Rails 3 and Controller Instance Variables Inside a Helper
I just encounter a problem similar to http://www.ruby-forum.com/topic/216433
I need to access controller instance variable from helper.
Here is t开发者_如何转开发he code I have done, and it's not work.
Controller:
class ApplicationController < ActionController::Base
helper_method :set_background_type #for action only background setting
#for controller-wise background setting
def set_background_type(string)
@background_type = string
end
end
Helper:
module ApplicationHelper
def background_type
@background_type || 'default'
end
end
Layout:
<body class="<%= background_type %>">
After some searching. I got one solution from
http://api.rubyonrails.org/classes/ActionController/Helpers/ClassMethods.html
and the Controller becomes:
class ApplicationController < ActionController::Base
helper_method :set_background_type #for action only background setting
helper_attr :background_type
attr_accessor :background_type
#for controller-wise background setting
def set_background_type(string)
@background_type = string
end
def background_type
@background_type || 'default'
end
end
and remove the method from ApplicationHelper. It's work for this scenario, but I'm still curious,
is there a way to access controller instance variable for method in ApplicationHelper?
If you're using erb templates, which I'm guessing you are, then you need to use erb syntax to call the helper method. Have you tried:
<body class="<%= background_type %>">
?
加载中,请稍侯......
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