强参数不接受数组

Question

我在我的视图中有这个多选复选框

模型

class User < ActiveRecord::Base
  has_many :user_roles, :dependent => :destroy
  accepts_nested_attributes_for :user_roles, :allow_destroy => true
  has_many :roles, :through => :user_roles
end

视图

<%= check_box_tag 'user[role_ids][]', role.id, user.blank? ? nil : user.roles.include?(role) ,id: dom_id(role)%>

这个强大的参数写成

  def user
    params.require(:user).permit(:first_name,{:role_ids => []})
  end

但在创造它说

Processing by Admin::UsersController#create as HTML
  Parameters: {"utf8"=>"?", "authenticity_token"=>"+y8iWya5KIILqS0embEUEZuClycXq0O9Q4pA+MnbM0g=", "user"=>{"first_name"=>"", "last_name"=>"", "email"=>"a@loclahost.com", "language"=>"en", "access_level_id"=>"1", "role_ids"=>["", "1", "", "5", "", "", ""], "password"=>"[FILTERED]", "password_confirmation"=>"[FILTERED]"}, "commit"=>"Create user"}

Unpermitted parameters: role_ids
Unpermitted parameters: role_ids
Unpermitted parameters: role_ids
Unpermitted parameters: role_ids

任何线索为什么它不接受来自表单的role_ids数组？

Answer 1

请参阅有关嵌套属性的Rails 强参数文档.

正确的格式是:

params.permit(:name, {:roles => []}, ...)

AnkitG的解决方案在Rails 4中使用Role Model gem为我的用户模型工作.我的用户控制器_params的实现最终看起来像:

def user_params
  # Bug with permit for nested arrays... @see https://stackoverflow.com/a/17880288/2631472
  params.require(:user).permit(:first_name, :last_name, :middle_name).tap do |whitelisted|
    whitelisted[:roles] = params[:user][:roles]
  end
end

Answer 2

这应该工作

params.require(:user).permit(:first_name, :role_ids => [])

Answer 3

回答我自己,我没有直接工作,但强参数问题讨论中的以下方法帮助我将正常参数转换为白名单参数.

def user_params
  params.require(:user).permit(:first_name).tap do |whitelisted|
    whitelisted[:role_ids] = params[:user][:role_ids]
  end
end