SimpleRoles is a Rails Engine providing simple Role System for any Rails 3 app.
Initially it was created as demo role-system to accompany CanTango gem initial installiation and usage, and intended to be very easy to setup & use.
Now it is good to be used as a real role system inspite of or due to its almost maximum simplicity.
- Ruby 1.8.7 or 1.9.3
- Rails 3
- ActiveRecord with MySQL or SQLite
Usermodel in your Rails app.
It is a Gem
include in Gemfile:
Set up valid roles you're gonna have in your app and choose a Strategy.
Create file simple_roles.rb in config/initializers and write in it:
# config/initializers/simple_roles.rb . do |config| config.valid_roles = [:user, :admin, :editor] config.strategy = :many # Default is :one end
or in a nicer way:
# config/initializers/simple_roles.rb . do valid_roles :user, :admin, :editor strategy :many # Default is :one end
Now it is time to choose beetween two strategies possible:
- One - each of your users has only one role. It is the most common choice for the most of the apps.
- Many - your user can be :editor and :curator and :instructor all at the same time. More rare one, setup is slightly more complex.
One strategy assumes your User model has string-typed 'role' column. Add this to your migrations and run them:
class CreateUsers < ActiveRecord::Migration def up create_table(:users) do |t| # ... t.string :role end end def down drop_table :users end end
Finally, include 'simple_roles' macros in your User model:
class User simple_roles end
In its background 'Many' strategy has following setup, based on has_many :through relations:
class User < ActiveRecord::Base has_many :user_roles has_many :roles, :through => :user_roles end class < ActiveRecord::Base belongs_to :user belongs_to :role end class < ActiveRecord::Base has_many :user_roles has_many :users, :through => :user_roles end
You don't need to create these classes (UserRoles, Roles) and write these associations by hands - all these classes SimpleRoles configures automatically. The only class you need is User and you must have simple_roles in it (see below).
But you need to supply migrations for them - copy and migrate SimpleRoles migrations by following rake task:
rake simple_roles_engine:install:migrations rake db:migrate
Note! Migrations are based on roles you are to set up as valid (see previous step). If you do not create initializer with valid_roles, then valid_roles will be set up to defaults: :user and :admin.
And finally include 'simple_roles' macros in your User model:
class User simple_roles end
You can skip configuration in initializers and write it the following way:
class User simple_roles do strategy :one valid_roles :user, :editor end end
user = User.create user.role # => nil user.role = :admin user.role # => :admin user.admin? # => true user.is_admin? # => true user.has_role? :admin # => true user.has_role? :user # => false user.has_any_role? :user, :editor, :admin # => true # Accepts strings too user.role = 'instructor' user.role # => :instructor # #set_role and #update_role are persistent - #save is called also user.set_role(:editor) user.reload user.role # => :editor user.update_role(:user) user.reload user.role # => :user
user = User.new user.roles # =>  user.roles = :admin user.roles # => [:admin] user.roles_list # => [:admin] user.admin? # => true user.is_admin? # => true user.roles = [:admin, :user] user.roles # => [:admin, :user] user.is_user? # => true user.add_role :editor user.roles # => [:admin, :user, :editor] user.remove_role :user user.roles # => [:admin, :editor] user.has_role?(:admin) # => true user.has_any_role?(:admin, :blip) # => true user.has_role?(:blogger) # => false
For each of valid roles both strategies automatically define scope methods in User model:
..valid_roles # => [:user, :admin, :editor] User.users # =>  User.admins # =>  User.editors # => 
Copyright (c) 2012 Stanislaw Pankevich.