Backport of 4084-epics-username-autocomplete

1 files changed, 41 insertions, 0 deletions

diff --git a/app/services/concerns/users/participable_service.rb b/app/services/concerns/users/participable_service.rb
new file mode 100644
index 00000000000..bf60b96938d
--- /dev/null
+++ b/app/services/concerns/users/participable_service.rb
@@ -0,0 +1,41 @@
+module Users
+  module ParticipableService
+    extend ActiveSupport::Concern
+
+    included do
+      attr_reader :noteable
+    end
+
+    def noteable_owner
+      return [] unless noteable && noteable.author.present?
+
+      [as_hash(noteable.author)]
+    end
+
+    def participants_in_noteable
+      return [] unless noteable
+
+      users = noteable.participants(current_user)
+      sorted(users)
+    end
+
+    def sorted(users)
+      users.uniq.to_a.compact.sort_by(&:username).map do |user|
+        as_hash(user)
+      end
+    end
+
+    def groups
+      current_user.authorized_groups.sort_by(&:path).map do |group|
+        count = group.users.count
+        { username: group.full_path, name: group.full_name, count: count, avatar_url: group.avatar_url }
+      end
+    end
+
+    private
+
+    def as_hash(user)
+      { username: user.username, name: user.name, avatar_url: user.avatar_url }
+    end
+  end
+end