Ruby%20On%20Rails%20Interview%20Questions%20and%20Answers
Question: What is Filter and when is it called in Ruby on Rails?Answer: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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