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我得到了 nil:NilClass 的未定义方法“[]”

 NoMethodError in Users::OmniauthCallbacksController#facebook

  undefined method `[]' for nil:NilClass

  Rails.root: /home/krishna/picer
  Application Trace | Framework Trace | Full Trace

  app/models/user.rb:13:in `find_for_facebook_oauth'
  app/controllers/users/omniauth_callbacks_controller.rb:4:in `facebook'

这是我的 user.rb 代码

class User < ActiveRecord::Base
# Include default devise modules. Others available are:
# :token_authenticatable, :encryptable, :confirmable, :lockable, :timeoutable:omniauthable
devise :database_authenticatable, :registerable,
     :recoverable, :rememberable, :trackable, :validatable,
     :omniauthable

# Setup accessible (or protected) attributes for your model
attr_accessible :email, :password, :password_confirmation, :remember_me

def self.find_for_facebook_oauth(access_token, signed_in_resource=nil)
data = access_token['extra']['user_hash']
if user = User.find_by_email(data["email"])
  user
else # Create a user with a stub password.
  User.create(:email => data["email"], :password => Devise.friendly_token[0,20])
  end
end

 def self.new_with_session(params, session)
  super.tap do |user|
    if data = session["devise.facebook_data"] && session["devise.facebook_data"]  ["extra"]["user_hash"]
    user.email = data["email"]
   end
  end
 end
end

和omniauth回调控制器代码

 class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController
 def facebook
 # You need to implement the method below in your model
 @user = User.find_for_facebook_oauth(request.env["omniauth.auth"], current_user)

if @user.persisted?
  flash[:notice] = I18n.t "devise.omniauth_callbacks.success", :kind => "Facebook"
  sign_in_and_redirect @user, :event => :authentication
else
  session["devise.facebook_data"] = env["omniauth.auth"]
  redirect_to new_user_registration_url
 end
end

def passthru
  render :file => "#{Rails.root}/public/404.html", :status => 404, :layout => false
 end

end

我收到错误第四行 user.rb 我为此使用了一个示例https://github.com/ryanatwork/devise-omniauth

4

1 回答 1

1

您应该使用access_token['info']['email']而不是access_token['extra']['user_hash']['email'].

我不认为其中的数据access_token['extra']遵循其他约定，因此您应该格外小心并测试您尝试访问的属性是否存在。如果您只有一个提供者，这并不重要，但如果您有多个提供者，这很重要。

于 2012-09-01T17:14:25.257 回答