CODEWITHSUNDEEP
ruby-on-railsruby
Mariy
Mariy

Reputation: 5924

Why there is no double-render when using before_action?

I am wondering why there is no double-render when there is a redirect_to or render in before_action. Consider this example:

class SomeController < ApplicationController
 before_action :callback

 def new
  callback2
  render 'new'
 end

 def callback
  render 'new'
 end

 def callback2
  render 'new'
 end

end

I see that before_action will be useless if it can't redirect but how it is made? If I comment the before_action it will throw exception. How is before_action implemented to not cause double-render?

Upvotes: 32

Views: 9653

Answers (1)

Baldrick
Baldrick

Reputation: 24340

See the Rails Guide on controllers :

If a "before" filter renders or redirects, the action will not run. If there are additional filters scheduled to run after that filter, they are also cancelled.

Upvotes: 62

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