Refactor Gitlab::Identifier

This refactors Gitlab::Identifier so it uses fewer queries and is
actually tested. Queries are reduced by caching the output as well as
using 1 query (instead of 2) to find a user using an SSH key.

1 files changed, 5 insertions, 0 deletions

diff --git a/app/models/user.rb b/app/models/user.rb
index 7f5a8562907..508efd85050 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -279,6 +279,11 @@ class User < ActiveRecord::Base
       find_by('users.username = ? OR users.id = ?', name_or_id.to_s, name_or_id.to_i)
     end
 
+    # Returns a user for the given SSH key.
+    def find_by_ssh_key_id(key_id)
+      find_by(id: Key.unscoped.select(:user_id).where(id: key_id))
+    end
+
     def build_user(attrs = {})
       User.new(attrs)
     end