更新用户时绕过批量分配时出现名称错误？
我按照 Railscast 教程绕过批量分配来编辑我的 <我的 User 模型的 code>role 属性为 “admin”。这就是我定义角色的方式：
class User < ActiveRecord::Base
attr_accessible :email, :password, :remember_me
attr_accessor :accessible
devise :database_authenticatable, ....etc
before_create :setup_default_role_for_new_users
ROLES = %w[admin default banned]
private
def setup_default_role_for_new_users
if self.role.blank?
self.role = "default"
end
end
def mass_assignment_authorizer
super + (accessible || [])
end
end
然后我创建了一个新的 UsersController 只是为了我的更新方法出现问题：
def update
@user = User.find(params[:id])
@user.accessible = [:role] if user.role == "admin"
if @user.update_attributes(params[:user])
redirect_to @user, :notice => "Successfully updated user."
else
render :action => 'edit'
end
end
但我不能这样做，因为这一行： if user.role = =“admin”，导致问题，给我错误：
NameError (undefined local variable or method `user' for UsersController
我在这里缺少什么？
提前致谢。
I followed the Railscast tutorial for bypassing mass assignment to edit my role attribute of my User model as the "admin". This is how I defined my roles:
class User < ActiveRecord::Base
attr_accessible :email, :password, :remember_me
attr_accessor :accessible
devise :database_authenticatable, ....etc
before_create :setup_default_role_for_new_users
ROLES = %w[admin default banned]
private
def setup_default_role_for_new_users
if self.role.blank?
self.role = "default"
end
end
def mass_assignment_authorizer
super + (accessible || [])
end
end
And then I created a new UsersController only to have issues with my update method:
def update
@user = User.find(params[:id])
@user.accessible = [:role] if user.role == "admin"
if @user.update_attributes(params[:user])
redirect_to @user, :notice => "Successfully updated user."
else
render :action => 'edit'
end
end
I can't do this though becuase this line: if user.role == "admin", is causing issue, giving me the error:
NameError (undefined local variable or method `user' for UsersController
What am I missing here?
Thanks in advance.
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通过
user.role == "admin"中的user部分，您尝试使用本地变量，该变量尚未在update< 中定义/代码> 方法。如果user没有声明为可在控制器中访问的辅助方法，那么 ruby 将找不到它。从您的代码中我假设只有管理员用户可以更新另一个用户的角色？因此，您没有使用
@user.role == "admin"而是使用user.role == "admin"？如果是这样，您必须提供一个
user对象，无论是通过辅助方法（即在您的 ApplicationHelper 类中）还是在尝试在 update 方法中使用它之前获取它，或者在 update 方法中使用 before_* 回调你的控制器。我希望我的意思很清楚。
With the
userpart inuser.role == "admin"you're trying to use a local variable, which hasn't been defined in yourupdatemethod. Ifuserisn't declared as a helper method that's accessible in your controllers then ruby won't find it.From your code I'm assuming that only an admin user can update the role of another user? Thus you're not using
@user.role == "admin"butuser.role == "admin"?If so you have to provide a
userobject whether it's through a helper method (i.e. in your ApplicationHelper class) or fetch it before you try to use it in your update method, or with a before_* callback in your controller.I hope it's clear what I meant.