Fix related environments on pipeline

This commit fixes the database query to fetch
related environments of a pipeline.

The feature is still behind a feature flag.

app/models/ci/pipeline.rb

@@ -957,7 +957,7 @@ module Ci
                                         .limit(100)
                                         .pluck(:expanded_environment_name)
 
-        Environment.where(project: project, name: expanded_environment_names)
+        Environment.where(project: project, name: expanded_environment_names).with_deployments
       else
         environment_ids = self_and_descendants.joins(:deployments).select(:'deployments.environment_id')
 

app/models/environment.rb

@@ -89,6 +89,7 @@ class Environment < ApplicationRecord
 
   scope :for_project, -> (project) { where(project_id: project) }
   scope :for_tier, -> (tier) { where(tier: tier).where.not(tier: nil) }
+  scope :with_deployments, -> { where('EXISTS (?)', Deployment.select(1).where('deployments.environment_id = environments.id')) }
   scope :with_deployment, -> (sha) { where('EXISTS (?)', Deployment.select(1).where('deployments.environment_id = environments.id').where(sha: sha)) }
   scope :unfoldered, -> { where(environment_type: nil) }
   scope :with_rank, -> do

spec/models/ci/pipeline_spec.rb

@@ -3180,6 +3180,20 @@ RSpec.describe Ci::Pipeline, :mailer, factory_default: :keep do
       end
     end
 
+    context 'when an associated environment does not have deployments' do
+      let_it_be(:pipeline) { create(:ci_pipeline, :created) }
+      let_it_be(:build) { create(:ci_build, :stop_review_app, pipeline: pipeline) }
+      let_it_be(:environment) { create(:environment, project: pipeline.project) }
+
+      before_all do
+        build.metadata.update!(expanded_environment_name: environment.name)
+      end
+
+      it 'does not return environments' do
+        expect(subject).to be_empty
+      end
+    end
+
     context 'when pipeline is in extended family' do
       let_it_be(:parent) { create(:ci_pipeline) }
       let_it_be(:parent_build) { create(:ci_build, :with_deployment, environment: 'staging', pipeline: parent) }