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Editorial Team
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Asked: 2026-06-06T17:59:20+00:00

How do one handle facebook user that dont provide some value? I am using

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How do one handle facebook user that dont provide some value? I am using the koala gem and omniauth.

I get the following error: 

NoMethodError in SessionsController#create
undefined method `[]' for nil:NilClass

app/models/user.rb:14:in `block in from_omniauth'
app/models/user.rb:5:in `tap'
app/models/user.rb:5:in `from_omniauth'
app/controllers/sessions_controller.rb:3:in `create'

And I get this error because the facebook user my app is trying to autenticate dosent have some data values that my app want, like location, education history etc..

A new user process, beging in the SessionsController: 

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

Then in the user model:

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


    # highschool data
    user.highschool_name = auth["extra"]["raw_info"]["education"][0]["school"]["name"] if (!auth["extra"].blank? && !auth["extra"]["raw_info"]["education"][0]["school"].blank?)
    user.highschool_year = auth["extra"]["raw_info"]["education"][0]["year"]["name"] if (!auth["extra"].blank? && !auth["extra"]["raw_info"]["education"][0]["year"].blank?)
    # graduate school data
    user.graduateschool_name = auth["extra"]["raw_info"]["education"][1]["school"]["name"] if (!auth["extra"].blank? && !auth["extra"]["raw_info"]["education"][1]["school"].blank?)
    user.graduateschool_year = auth["extra"]["raw_info"]["education"][1]["year"]["name"] if (!auth["extra"].blank? && !auth["extra"]["raw_info"]["education"][1]["year"].blank?)

  user.add_friends
  user.save!
      user
 end 
end
end
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1 Answer

  1. Editorial Team

    the error is in line 14 for you User model file like for example if auth["credentials"] is nil auth["credentials"]["token"] will give the same error you got.

    Put checks in line when you assigning the values, e.g., user.token = auth["credentials"]["token"] unless auth["credentials"].blank?

    UPDATE

      user.first_name = auth["info"]["first_name"] unless auth["info"].blank?
  user.last_name = auth["info"]["last_name"] unless auth["info"].blank?
  user.image = auth["info"]["image"] unless auth["info"].blank?
  user.email = auth["info"]["email"] unless auth["info"].blank?
  user.gender = auth["extra"]["raw_info"]["gender"] if (!auth["extra"].blank? && !auth["extra"]["raw_info"].blank?)
  user.location = auth["extra"]["raw_info"]["location"]["name"] if (!auth["extra"].blank? && !auth["extra"]["raw_info"].blank? && !auth["extra"]["raw_info"]["location"].blank?)
  user.token = auth["credentials"]["token"] unless auth["credentials"].blank?
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