repair database query

lib/docker_client.rb

@@ -73,6 +73,8 @@ class DockerClient
     # Headers are required by Docker
     headers = {'Origin' => 'http://localhost'}
 
+
+    # rspec error: undefined method `+' for nil:NilClass. problem with ws_host?
     socket = Faye::WebSocket::Client.new(DockerClient.config['ws_host'] + '/containers/' + @container.id + '/attach/ws?' + query_params, [], :headers => headers)
 
     socket.on :error do |event|

spec/policies/exercise_policy_spec.rb

@@ -109,7 +109,7 @@ let(:exercise) { FactoryGirl.build(:dummy) }
         end
 
         it "does not include other authors' non-public exercises" do
-          expect(scope.map(&:id)).not_to include(*Exercise.where(public: false).where(user_id <> #{@teacher.id}").map(&:id))
+          expect(scope.map(&:id)).not_to include(*Exercise.where(public: false).where("user_id <> #{@teacher.id}").map(&:id))
         end
       end
     end