Revert "Merge pull request rails#27550 from mtsmfm/fix-generator-command-for-nested-rails-engine"

This reverts commit 1e969bf, reversing
changes made to a5041f2.

Reason: It breaks the public API

Author: rafaelfranca

actionmailer/lib/rails/generators/mailer/mailer_generator.rb

@@ -26,7 +26,7 @@ def file_name # :doc:
 
         def application_mailer_file_name
           @_application_mailer_file_name ||= if mountable_engine?
-            File.join("app/mailers", namespaced_path, "application_mailer.rb")
+            "app/mailers/#{namespaced_path}/application_mailer.rb"
           else
             "app/mailers/application_mailer.rb"
           end

activejob/lib/rails/generators/job/job_generator.rb

@@ -28,7 +28,7 @@ def create_job_file
       private
         def application_job_file_name
           @application_job_file_name ||= if mountable_engine?
-            File.join("app/jobs", namespaced_path, "application_job.rb")
+            "app/jobs/#{namespaced_path}/application_job.rb"
           else
             "app/jobs/application_job.rb"
           end

activerecord/lib/rails/generators/active_record/model/model_generator.rb

@@ -59,7 +59,7 @@ def application_record_exist?
 
         def application_record_file_name
           @application_record_file_name ||= if mountable_engine?
-            File.join("app/models", namespaced_path, "application_record.rb")
+            "app/models/#{namespaced_path}/application_record.rb"
           else
             "app/models/application_record.rb"
           end

railties/lib/rails/generators/named_base.rb

@@ -95,11 +95,11 @@ def regular_class_path # :doc:
         end
 
         def namespaced_class_path # :doc:
-          @namespaced_class_path ||= namespaced_path + @class_path
+          @namespaced_class_path ||= [namespaced_path] + @class_path
         end
 
         def namespaced_path # :doc:
-          @namespaced_path ||= namespace.name.split("::").map(&:underscore)
+          @namespaced_path ||= namespace.name.split("::").first.underscore
         end
 
         def class_name # :doc:

railties/lib/rails/generators/rails/controller/templates/controller.rb

@@ -1,5 +1,5 @@
 <% if namespaced? -%>
-require_dependency "<%= File.join(namespaced_path) %>/application_controller"
+require_dependency "<%= namespaced_path %>/application_controller"
 
 <% end -%>
 <% module_namespacing do -%>

railties/lib/rails/generators/rails/scaffold_controller/templates/api_controller.rb

@@ -1,5 +1,5 @@
 <% if namespaced? -%>
-require_dependency "<%= File.join(namespaced_path) %>/application_controller"
+require_dependency "<%= namespaced_path %>/application_controller"
 
 <% end -%>
 <% module_namespacing do -%>

railties/lib/rails/generators/rails/scaffold_controller/templates/controller.rb

@@ -1,5 +1,5 @@
 <% if namespaced? -%>
-require_dependency "<%= File.join(namespaced_path) %>/application_controller"
+require_dependency "<%= namespaced_path %>/application_controller"
 
 <% end -%>
 <% module_namespacing do -%>

railties/lib/rails/generators/test_unit/scaffold/scaffold_generator.rb

@@ -22,7 +22,7 @@ def create_test_files
       def fixture_name
         @fixture_name ||=
           if mountable_engine?
-            "%s_%s" % [namespaced_path.join("_"), table_name]
+            "%s_%s" % [namespaced_path, table_name]
           else
             table_name
           end

railties/test/generators/scaffold_generator_test.rb

@@ -492,26 +492,6 @@ def test_scaffold_tests_pass_by_default_inside_mountable_engine
     end
   end
 
-  def test_scaffold_tests_pass_by_default_inside_namespaced_mountable_engine
-    Dir.chdir(destination_root) { `bundle exec rails plugin new bukkits-admin --mountable` }
-
-    engine_path = File.join(destination_root, "bukkits-admin")
-
-    Dir.chdir(engine_path) do
-      quietly do
-        `bin/rails g scaffold User name:string age:integer;
-        bin/rails db:migrate`
-      end
-
-      assert_file "bukkits-admin/app/controllers/bukkits/admin/users_controller.rb" do |content|
-        assert_match(/module Bukkits::Admin/, content)
-        assert_match(/class UsersController < ApplicationController/, content)
-      end
-
-      assert_match(/8 runs, 10 assertions, 0 failures, 0 errors/, `bin/rails test 2>&1`)
-    end
-  end
-
   def test_scaffold_tests_pass_by_default_inside_full_engine
     Dir.chdir(destination_root) { `bundle exec rails plugin new bukkits --full` }