Class: ActionView::Base

Inherits:
Object show all
Defined in:
lib/test/rails/render_tree.rb

Overview

test/rails/render_tree.rb adds debug rendering to ActionView::Base#render.

Debug rendering prints out a tree of calls to render allowing you to easily visualize where rendering occurs in unfamiliar code.

Constant Summary collapse

RENDERS =

List of render types for ActionView::Base#render

[:partial, :template, :file, :action, :text, :inline, :nothing,
:update]

Instance Method Summary collapse

Instance Method Details

#plain_render ⇒ Object

:nodoc:



9
 
# File 'lib/test/rails/render_tree.rb', line 9

alias plain_render render

#render(*args) ⇒ Object

Add debug output to rendering.

When you include lib/rails/render_tree a tree of renders will be displayed in the console. This is especially useful when writing tests.

This test:

require 'test/test_helper'
require 'test/rails/render_tree'

class ThingsViewTest < Test::Rails::ViewTestCase

  fixtures :goals

  def test_body
    assigns[:goal] = goals(:first)
    assigns[:related_goals_moved] = []
    assigns[:related_goals_instead] = []

    render :partial => 'things/body'

    assert_tag :tag => 'div', :attributes => { :id => 'entriesbucket' }
  end

end

Will give this output when run:

$ ruby test/views/things_view_test.rb -n test_body
Loaded suite test/views/things_view_test
Started
"things/_body"
  :partial => "widgets/goals_gallery_teaser"
    "widgets/_goals_gallery_teaser"
  :partial => "entries_bucket"
    "things/_entries_bucket"
  :partial => "things/ask_a_question"
    "things/_ask_a_question"
  "widgets/forms/related_goals"
.
Finished in 1.293523 seconds.

1 tests, 1 assertions, 0 failures, 0 errors



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# File 'lib/test/rails/render_tree.rb', line 62

def render(*args)
  @level ||= 0

  print '  ' * @level

  case args.first
  when String then
    p args.first
  when Hash then
    hash = args.first
    if hash.include? :collection and hash.include? :partial then
      puts "%p => %p" % [:collection, hash[:partial]]
    else
      found = hash.keys & RENDERS
      if found.length == 1 then
        puts "%p => %p" % [found.first, hash[found.first]]
      else
        raise "Dunno: %p" % [hash]
      end
    end
  else
    raise "Dunno: %p" % [args]
  end

  @level += 1
  result = plain_render(*args)
  @level -= 1
  result
end