instance method `debug`

Ruby on Rails 4.0.13

Since v2.2.3

Available in: v2.2.3 v2.3.18 v3.0.20 v3.1.12 v3.2.22.5 v4.0.13 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2

Compare with:

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:
&nbsp; updated_at:
&nbsp; username: testing

&nbsp; age: 42
&nbsp; password: xyz
&nbsp; created_at:
attributes_cache: {}

new_record: true
</pre>

Parameters

object req

Source

# File actionpack/lib/action_view/helpers/debug_helper.rb, line 29
      def debug(object)
        Marshal::dump(object)
        object = ERB::Util.html_escape(object.to_yaml).gsub("  ", "&nbsp; ").html_safe
        content_tag(:pre, object, :class => "debug_dump")
      rescue Exception  # 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

Defined in actionpack/lib/action_view/helpers/debug_helper.rb line 29 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActionView::Helpers::DebugHelper

Signature

Parameters