Move dynamic omniauth declarations to initializer

app/controllers/omniauth_callbacks_controller.rb

@@ -32,10 +32,6 @@ class OmniauthCallbacksController < Devise::OmniauthCallbacksController
     end
   end
 
-  Gitlab.config.ldap.servers.each do |server|
-    alias_method server.provider_name, :ldap
-  end
-
   def omniauth_error
     @provider = params[:provider]
     @error = params[:error]

config/initializers/7_omniauth.rb

@@ -2,3 +2,8 @@ module OmniAuth::Strategies
   server = Gitlab.config.ldap.servers.first
   const_set(server.provider_class, Class.new(LDAP))
 end
+
+OmniauthCallbacksController.class_eval do
+  server = Gitlab.config.ldap.servers.first
+  alias_method server.provider_name, :ldap
+end
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