Move code for playing an action to separate service

app/models/ci/build.rb

@@ -122,18 +122,9 @@ module Ci
     end
 
     def play(current_user)
-      unless can_play?(current_user)
-        raise Gitlab::Access::AccessDeniedError
-      end
-
-      # Try to queue a current build
-      if self.enqueue
-        self.update(user: current_user)
-        self
-      else
-        # Otherwise we need to create a duplicate
-        Ci::Build.retry(self, current_user)
-      end
+      Ci::PlayBuildService
+        .new(project, current_user)
+        .execute(self)
     end
 
     def cancelable?

app/policies/ci/build_policy.rb

@@ -17,7 +17,7 @@ module Ci
     alias_method :build, :subject
 
     def can_play_action?
-      return false unless build.playable?
+      return false unless build.action?
 
       ::Gitlab::UserAccess
         .new(user, project: build.project)

app/services/ci/play_build_service.rb

+module Ci
+  class PlayBuildService < ::BaseService
+    def execute(build)
+      unless can?(current_user, :play_build, build)
+        raise Gitlab::Access::AccessDeniedError
+      end
+
+      # Try to enqueue thebuild, otherwise create a duplicate.
+      #
+      if build.enqueue
+        build.tap { |action| action.update(user: current_user) }
+      else
+        Ci::Build.retry(build, current_user)
+      end
+    end
+  end
+end