Share project object in EnvironmentStatus

Otherwise, each EnvironmentStatus object instantiates its own project
when really they are the same. Improves query count performance

app/models/environment_status.rb

@@ -3,11 +3,10 @@
 class EnvironmentStatus
   include Gitlab::Utils::StrongMemoize
-  attr_reader :environment, :merge_request, :sha
+  attr_reader :project, :environment, :merge_request, :sha
   delegate :id, to: :environment
   delegate :name, to: :environment
-  delegate :project, to: :environment
   delegate :status, to: :deployment, allow_nil: true
   delegate :deployed_at, to: :deployment, allow_nil: true
@@ -21,7 +20,8 @@ class EnvironmentStatus
     build_environments_status(mr, user, mr.merge_pipeline)
   end
-  def initialize(environment, merge_request, sha)
+  def initialize(project, environment, merge_request, sha)
+    @project = project
     @environment = environment
     @merge_request = merge_request
     @sha = sha
@@ -67,7 +67,7 @@ class EnvironmentStatus
     pipeline.environments.available.map do |environment|
       next unless Ability.allowed?(user, :read_environment, environment)
-      EnvironmentStatus.new(environment, mr, pipeline.sha)
+      EnvironmentStatus.new(pipeline.project, environment, mr, pipeline.sha)
     end.compact
   end
   private_class_method :build_environments_status

spec/models/environment_status_spec.rb

@@ -11,11 +11,10 @@ describe EnvironmentStatus do
   let(:merge_request) { create(:merge_request, :deployed_review_app, deployment: deployment) }
   let(:sha)           { deployment.sha }
-  subject(:environment_status) { described_class.new(environment, merge_request, sha) }
+  subject(:environment_status) { described_class.new(project, environment, merge_request, sha) }
   it { is_expected.to delegate_method(:id).to(:environment) }
   it { is_expected.to delegate_method(:name).to(:environment) }
-  it { is_expected.to delegate_method(:project).to(:environment) }
   it { is_expected.to delegate_method(:deployed_at).to(:deployment) }
   it { is_expected.to delegate_method(:status).to(:deployment) }

spec/serializers/environment_status_entity_spec.rb

@@ -9,7 +9,7 @@ describe EnvironmentStatusEntity do
   let(:project)       { deployment.project }
   let(:merge_request) { create(:merge_request, :deployed_review_app, deployment: deployment) }
-  let(:environment_status) { EnvironmentStatus.new(environment, merge_request, merge_request.diff_head_sha) }
+  let(:environment_status) { EnvironmentStatus.new(project, environment, merge_request, merge_request.diff_head_sha) }
   let(:entity)             { described_class.new(environment_status, request: request) }
   subject { entity.as_json }
@@ -55,8 +55,14 @@ describe EnvironmentStatusEntity do
     before do
       project.add_maintainer(user)
       allow(deployment).to receive(:prometheus_adapter).and_return(prometheus_adapter)
-      allow(prometheus_adapter).to receive(:query).with(:deployment, deployment).and_return(simple_metrics)
       allow(entity).to receive(:deployment).and_return(deployment)
+
+      expect_next_instance_of(DeploymentMetrics) do |deployment_metrics|
+        allow(deployment_metrics).to receive(:prometheus_adapter).and_return(prometheus_adapter)
+
+        allow(prometheus_adapter).to receive(:query)
+          .with(:deployment, deployment).and_return(simple_metrics)
+      end
     end
     context 'when deployment succeeded' do