Rails Koala - Getting a undefined method `oauth_token=' for #<User: - ruby-on-rails

Question

Apologies for the beginner question. I'm trying to use the Koala gem on my app. Currently, I have devise and omniauth (for facebook login). And they work great - I'm able to register users easily. What I want to do now though is utilize Koala to get access to Facebook data from my logged in Users. However, I'm getting an error "undefined method `oauth_token=' for #
User.rb
class User < ApplicationRecord
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable, :omniauthable, omniauth_providers: [:facebook]
def self.from_omniauth(auth)
where(provider: auth.provider, uid: auth.uid).first_or_create do |user|
user.email = auth.info.email
user.password = Devise.friendly_token[0,20]
user.username = auth.info.name
user.avatar = URI.parse(auth.info.image)
user.oauth_token = auth.credentials.token #Added this after learning about Koala
end
end
def facebook
#facebook ||= Koala::Facebook::API.new(oauth_token)
end
end
Application_Controller.rb
class ApplicationController < ActionController::Base
protect_from_forgery with: :exception
before_action :configure_permitted_parameters, if: :devise_controller?
before_filter :set_body_class
before_filter :set_current_user
def set_current_user
User.current_user = current_user
end
def set_body_class
#body_class = "#{controller_name} #{action_name}"
end
protected
def after_sign_in_path_for(resource)
# request.env['omniauth.origin'] || stored_location_for(resource) || root_path
items_path
end
def configure_permitted_parameters
devise_parameter_sanitizer.permit(:sign_up, keys: [:username, :name, :avatar])
devise_parameter_sanitizer.permit(:account_update, keys: [:username,:name, :avatar])
end
end
Schema.rb
create_table "users", force: :cascade do |t|
t.string "email", default: "", null: false
t.string "encrypted_password", default: "", null: false
t.string "reset_password_token"
t.datetime "reset_password_sent_at"
t.datetime "remember_created_at"
t.integer "sign_in_count", default: 0, null: false
t.datetime "current_sign_in_at"
t.datetime "last_sign_in_at"
t.string "current_sign_in_ip"
t.string "last_sign_in_ip"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "avatar_file_name"
t.string "avatar_content_type"
t.integer "avatar_file_size"
t.datetime "avatar_updated_at"
t.string "username"
t.string "provider"
t.string "uid"
t.index ["email"], name: "index_users_on_email", unique: true
t.index ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true
end
Migration AddOmniauthToUsers
class AddOmniauthToUsers < ActiveRecord::Migration[5.0]
def change
add_column :users, :provider, :string
add_column :users, :uid, :string
end
end

Answer 1

Try and call self.outh_token. outh_token belongs to a user and unless you pass a user as a parameter or call it on itself using "self", Rails doesn't know where outh_token belongs to.
def facebook
#facebook ||= Koala::Facebook::API.new(self.oauth_token)
end
or
def facebook(user)
#facebook ||= Koala::Facebook::API.new(user.oauth_token)
end