Expose `last_deployment` on `Ci::Builds` [ci skip]

app/helpers/environment_helper.rb

+module EnvironmentHelper
+  def environment_for_build(project, build)
+    return unless build.environment
+
+    environment_name = ExpandVariables.expand(build.environment, build.variables)
+    project.environments.find_by(name: environment_name)
+  end
+
+  def environment_link_for_build(project, build)
+    environment = environment_for_build(project, build)
+    return unless environment
+
+    link_to environment.name, namespace_project_environment_path(project.namespace, project, environment)
+  end
+
+  def deployment_link(project, deployment)
+    return unless deployment
+
+    link_to "##{deployment.id}", [deployment.project.namespace.becomes(Namespace), deployment.project, deployment.deployable]
+  end
+end

app/models/ci/build.rb

@@ -7,6 +7,8 @@ module Ci
     belongs_to :trigger_request
     belongs_to :erased_by, class_name: 'User'
 
+    has_many :deployments, as: :deployable
+
     serialize :options
     serialize :yaml_variables
 
@@ -125,10 +127,12 @@ module Ci
       !self.pipeline.statuses.latest.include?(self)
     end
 
-    def last_deployment
-      return @last_deployment if defined?(@last_deployment)
+    def deployable?
+      self.environment.present?
+    end
 
-      @last_deployment = Deployment.where(deployable: self).order(id: :desc).last
+    def last_deployment
+      deployments.order(id: :desc).last
     end
 
     def depends_on_builds

app/views/projects/builds/show.html.haml

@@ -26,28 +26,30 @@
             = link_to namespace_project_runners_path(@build.project.namespace, @build.project) do
               Runners page
 
-    - if @build.deploy
+    - if @build.deployable?
       .prepend-top-default
         .environment-information
           = ci_icon_for_status(@build.status)
 
-          - if @build.last_deployment
+          - last_deployment = @build.last_deployment
+          - if @build.complete?
+            - if @build.success?
+              - if last_deployment.try(:last?)
                 This build is the most recent deployment to
-            = link_to @build.environment, namespace_project_environment_path(@project.namespace, @project, @build.environment)
+                = environment_link_for_build(@build.project, @build)
+              - else
+                This build is an out-of-date deployment to
+                = environment_link_for_build(@build.project, @build)
+                View the most recent deployment
+                = deployment_link(@project, last_deployment)
             - else
-            - case @build.status
-            - when 'failed', 'canceled'
               The deployment of this build to
-              = link_to @build.environment, namespace_project_environment_path(@project.namespace, @project, @build.environment)
+              = environment_link_for_build(@build.project, @build)
               did not complete
-            - when 'pending', 'running'
+          - else
             This build is creating a deployment to
-              = link_to @build.environment, namespace_project_environment_path(@project.namespace, @project, @build.environment)
+            = environment_link_for_build(@build.project, @build)
             and will overwrite the latest deployment
-            - when 'success'
-              This build is an out-of-date deployment to
-              = link_to @build.environment, namespace_project_environment_path(@project.namespace, @project, @build.environment)
-              View the most recent deployment #24869
 
     .prepend-top-default
       - if @build.erased?

app/workers/build_success_worker.rb

@@ -4,15 +4,13 @@ class BuildSuccessWorker
 
   def perform(build_id)
     Ci::Build.find_by(id: build_id).try do |build|
-      create_deployment(build)
+      create_deployment(build) if build.deployable?
     end
   end
 
   private
 
   def create_deployment(build)
-    return if build.environment.blank?
-
     service = CreateDeploymentService.new(
       build.project, build.user,
       environment: build.environment,