Create a todo on failing MR build

When a build fails for a commit, create a todo for the author of the
merge request that commit is the HEAD of. If the commit isn't the HEAD
commit of any MR, don't do anything. If there already is a todo for that
user and MR, don't do anything.

Current limitations:
- This isn't configurable by project.
- The author of a merge request might not be the person who pushed the
  breaking commit.

1 files changed, 6 insertions, 2 deletions

diff --git a/app/helpers/todos_helper.rb b/app/helpers/todos_helper.rb
index 2f066682180..81b9b5d7052 100644
--- a/app/helpers/todos_helper.rb
+++ b/app/helpers/todos_helper.rb
@@ -11,6 +11,7 @@ module TodosHelper
     case todo.action
     when Todo::ASSIGNED then 'assigned you'
     when Todo::MENTIONED then 'mentioned you on'
+    when Todo::BUILD_FAILED then 'The build failed for your'
     end
   end
 
@@ -28,8 +29,11 @@ module TodosHelper
       namespace_project_commit_path(todo.project.namespace.becomes(Namespace), todo.project,
                                     todo.target, anchor: anchor)
     else
-      polymorphic_path([todo.project.namespace.becomes(Namespace),
-                        todo.project, todo.target], anchor: anchor)
+      path = [todo.project.namespace.becomes(Namespace), todo.project, todo.target]
+
+      path.unshift(:builds) if todo.build_failed?
+
+      polymorphic_path(path, anchor: anchor)
     end
   end