Do not serialize deployment details for build details page

app/serializers/build_details_entity.rb

@@ -14,7 +14,7 @@ class BuildDetailsEntity < JobEntity
   expose :deployment_status, if: -> (*) { build.starts_environment? } do
     expose :deployment_status, as: :status
     expose :persisted_environment, as: :environment do |build, options|
-      options.merge(except: [{ last_deployment: [:commit] }]).yield_self do |opts|
+      options.merge(deployment_details: false).yield_self do |opts|
         EnvironmentEntity.represent(build.persisted_environment, opts)
       end
     end

app/serializers/deployment_entity.rb

@@ -20,15 +20,19 @@ class DeploymentEntity < Grape::Entity
   expose :created_at
   expose :tag
   expose :last?
-
   expose :user, using: UserEntity
-  expose :commit, using: CommitEntity
-  expose :deployable, using: JobEntity
-  expose :manual_actions, using: JobEntity, if: -> (*) { can_create_deployment? }
-  expose :scheduled_actions, using: JobEntity, if: -> (*) { can_create_deployment? }
+
+  expose :commit, using: CommitEntity, if: -> (*) { include_details? }
+  expose :deployable, using: JobEntity, if: -> (*) { include_details? }
+  expose :manual_actions, using: JobEntity, if: -> (*) { include_details? && can_create_deployment? }
+  expose :scheduled_actions, using: JobEntity, if: -> (*) { include_details? && can_create_deployment? }
   private
+  def include_details?
+    options.fetch(:deployment_details, true)
+  end
+
   def can_create_deployment?
     can?(request.current_user, :create_deployment, request.project)
   end

spec/controllers/projects/jobs_controller_spec.rb

@@ -253,14 +253,14 @@ describe Projects::JobsController, :clean_gitlab_redis_shared_state do
       end
       context 'with deployment' do
-        before do
-          create(:deployment, :success, environment: environment, project: project)
-        end
-
         let(:merge_request) { create(:merge_request, source_project: project) }
         let(:environment) { create(:environment, project: project, name: 'staging', state: :available) }
         let(:job) { create(:ci_build, :running, environment: environment.name, pipeline: pipeline) }
+        before do
+          create(:deployment, :success, environment: environment, project: project)
+        end
+
         it 'exposes the deployment information' do
           get_show_json

spec/serializers/build_details_entity_spec.rb

@@ -138,11 +138,11 @@ describe BuildDetailsEntity do
         allow(request).to receive(:project).and_return(project)
       end
-      it 'does not serialize latest deployment commit' do
+      it 'does not serialize latest deployment commit and associated builds' do
         response = subject.with_indifferent_access
         response.dig(:deployment_status, :environment, :last_deployment).tap do |deployment|
-          expect(deployment).not_to include(:commit)
+          expect(deployment).not_to include(:commit, :deployable, :manual_actions, :scheduled_actions)
         end
       end
     end

spec/serializers/deployment_entity_spec.rb

@@ -10,6 +10,7 @@ describe DeploymentEntity do
   let(:build) { create(:ci_build, :manual, pipeline: pipeline) }
   let(:pipeline) { create(:ci_pipeline, project: project, user: user) }
   let(:entity) { described_class.new(deployment, request: request) }
+
   subject { entity.as_json }
   before do
@@ -47,6 +48,16 @@ describe DeploymentEntity do
         expect(subject[:manual_actions]).not_to be_present
       end
     end
+
+    context 'when deployment details serialization was disabled' do
+      let(:entity) do
+        described_class.new(deployment, request: request, deployment_details: false)
+      end
+
+      it 'does not serialize manual actions details' do
+        expect(subject.with_indifferent_access).not_to include(:manual_actions)
+      end
+    end
   end
   describe 'scheduled_actions' do
@@ -69,5 +80,26 @@ describe DeploymentEntity do
         expect(subject[:scheduled_actions]).to be_empty
       end
     end
+
+    context 'when deployment details serialization was disabled' do
+      let(:entity) do
+        described_class.new(deployment, request: request, deployment_details: false)
+      end
+
+      it 'does not serialize scheduled actions details' do
+        expect(subject.with_indifferent_access).not_to include(:scheduled_actions)
+      end
+    end
+  end
+
+  context 'when deployment details serialization was disabled' do
+    let(:entity) do
+      described_class.new(deployment, request: request, deployment_details: false)
+    end
+
+    it 'does not serialize deployment details' do
+      expect(subject.with_indifferent_access)
+        .not_to include(:commit, :deployable, :manual_actions, :scheduled_actions)
+    end
   end
 end