Slow Your Roles

Simple rails gem for basic role authorization with ruby on rails.

This gem has been cloned from Easy Roles due to owner no longer supporting or maintaining that library. Since we cannot publish this gem to rubygems under that name we renamed the library.

Please read the CHANGELOG.md file.

gem install slow_your_roles

Add the following to your Gemfile:

gem 'slow_your_roles'

Then generate the migration:

rails g slow_your_roles user roles

Or add a roles column to your users model, and set the default value to --- []. Please note you can call this column anything you like, I like to use the name "roles".

t.string :roles, default: "--- []"

Then you need to add slow_your_roles :column_name to your model:

  class User < ActiveRecord::Base
    slow_your_roles :roles
  end

Add the following to your Gemfile:

gem 'slow_your_roles'

Then generate the migration:

rails g slow_your_roles user roles --use-bitmask-method

Or add a roles_mask column to your users model of type integer, and set the default value to 0. Please note you can call this column anything you like, I like to use the name "roles_mask":

t.integer :roles_mask, default: 0

Add slow_your_roles :column_name, method: :bitmask to your model:

class User < ActiveRecord::Base
  slow_your_roles :roles_mask, method: :bitmask
end

And lastly you need to add a constant variable which stores an array of the different roles for your system. The name of the constant must be the name of your column in full caps.

class User < ActiveRecord::Base
  slow_your_roles :roles_mask, method: :bitmask
  
  # Constant variable storing roles in the system
  ROLES_MASK = %w[admin moderator user].freeze
end

Slow your roles extends your model, and adds a few methods needed for basic role authorization.

adding a role to a user

add_role 'role'

adding multiple roles at the same time to a user

add_roles 'admin', 'manager'

removing a role from a user

remove_role 'role'

check to see if a user has a certain role

has_role? 'role'
# or
is_role? # role being anything you like, for example 'is_admin?' or 'is_awesome?'

For every method above there is a bang method too.

  add_role! 'role'
  add_roles! 'admin', 'manager'
  remove_role! 'role'

@user = User.first

@user.add_role 'admin'

@user.is_admin?
=> true

@user.has_role? 'admin'
=> true

@user.is_awesome?
=> false

@user.add_role 'awesome'

@user.is_awesome?
=> true

@user.remove_role 'admin'

@user.is_admin?
=> false

etc etc

There are many ways to implement views for specific roles, so I did not specifically supply one. Here's an example on what you could do:

class ApplicationController < ActionController::Base
  def admin_required
    unless current_user && current_user.is_admin?
      flash[:error] = "Sorry, you don't have access to that."
        redirect_to root_url and return false
    end
  end
end

Then in your AdminsController or any controller that you only want admins to view:

class AdminsController < ApplicationController
   before_filter :admin_required
end

class MarksController < ApplicationController
   before_filter :admin_required, only: %w(create update)
end

By default, slow_your_roles adds the with_role scope to your models.

  @admins = User.with_role('admin')

If you're using the bitmask method, an ArgumentError will be thrown if an undeclared scope is queried. Since an ActiveRecord::Relation is returned, the query is chainable:

  BitmaskUser.with_role('admin').where(active: true).to_sql
  # => SELECT "bitmask_users".* FROM "bitmask_users" WHERE "bitmask_users"."roles_mask" IN (1, 3, 5, 7) AND "bitmask_users"."active" = 't'
  
  SerializeUser.with_role('admin').where(active: true).to_sql
  # => SELECT "serialize_users".* FROM "serialize_users" WHERE "serialize_users"."active" = 't' AND (serialize_users.roles LIKE '%!admin!%')

slow_your_roles also supports a without_role scope.

@non_admins = User.without_role('admin')

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Copyright (c) 2020 Platform45

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