Ruby-on-rails 如何从视图调用应用程序助手中的方法？
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How do I call a method in application helper from a view?
提问by Adam Lee
I defined a custom method in application_helper.rb file like the following:
我在 application_helper.rb 文件中定义了一个自定义方法，如下所示：
def rxtrnk(line)
rxTRNK = /\w{9,12}/m
trnks = Array.new
i = 0
while i <= line.size
if line[i].match(rxTRNK)
trnks[i] = line[i].scan(rxTRNK)
end
i += 1
end
return trnks
end
Then I tried to call it from a view like so:
然后我尝试从这样的视图中调用它：
<% @yo = rxtrnk(@rts)%>
But I get an error page like this:
但是我得到一个这样的错误页面：
NoMethodError in TrunksController#routesperswitch
undefined method `rxtrnk' for #<TrunksController:0x7f2dcf88>
I know this is a very newbie question, but I couldn't find solution from googling :( Thanks for your help
我知道这是一个非常新手的问题，但我无法通过谷歌搜索找到解决方案:(感谢您的帮助
edit/ here is the full application_helper.rb
编辑/这里是完整的 application_helper.rb
module ApplicationHelper
def rxtrnk(line)
rxTRNK = /\w{9,12}/m
trnks = Array.new
i = 0
while i <= line.size
if line[i].match(rxTRNK)
trnks[i] = line[i].scan(rxTRNK)
end
i += 1
end
return trnks
end
end
回答by ez.
not sure what is the issue, but you can solve this by include the application_helper in the controller
不确定是什么问题，但您可以通过在控制器中包含 application_helper 来解决此问题
class TrunksController
include ApplicationHelper
end
In the view call:
在视图调用中：
<%= @controller.rxtrnk %>
回答by Thomas Watson
You should make sure that the helper containing the method you want to call is included by the current controller (in your case you want to include the ApplicationHelper). This is controlled using the "helper" methodin top of controllers.
您应该确保包含您要调用的方法的助手包含在当前控制器中（在您的情况下，您希望包含 ApplicationHelper）。这是使用控制器顶部的“ helper”方法控制的。
Many Rails developers just include all helpers by default to avoid having to think about this. To do this add "helper :all" to the top of your ApplicationController:
许多 Rails 开发人员默认情况下只包含所有帮助程序，以避免考虑这一点。为此helper :all，在 ApplicationController 的顶部添加“ ”：
class ApplicationController < ActionController::Base
helper :all
endYou can also choose to only include the ApplicationHelper:
你也可以选择只包含 ApplicationHelper：
class ApplicationController < ActionController::Base
helper ApplicationHelper
end回答by Pete
your TrunksController might not be extending from the ApplicationController. The application Controller includes the Application helper so if you extend your controller form it, you should have access to those methods.
您的 TrunksController 可能不是从 ApplicationController 扩展的。应用程序控制器包括应用程序助手，因此如果您从它扩展控制器，您应该可以访问这些方法。
The start of your controller should be something like:
控制器的开头应该是这样的：
class TrunksController < ApplicationController
