Include repositoryId as an attribute on build

For some reason (probably some problem with one of the serializers) we
sometimes lack an id attribute for a promise that we get for a repo
relationship on build. Because of that doing `build.get('repo.id')` may
sometimes return undefined. A temporary workaround is to make sure that
we always can access the `repository_id` property.

app/models/build.coffee

@@ -19,6 +19,7 @@ Build = Model.extend DurationCalculations,
   pullRequestTitle:  DS.attr()
   pullRequestNumber: DS.attr('number')
   eventType:         DS.attr('string')
+  repositoryId:      DS.attr('number')
 
   repo:   DS.belongsTo('repo', async: true)
   commit: DS.belongsTo('commit')

app/models/repo.coffee

@@ -35,7 +35,7 @@ Repo = Model.extend
   builds: (->
     id = @get('id')
     builds = @store.filter('build', event_type: ['push', 'api'], repository_id: id, (b) ->
-      b.get('repo.id') == id && (b.get('eventType') == 'push' || b.get('eventType') == 'api')
+      b.get('repositoryId')+'' == id+'' && (b.get('eventType') == 'push' || b.get('eventType') == 'api')
     )
 
     # TODO: move to controller
@@ -52,7 +52,7 @@ Repo = Model.extend
   pullRequests: (->
     id = @get('id')
     builds = @store.filter('build', event_type: 'pull_request', repository_id: id, (b) ->
-      b.get('repo.id') == id && b.get('eventType') == 'pull_request'
+      b.get('repositoryId')+'' == id+'' && b.get('eventType') == 'pull_request'
     )
 
     # TODO: move to controller

app/serializers/build.coffee

@@ -16,4 +16,23 @@ Serializer = V2FallbackSerializer.extend
     else
       @_super.apply(this, arguments)
 
+   normalize: (modelClass, resourceHash) ->
+    result = @_super(modelClass, resourceHash)
+
+    data = result.data
+
+    # for some reasone repo's promise not always has its id set
+    # so we can't always do build.get('repo.id')
+    # this ensures that repositoryId is always reachable on build
+    # TODO: look into the real cause of the problem (maybe it will be gone
+    #       after fully switching to V3 and/or updating ember-data)
+    if repoId = resourceHash.repository_id
+      data.attributes.repositoryId = repoId
+    else if resourceHash.repository
+      if href = resourceHash.repository['@href']
+        id = href.match(/\d+/)[0]
+        data.attributes.repositoryId = id
+
+    return result
+
 `export default Serializer`