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|
== Create a `squawk_info_for` view helper ==
Creating a view helper is a 3-step process:
* Add an appropriately named file to the 'lib' directory.
* Require the file and hooks in 'init.rb'.
* Write the tests.
First, create the test to define the functionality you want:
[source, ruby]
---------------------------------------------------------------
# File: vendor/plugins/yaffle/test/view_helpers_test.rb
require File.dirname(__FILE__) + '/test_helper.rb'
include YaffleViewHelper
class ViewHelpersTest < Test::Unit::TestCase
def test_squawk_info_for_should_return_the_text_and_date
time = Time.now
hickwall = Hickwall.new
hickwall.last_squawk = "Hello World"
hickwall.last_squawked_at = time
assert_equal "Hello World, #{time.to_s}", squawk_info_for(hickwall)
end
end
---------------------------------------------------------------
Then add the following statements to init.rb:
[source, ruby]
---------------------------------------------------------------
# File: vendor/plugins/yaffle/init.rb
require "view_helpers"
ActionView::Base.send :include, YaffleViewHelper
---------------------------------------------------------------
Then add the view helpers file and
[source, ruby]
---------------------------------------------------------------
# File: vendor/plugins/yaffle/lib/view_helpers.rb
module YaffleViewHelper
def squawk_info_for(yaffle)
returning "" do |result|
result << yaffle.read_attribute(yaffle.class.yaffle_text_field)
result << ", "
result << yaffle.read_attribute(yaffle.class.yaffle_date_field).to_s
end
end
end
---------------------------------------------------------------
You can also test this in script/console by using the `helper` method:
---------------------------------------------------------------
$ ./script/console
>> helper.squawk_info_for(@some_yaffle_instance)
---------------------------------------------------------------
|
