NoMethodError en SessionsController#create al llamar a un método en el modelo de usuario

I am working on rails 3 app and using the koala gem to get a connection to the facebook graph api.I am also using omniauth to autenticate users.

Obtuve el siguiente error:

NoMethodError in SessionsController#create
undefined method `add_friends' for #<User:0x007fcfcb1a87e8>

app/models/user.rb:28:in `block in from_omniauth'
app/models/user.rb:6:in `tap'
app/models/user.rb:6:in `from_omniauth'
app/controllers/sessions_controller.rb:3:in `create'

In ruby docs it says: "Raised when a method is called on a receiver which doesn't have it defined and also fails to respond with method_missing."

But I have a metod defined, so why do I get this error? And how can I fix it?

In my SessionController I do something like this:

class SessionsController < ApplicationController
  def create
    user = User.from_omniauth(env['omniauth.auth'])
    session[:user_id] =
    redirect_to root_url, notice: "Signed in!"

Este es mi modelo de usuario:

class User < ActiveRecord::Base
  #attr_accessible :provider, :uid, :token, :email, :name, :first_name, :last_name, :image, :gender, :location, :school, :year
  has_many :friends

  def self.from_omniauth(auth)
    where(auth.slice(:provider, :uid)).first_or_initialize.tap do |user|
      user.provider = auth["provider"]
      user.uid = auth["uid"] = auth["info"]["name"]
      user.first_name = auth["info"]["first_name"]
      user.last_name = auth["info"]["last_name"]
      user.image = auth["info"]["image"] = auth["info"]["email"]
      user.gender = auth["extra"]["raw_info"]["gender"]
      user.location = auth["extra"]["raw_info"]["location"]["name"]          
      user.token = auth["credentials"]["token"]



    def add_friends
      @facebook.get_connections("me", "friends").each do |hash|
        self.friends.find(:name => hash['name'], :uid => hash['id']).first_or_create


    def facebook
      @facebook ||=

preguntado el 30 de junio de 12 a las 21:06

1 Respuestas

En el código que publicaste def add_friends is actually inside your from_omniauth class method and so ends up being a class method too, rather than an instance method.

Move that (and the facebook method) out of there and you should be ok. You probably also want to be calling your facebook method rather than accessing the instance variable directly.

Respondido el 30 de junio de 12 a las 22:06

can you please show me, I moved the method like this: and now I get a for get_connections insted: undefined method `get_connections' for nil:NilClass - user592638

Estas usando @facebook without setting it. Do facebook.get_connections(...) en lugar de - Federico Cheung

Then I get: undefined local variable or method `facebook' for #<User:0x007ff4a1760ff0> - user592638

you also need to move the Facebook method out of that class method - Federico Cheung

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