'custom instance variable name in cancan's load_and_authorize_resource?

users_controller.rb 

class UsersController < ApplicationController  
  def index
    @objects = User.filter(params: params)
  end
end

Q.1 > If 'load_and_authorize_resource' is called then what instance variable it will load ?
Q.2 > If it loads @user or @users then how to make it load on @object ?

I think I'm lacking sufficient knowledge understanding cancan (i'm a rails newbie) and using it since last 4 days, hoping this question makes sense.

ruby-on-rails-4ruby-2.1


Solution 1:[1]

A resource is not loaded if the instance variable is already set. This makes it easy to override the behavior through a before_filter on certain actions - from cancan https://github.com/ryanb/cancan/blob/master/lib/cancan/controller_additions.rb line 34 and 35, so you can do like this in your controller -- 

before_filter :set_instance_variable  
load_and_authorize_resource  
private  
  def set_instance_variable
    @object = "blah blah blah"  
  end

load_and_authorize_resource should be called after setting instance variable i.e. after 'before_filter :set_instance_variable'

Solution 2:[2]

Q1. For UsersController it will be @user

Q2. If you have a right routes you can use 

load_and_authorize_resource :custom_model_name

Also, it will be useful for you https://github.com/CanCanCommunity/cancancan

Solution 3:[3]

Q.1 > in your example it will be @user/@users

Q.2 > use the instance_name attribute, e.g. to load @object do

load_and_authorize_resource instance_name: :object

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 roarfromror
Solution 2 AlexMrKlim
Solution 3 Ed Posnak

Related Questions