Uninitialized constant ActionView::Helpers::InstanceTag in Rails 4

问题

I have the following code, which I use to customize form_for. I need to inherit ActionView::Helpers::InstanceTag

class InstanceTag < ActionView::Helpers::InstanceTag

I get exception after the upgrade to Rails 4 and I saw that in the docs there is no such class. What is the best class to use instead of it?

回答1:

After some research. I found that

ActionView::Helpers::InstanceTag 

is transformed into module called ActiveModelInstanceTag

ActionView::Helpers::ActiveModelInstanceTag

来源：https://stackoverflow.com/questions/18409891/uninitialized-constant-actionviewhelpersinstancetag-in-rails-4