Use DeploymentSerializer to create deployment json

app/controllers/projects/deployments_controller.rb

@@ -2,8 +2,9 @@ class Projects::DeploymentsController < Projects::ApplicationController
   before_action :authorize_read_deployment!
 
   def index
+    serializer = DeploymentSerializer.new(user: @current_user)
     deployments = environment.deployments.where('created_at > ?', 8.hours.ago)
-                    .map { |d| d.slice(:id, :iid, :created_at, :sha, :ref, :tag) }
+                    .map { |d| serializer.represent(d) }
 
     render json: { deployments: deployments }
   end

app/serializers/deployment_entity.rb

@@ -18,6 +18,7 @@ class DeploymentEntity < Grape::Entity
     end
   end
 
+  expose :created_at
   expose :tag
   expose :last?
   expose :user, using: UserEntity

app/serializers/deployment_serializer.rb

@@ -0,0 +1,3 @@
+class DeploymentSerializer < BaseSerializer
+  entity DeploymentEntity
+end

spec/controllers/projects/deployments_controller_spec.rb

@@ -28,19 +28,16 @@ describe Projects::DeploymentsController do
     end
 
     it 'returns a list with deployments information' do
-      deployment = create(:deployment, environment: environment)
+      create(:deployment, environment: environment)
 
       get :index, environment_params
       expect(response).to be_ok
 
       deployments = json_response['deployments']
       deployment_info = deployments.first.with_indifferent_access
-      created_at = deployment_info.delete(:created_at).to_time.utc
 
       expect(deployments.count).to eq(1)
-      expect(deployment_info).to include(:id, :iid, :sha, :ref, :tag)
-      expect(deployment).to have_attributes(deployment_info)
-      expect(deployment.created_at).to be_within(1.second).of(created_at)
+      expect(deployment_info).to include(:id, :iid, :sha, :ref, :tag, :created_at)
     end
   end
 

spec/serializers/deployment_entity_spec.rb

@@ -24,4 +24,8 @@ describe DeploymentEntity do
     expect(subject[:ref][:name]).to eq 'master'
     expect(subject[:ref][:ref_path]).not_to be_empty
   end
+
+  it 'exposes creation date' do
+    expect(subject).to include(:created_at)
+  end
 end