Ruby On Rails Interview Questions and Answers
Ques. What is Filter and when is it called in Ruby on Rails?Ans.
Filters are methods that are called either before/after a controller action is called.
Say a user requests a controller action such as userdashboard/index
In such a case a filter can be setup so that the UserDashboard/index page is only accessible to loggedin users by adding the following lines towards the beginning of the page:
class UserDashboardController < ApplicationController
In the code above the condition “confirm_logged_in” is checked before all actions, except login, logout & attempt_login.
After filters (after_filter) are not used too much but they have the effect of executing some code after a particular action has completed.
Think of them like triggers that get executed automatically — just like a database trigger.
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