Add minor improvements to container registry code

app/controllers/projects/registry/tags_controller.rb

@@ -15,15 +15,13 @@ module Projects
 
       private
 
-      def repository
+      def image
         @image ||= project.container_repositories
           .find(params[:repository_id])
       end
 
       def tag
-        return render_404 unless params[:id].present?
-
-        @tag ||= repository.tag(params[:id])
+        @tag ||= image.tag(params[:id])
       end
     end
   end

lib/container_registry/path.rb

 module ContainerRegistry
   ##
-  # Class reponsible for extracting project and repository name from
+  # Class responsible for extracting project and repository name from
   # image repository path provided by a containers registry API response.
   #
   # Example:
@@ -12,6 +12,8 @@ module ContainerRegistry
   class Path
     InvalidRegistryPathError = Class.new(StandardError)
 
+    LEVELS_SUPPORTED = 3
+
     def initialize(path)
       @path = path
     end
@@ -50,7 +52,9 @@ module ContainerRegistry
     end
 
     def repository_project
-      @project ||= Project.where_full_path_in(nodes.first(3)).first
+      @project ||= Project
+        .where_full_path_in(nodes.first(LEVELS_SUPPORTED))
+        .first
     end
 
     def repository_name