Improved how AppGenerator generates the application name. It now detects the current app name whenever possible. This means that renaming the residing directory will not effect the app name generated by AppGenerator.

[#5225 state:resolved]

Signed-off-by: José Valim <jose.valim@gmail.com>

railties/lib/rails/generators/rails/app/app_generator.rb

@@ -356,8 +356,12 @@ module Rails
         @app_name ||= File.basename(destination_root)
       end
 
+      def defined_app_const_base
+        Rails.application.class.name.sub(/::Application$/, "") if Rails.application.instance_of?(Rails::Application)
+      end
+
       def app_const_base
-        @app_const_base ||= app_name.gsub(/\W/, '_').squeeze('_').camelize
+        @app_const_base ||= defined_app_const_base || app_name.gsub(/\W/, '_').squeeze('_').camelize
       end
 
       def app_const

railties/test/generators/app_generator_test.rb

@@ -106,6 +106,30 @@ class AppGeneratorTest < Rails::Generators::TestCase
     assert_file "things-43/config/application.rb", /^module Things43$/
   end
 
+  def test_application_name_is_detected_if_it_exists_and_app_folder_renamed
+    app_root       = File.join(destination_root, "myapp")
+    app_moved_root = File.join(destination_root, "myapp_moved")
+
+    run_generator [app_root]
+
+    Rails.application.config.root = app_moved_root
+    Rails.application.class.stubs(:name).returns("Myapp")
+    Rails.application.stubs(:instance_of?).returns(Rails::Application)
+
+    FileUtils.mv(app_root, app_moved_root)
+
+    # forces the shell to automatically overwrite all files
+    Thor::Base.shell.send(:attr_accessor, :always_force)
+    shell = Thor::Base.shell.new
+    shell.send(:always_force=, true)
+
+    generator = Rails::Generators::AppGenerator.new ["rails"], { :with_dispatchers => true },
+                                                               :destination_root => app_moved_root, :shell => shell
+    generator.send(:app_const)
+    silence(:stdout){ generator.send(:create_config_files) }
+    assert_file "myapp_moved/config/environment.rb", /Myapp::Application\.initialize!/
+  end
+
   def test_application_names_are_not_singularized
     run_generator [File.join(destination_root, "hats")]
     assert_file "hats/config/environment.rb", /Hats::Application\.initialize!/