Resolve a Cognitive Complexity of 12

app/services/releases/create_service.rb

@@ -8,9 +8,20 @@ module Releases
       return error('Access Denied', 403) unless allowed?
       return error('Release already exists', 409) if release
 
-      new_tag = nil
+      tag = ensure_tag
 
-      unless tag_exist?
+      return tag unless tag.is_a?(Gitlab::Git::Tag)
+
+      create_release(tag)
+    end
+
+    private
+
+    def ensure_tag
+      existing_tag || create_tag
+    end
+
+    def create_tag
       return error('Ref is not specified', 422) unless ref
 
       result = Tags::CreateService
@@ -19,14 +30,9 @@ module Releases
 
       return result unless result[:status] == :success
 
-        new_tag = result[:tag]
-      end
-
-      create_release(existing_tag || new_tag)
+      result[:tag]
     end
 
-    private
-
     def allowed?
       Ability.allowed?(current_user, :create_release, project)
     end