Action View Debug Helpers

Provides a set of methods for making it easier to debug Rails objects.

Methods

Included Modules

Instance Public methods

debug(object)

Returns a YAML representation of object wrapped with <pre> and </pre>. If the object cannot be converted to YAML using to_yaml, inspect will be called instead. Useful for inspecting an object at the time of rendering.

@user = User.new({ username: 'testing', password: 'xyz', age: 42})
debug(@user)
# =>
<pre class='debug_dump'>--- !ruby/object:User
attributes:
  updated_at:
  username: testing
  age: 42
  password: xyz
  created_at:
</pre>
📝 Source code 
# File actionview/lib/action_view/helpers/debug_helper.rb, line 28
      def debug(object)
        Marshal.dump(object)
        object = ERB::Util.html_escape(object.to_yaml)
        content_tag(:pre, object, class: "debug_dump")
      rescue # errors from Marshal or YAML
        # Object couldn't be dumped, perhaps because of singleton methods -- this is the fallback
        content_tag(:code, object.inspect, class: "debug_dump")
      end
🔎 See on GitHub