RoR - NoMethodError, undefined method - ruby-on-rails

Question

I have created an app with simple login authentication, it is actually a twitter clone. The user logs in and access the pages, etc.
But when the user posts something from there profile. It gives an error
NoMethodError in RibbitsController#create
undefined method `id=' for nil:NilClass
The error is around line 5:
class RibbitsController < ApplicationController
def create
#ribbit = Ribbit.create(user_ribbits)
#ribbit.userid = current_user.id
if #ribbit.save
redirect_to current_user
else
flash[:error] = "Problem!"
redirect_to current_user
end
end
private
def user_ribbits
params.require(:ribbit).permit(:content, :userid)
end
end
The request given to app:
Request
Parameters:
{"utf8"=>"✓",
"authenticity_token"=>"dwVmjDNO4GOowphGFgChMDBxBfvka+M/xSUHvJMECzwxtv4NF6OuWtiaX74NLz91OwQJ9T9+wm7yMiPQ0BLpGA==",
"ribbit"=>{"content"=>"hi. test.\r\n"},
"commit"=>"Ribbit!"}
The sessions controller:
class SessionsController < ApplicationController
def new
end
def create
user = User.find_by_username(params[:username])
if user && user.authenticate(params[:password])
session[:userid] = user.id
redirect_to rooturl, notice: "Logged in!"
else
flash[:error] = "Wrong Username or Password."
redirect_to root_url
end
end
def destroy
session[:userid] = nil
redirect_to root_url, notice: "Logged out."
end
end
The users controller:
class UsersController < ApplicationController
def new
#user = User.new
end
def create
#user = User.create(user_params)
if #user.save
session[:user_id] = #user.id
redirect_to #user, notice: "Thank you for signing up!"
else
render 'new'
end
end
def show
#user = User.find(params[:id])
#ribbit = Ribbit.new
end
private
def user_params
params.require(:user).permit(:name, :username, :email, :password, :password_confirmation, :avatar_url)
end
end
And the application controller
class ApplicationController < ActionController::Base
protect_from_forgery with: :exception
private
def current_user
#current_user ||= User.find(session[:user_id]) if session[:user_id]
end
helper_method :current_user
end
I would really appreciate it if you guys would help!
Thanks.

Answer 1

You're trying to assign current_user.idto #ribbit.userid without ensuring that current_user is set. 'current_user' would be set only if a user has been previously saved before.
Therefore, you need either to make sure that an authenticated user is trying to create a Ribbit, or if you consider the userid as a non mandatory field, you can simply change your line 5 by:
#ribbit.userid = current_user.id unless current_user.blank?
If you only want authenticated user to create Ribbits, then consider using a gem to handle authentication such as Devise. You could then use before_filter :authenticate_user! in your controller to make sure users are properly authenticated.