我的环境：ruby:2.0.0p0, rails:3.2.13, cancan: 1.6.10, devise: 2.2.4
嗨，当我关注 cancan 的 wiki分离角色模型时，它似乎对我不起作用？当我调试能力时，我发现以下内容：
2.0.0-p0 :002 > q = Question.first
Question Load (0.1ms) SELECT "questions".* FROM "questions" LIMIT 1
=> #<Question id: 1, title: "问题", created_at: "2013-05-14 11:14:31", updated_at: "2013-05-14 11:14:31", content: "答案", user_id: nil>
user_id是nil。_
我已经添加user_id and role_id到分配表、question_id用户表user_id和问题表。
role.rb
class Role < ActiveRecord::Base
attr_accessible :name
# has_and_belongs_to_many :users
has_many :assignments
has_many :users, :through => :assignments
end
赋值.rb
class Assignment < ActiveRecord::Base
# attr_accessible :title, :body
belongs_to :user
belongs_to :role
end
用户.rb
class User < ActiveRecord::Base
# Include default devise modules. Others available are:
# :token_authenticatable, :confirmable,
# :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
# Setup accessible (or protected) attributes for your model
attr_accessible :email, :password, :password_confirmation, :remember_me, :username, :profile
# attr_accessible :title, :body
has_many :assignments
has_many :roles, :through => :assignments
has_many :questions
def has_role?(role_sym)
roles.any? { |r| r.name.underscore.to_sym == role_sym }
end
end
能力.rb
class Ability
include CanCan::Ability
def initialize(user)
if user.blank?
cannot :manage, :all
can :read, Question
elsif user.has_role?(:admin)
can :manage, :all
else
can :create, Question
can :update, Question, :active => true, :user_id => user.id
can :destroy, Question, :active => true, :user_id => user.id
end
end
end
和观点：
<% if can? :update, @question %>
<%= link_to 'Edit', edit_question_path(question), :method => :get, :class => "btn btn-mini btn-warning" %>
<% end %>
然后当我创建一个问题但它没有edit按钮时。我怎么了？如果您需要更多信息，请告诉我。