Reduce the amount of data deployment endpoint returns

app/serializers/deployment_entity.rb

@@ -9,20 +9,9 @@ class DeploymentEntity < Grape::Entity
     expose :name do |deployment|
       deployment.ref
     end
-
-    expose :ref_path do |deployment|
-      namespace_project_tree_path(
-        deployment.project.namespace,
-        deployment.project,
-        id: deployment.ref)
-    end
   end
 
   expose :created_at
   expose :tag
   expose :last?
-  expose :user, using: UserEntity
-  expose :commit, using: CommitEntity
-  expose :deployable, using: BuildEntity
-  expose :manual_actions, using: BuildEntity
 end

app/serializers/deployment_entity_detailed.rb

@@ -0,0 +1,28 @@
+class DeploymentEntityDetailed < Grape::Entity
+  include RequestAwareEntity
+
+  expose :id
+  expose :iid
+  expose :sha
+
+  expose :ref do
+    expose :name do |deployment|
+      deployment.ref
+    end
+
+    expose :ref_path do |deployment|
+      namespace_project_tree_path(
+        deployment.project.namespace,
+        deployment.project,
+        id: deployment.ref)
+    end
+  end
+
+  expose :created_at
+  expose :tag
+  expose :last?
+  expose :user, using: UserEntity
+  expose :commit, using: CommitEntity
+  expose :deployable, using: BuildEntity
+  expose :manual_actions, using: BuildEntity
+end

app/serializers/environment_entity.rb

@@ -6,7 +6,7 @@ class EnvironmentEntity < Grape::Entity
   expose :state
   expose :external_url
   expose :environment_type
-  expose :last_deployment, using: DeploymentEntity
+  expose :last_deployment, using: DeploymentEntityDetailed
   expose :stop_action?
 
   expose :metrics_path, if: -> (environment, _) { environment.has_metrics? } do |environment|

spec/serializers/deployment_entity_spec.rb

@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-describe DeploymentEntity do
+describe DeploymentEntityDetailed do
   let(:user) { create(:user) }
   let(:request) { double('request') }