.Controller.extend({
@@ -122,9 +123,12 @@ export default Ember.Controller.extend({
   },
 
   _lastBuildDidChange() {
-    var build;
-    build = this.get('repo.lastBuild');
-    return this.set('build', build);
+    let lastBuild = this.get('repo.lastBuild');
+    if(lastBuild) {
+      eventually(lastBuild, (build) => {
+        this.set('build', build);
+      });
+    }
   },
 
   stopObservingLastBuild() {

app/services/update-times.js

@@ -1,5 +1,6 @@
 import Ember from 'ember';
 import Config from 'travis/config/environment';
+import eventually from 'travis/utils/eventually';
 
 export default Ember.Service.extend({
   records: [],
@@ -28,7 +29,11 @@ export default Ember.Service.extend({
     records.filter((record) => {
       return this.get('allowFinishedBuilds') || !record.get('isFinished');
     }).forEach((record) => {
-      record.updateTimes();
+      eventually(record, function(resolvedRecord) {
+        if(resolvedRecord) {
+          resolvedRecord.updateTimes();
+        }
+      });
     });
 
     this.set('records', []);

app/utils/eventually.js

@@ -0,0 +1,9 @@
+export default function(anObjectOrAPromise, callback) {
+  if(anObjectOrAPromise.then) {
+    anObjectOrAPromise.then(function(result) {
+      callback(result);
+    });
+  } else {
+    callback(anObjectOrAPromise);
+  }
+}

app/utils/repo-actions-item-component-mixin.js

@@ -1,4 +1,5 @@
 import Ember from 'ember';
+import eventually from 'travis/utils/eventually';
 
 export default Ember.Mixin.create({
   restarting: false,
@@ -31,7 +32,12 @@ export default Ember.Mixin.create({
       onFinished = () => {
         this.set('restarting', false);
       };
-      return this.get('item').restart().then(onFinished, onFinished);
+      let restart = function(record) {
+        record.restart().then(onFinished, onFinished);
+      };
+      eventually(this.get('item'), (item) => {
+        item.restart();
+      });
     },
     cancel: function() {
       var type;

tests/unit/utils/eventually-test.js

@@ -0,0 +1,25 @@
+import Ember from 'ember';
+import eventually from 'travis/utils/eventually';
+
+module("eventually");
+
+test("eventually runs a callback with passed item right away if it's not a promise", function() {
+  stop();
+  expect(1);
+
+  eventually({ foo: 'bar' }, function(result) {
+    equal(result.foo, 'bar');
+    start();
+  });
+});
+
+test("eventually runs a callback when promise resolves if a passed object is a promise", function() {
+  stop();
+  expect(1);
+
+  let promise = { then: function(callback) { callback({ foo: 'bar'}); } };
+  eventually(promise, function(result) {
+    equal(result.foo, 'bar');
+    start();
+  });
+});