In rails >4.0.0 generators creates CRUD operations with before_action not before_filter. It seems to do the same thing. So what's the difference between these two?
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问题:
回答1:
As we can see in ActionController::Base, before_action is just a new syntax for before_filter.
However all before_filters syntax are deprecated in Rails 5.0 and will be removed in Rails 5.1
回答2:
It is just syntax difference, in rails app there is CRUD, and seven actions basically by name index, new, create, show, update, edit, destroy.
Rails 4 make it developer friendly to change syntax before filter to before action.
before_action call method before the actions which we declare, like
before_action :set_event, only: [:show, :update, :destroy, :edit] set_event is a method which will call always before show, update, edit and destroy.
回答3:
It is just a name change. before_action is more specific, because it gets executed before an action.
回答4:
To figure out what is the difference between before_action and before_filter, we should understand the difference between action and filter.
An action is a method of a controller to which you can route to. For example, your user creation page might be routed to UsersController#new - new is the action in this route.
Filters run in respect to controller actions - before, after or around them. These methods can halt the action processing by redirecting or set up common data to every action in the controller.