Ruby on Rails - handling large number of abilities in ruby on rails - ruby on rails tutorial - rails guides - rails tutorial - ruby rails
- Once the number of abilities definitions start to grow in number.
- It becomes more and more difficult to handle the Ability file.
Example
Step1:
- To handle these issue is to move abilities into meaningful method.
class Ability
include CanCan::Ability
def initialize(user)
anyone_abilities
if user
if user.admin?
admin_abilities
else
authenticated_abilities
end
else
guest_abilities
end
end
private
def anyone_abilities
# define abilities for everyone, both logged users and visitors
end
def guest_abilities
# define abilities for visitors only
end
def authenticated_abilities
# define abilities for logged users only
end
def admin_abilities
# define abilities for admins only
end
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Step2:
- We can try breaking it into different classes to handle the different responsibilities.
# app/models/ability.rb
class Ability
include CanCan::Ability
def initialize(user)
self.merge Abilities::Everyone.new(user)
if user
if user.admin?
self.merge Abilities::Admin.new(user)
else
self.merge Abilities::Authenticated.new(user)
end
else
self.merge Abilities::Guest.new(user)
end
end
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Step3:
- Define those classes as:
# app/models/abilities/guest.rb
module Abilities
class Guest
include CanCan::Ability
def initialize(user)
# Abilities for anonymous visitors only
end
end
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- So on with Abilities::Authenticated, Abilities::Admin or any other else