ruby-on-rails - rails 4 : Conditional check set of values returned via many to many association

Question

我的应用程序有一个用户模型、角色模型和分配模型。通过分配模型，用户和角色模型之间存在多对多关系。我想检查当前用户是否有特定的 role_id。这有办法吗？

我的模型类如下

class User < ActiveRecord::Base
  has_many :assignments
  has_many :roles, :through => :assignments
end

class Assignment < ActiveRecord::Base
  belongs_to :user
  belongs_to :role
end

class Role < ActiveRecord::Base
  has_many :assignments
  has_many :users, :through => :assignments
end

Answer 1

current_user.role_ids.include?(role_id)