Avoid namespacing routes inside engines

Since #11544, invoking the controller generator, any generated route is
namespaced according to the class_path method. Since a mountable plugin
is namespaced, creating a controller inside would generate a namespaced
route based on the engine's name.

The controller generator now relies on regular_class_path which does not
contain the class hierarchy but the given path.

Fixes #14079.

1 files changed, 12 insertions, 0 deletions

diff --git a/railties/test/generators/plugin_generator_test.rb b/railties/test/generators/plugin_generator_test.rb
index 932cd75bcb..b2fc3a2a4f 100644
--- a/railties/test/generators/plugin_generator_test.rb
+++ b/railties/test/generators/plugin_generator_test.rb
@@ -355,6 +355,18 @@ class PluginGeneratorTest < Rails::Generators::TestCase
     FileUtils.rm gemfile_path
   end
 
+  def test_generating_controller_inside_mountable_engine
+    run_generator [destination_root, "--mountable"]
+
+    capture(:stdout) do
+      `#{destination_root}/bin/rails g controller admin/dashboard foo`
+    end
+
+    assert_file "config/routes.rb" do |contents|
+      assert_match(/namespace :admin/, contents)
+      assert_no_match(/namespace :bukkit/, contents)
+    end
+  end
 
 protected
   def action(*args, &block)