小编Bej*_*rge的帖子

我已经按照本教程(http://railscasts.com/episodes/236-omniauth-part-2)使用OmniAuth和Devise创建facebook登录,我收到此错误:在我的路由中自动加载常量用户时检测到循环依赖性. RB

  devise_for :users , :controllers => {:registrations => 'registrations'}

registrations_controller.rb

Class RegistrationsController < Devise::RegistrationsController

  def create
    super
    session[:omniauth] = nil unless @user.new_record?
  end

  private

  def build_resource(*args)
    super
    if session["devise.omniauth"]
      @user.apply_omniauth(session["devise.omniauth"])
      session["devise.omniauth"] = nil
   end
  end
end

这是来自AuthenticationsController的我的创建方法

def create
    omniauth = request.env["omniauth.auth"]
    authentication = Authentication.find_by_provider_and_uid(omniauth['provider'], omniauth['uid'])
    if authentication
      flash[:notice] = "Signed in successfully."
      sign_in_and_redirect(:user, authentication.user)
    elsif current_user
      current_user.authentications.create!(:provider => omniauth['provider'], :uid => omniauth['uid'])
      flash[:notice] = "Authentication successful."
      redirect_to authentications_url
    else
      user = User.new
      user.apply_omniauth(omniauth)
      if user.save
        flash[:notice] …

我正在使用RailsAdmin,我正在尝试在管理面板中添加指向存储在AWS上的视频的链接.

field :license do
    formatted_value do
      link_to 'license', value
    end
  end
  field :insurance do
    formatted_value do
      link_to 'insurance', value
    end
  end
  field :registration do
    formatted_value do
      link_to 'registration', value
    end
  end
  field :interview do
    pretty_value do
      link_to 'Download video', value.url
    end
  end

这是我正在尝试配置的部分的rails_admin.rb(配置文件).前3个字段有效,但在INTERVIEW字段中我得到了

undefined method `link_to' for #<RailsAdmin::Config::Fields::Types::String:0xc83a7f0>

您有什么建议可以在该领域获得链接吗？

谢谢!