如何从String查找和使用辅助方法

Question

I would like to know how to find and use a helper method, when I have the name of the helper in a string format.

I am writing an engine, and in the initializer file, users can specify the current_user_helper as such:

MyEngine.current_user_helper = "current_user"

I would like to do something with this in the controller. For instance, the code below tries to create a Post for the logged in user.

MyEngine.current_user_helper.posts.new(post_params)

Yet, this code does not work because MyEngine.current_user_helper is a string. Apparently, Rails will throw an error when I try:

MyEngine.current_user_helper = current_user

without the quotation marks.

Any suggestions?

Answer 1

You can use send to call a method from a string or symbol. send is available on all descendants of Object.

send(MyEngine.current_user_helper).posts.new