Rails generate scaffold不再生成.jbuilder文件，自定义模板后如何恢复？

Hey there! Let's troubleshoot why your scaffold generator stopped creating .jbuilder files, especially since you've got custom model and view templates in place. Here are the key areas to check and adjust:

1. Inspect Your Custom Templates in lib/templates #

Since you mentioned having custom templates, this is the first place to look:

• Navigate to lib/templates/erb/scaffold (or the corresponding directory for your template engine) and check files like scaffold_controller.rb.tt. The default Rails scaffold controller template includes logic to generate .jbuilder files for JSON responses—if you modified this file, make sure you didn't remove the respond_to block that handles format.json (which triggers jbuilder template creation).
• Verify that you haven't deleted or altered the jbuilder-specific template files under lib/templates/jbuilder/scaffold (like index.json.jbuilder.tt or show.json.jbuilder.tt). If these custom templates were removed, Rails won't generate the .jbuilder files.

2. Check Global Generator Config in config/application.rb #

Open your config/application.rb file and look for a generator configuration block. If you see a line like this, it's disabling jbuilder generation:

config.generators do |g|
  g.jbuilder false # This turns off .jbuilder file creation
end

To fix this, either change false to true or remove the g.jbuilder line entirely to restore the default behavior.

3. Confirm the Jbuilder Gem Is Installed #

Double-check your Gemfile to ensure gem 'jbuilder' is present. If it's missing, add it and run bundle install to reinstall the gem. Even if you used it before, it might have been accidentally removed during a gem update or dependency change.

4. Test with Default Templates (If Custom Templates Are Suspect) #

If you're still stuck, temporarily rename your lib/templates/scaffold directory (e.g., to scaffold_backup) and run the scaffold generator again. If .jbuilder files now generate, the issue is in your custom templates. You can then compare the default Rails templates with your custom ones to spot what was changed or missing.

内容的提问来源于stack exchange，提问作者Peter Van de Put