Don't load app environment when editing credentials

This avoids missing key exceptions caused by code that tries to read the credentials before they have been added to the encrypted file, for example when editing the credentials for a new environment.

railties/lib/rails/command/actions.rb

@@ -11,10 +11,20 @@ def set_application_directory!
       end
 
       def require_application_and_environment!
+        require_application!
+        require_environment!
+      end
+
+      def require_application!
         require ENGINE_PATH if defined?(ENGINE_PATH)
 
         if defined?(APP_PATH)
           require APP_PATH
+        end
+      end
+
+      def require_environment!
+        if defined?(APP_PATH)
           Rails.application.require_environment!
         end
       end

railties/lib/rails/commands/credentials/credentials_command.rb

@@ -20,7 +20,7 @@ def help
       end
 
       def edit
-        require_application_and_environment!
+        require_application!
 
         ensure_editor_available(command: "bin/rails credentials:edit") || (return)
 
@@ -39,7 +39,7 @@ def edit
       end
 
       def show
-        require_application_and_environment!
+        require_application!
 
         encrypted = Rails.application.encrypted(content_path, key_path: key_path)
 

railties/test/commands/credentials_test.rb

@@ -63,6 +63,14 @@ class Rails::Command::CredentialsCommandTest < ActiveSupport::TestCase
     end
   end
 
+  test "edit command does not raise when an initializer tries to acces non-existent credentials" do
+    app_file "config/initializers/raise_when_loaded.rb", <<-RUBY
+      Rails.application.credentials.missing_key!
+    RUBY
+
+    assert_match(/access_key_id: 123/, run_edit_command(environment: "qa"))
+  end
+
   test "show credentials" do
     assert_match(/access_key_id: 123/, run_show_command)
   end