module ActionView::Helpers::DebugHelper - actionpack-3.2.22 Documentation

# module ActionView::Helpers::DebugHelper

### Public Instance Methods

debug(object) click to toggle source

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.

#### Example¶ ↑

    @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>

    # File lib/action_view/helpers/debug_helper.rb, line 29
    def debug(object)
      begin
        Marshal::dump(object)
        "<pre class='debug_dump'>#{h(object.to_yaml).gsub("  ", "&nbsp; ")}</pre>".html_safe
      rescue Exception  # errors from Marshal or YAML
        # Object couldn't be dumped, perhaps because of singleton methods -- this is the fallback
        "<code class='debug_dump'>#{h(object.inspect)}</code>".html_safe
      end
    end