Fixing the issue of visiting a project fork url giving 500 error when not...

Fixing the issue of visiting a project fork url giving 500 error when not signed in instead of being redirected to the sign in page. The main reason is ApplicationController skips authentication if the project exists. To fix the issue, forced the authentication in ForksController when current_user is nil.

app/controllers/projects/forks_controller.rb

@@ -29,8 +29,12 @@ class Projects::ForksController < Projects::ApplicationController
   end
   def new
-    @namespaces = current_user.manageable_namespaces
-    @namespaces.delete(@project.namespace)
+    if current_user.nil?
+      authenticate_user!
+    else
+      @namespaces = current_user.manageable_namespaces
+      @namespaces.delete(@project.namespace)
+    end
   end
   def create

changelogs/unreleased/fix-singin-redirect-for-fork-new.yml

+---
+title: Fixing the issue of the project fork url giving 500 when not signed instead
+  of being redirected to sign in page
+merge_request: 
+author: Cagdas Gerede