undefined method `[]' for nil:NilClass railstutorial.org 8.20 > - ruby-on-rails-4

Question

I'm following the rails-tutorials from Michael Hartl, it's really fun !
but i'm having troubles from upon listing 8.20 and so on.
Cause i guessed i had made a type-o i erased the app and started from scratch again..
The best way to learn is repeat right ?
Well.. also on the second build i got the same error.
> NoMethodError in SessionsController#create
undefined method `[]' for nil:NilClass
Extracted source (around line #7):
6 def create
7 user = User.find_by(email: params[:session][:email].downcase)
8 if user && user.authenticate(params[:session][:password])
9 sign_in user
10 else
after googling for a few hours i tried resetting the db ( drop / create / migrate test:prepare)
i have tried copying pieces of code out of the example (e.g. controllers/helpers/views)
but I cant seem to find the solution.
Here is the code for
session_controller:
class SessionsController < ApplicationController
def new
end
def create
user = User.find_by(email: params[:session][:email].downcase)
if user && user.authenticate(params[:session][:password])
sign_in user
else
flash.now[:error] = 'Invalid email/password combination'
render 'new'
end
end
def destroy
end
end
session helper:
module SessionsHelper
def sign_in(user)
remember_token = User.new_remember_token
cookies.permanent[:remember_token] = remember_token
user.update_attribute(:remember_token, User.encrypt(remember_token))
self.current_user = user
end
def signed_in?
!current_user.nil?
end
def current_user=(user)
#current_user = user
end
def current_user
remember_token = User.encrypt(cookies[:remember_token])
#current_user ||= User.find_by(remember_token: remember_token)
end
def current_user?(user)
user == current_user
end
def sign_out
current_user.update_attribute(:remember_token,
User.encrypt(User.new_remember_token))
cookies.delete(:remember_token)
self.current_user = nil
end
end
User model
class User < ActiveRecord::Base
before_save {self.email = email.downcase }
before_create :create_remember_token
validates :name, presence: true, length: { maximum: 50 }
VALID_EMAIL_REGEX = /\A[\w+\-.]+#[a-z\d\-.]+\.[a-z]+\z/i
validates :email, presence: true, format: { with: VALID_EMAIL_REGEX},
uniqueness: {case_sensetive: false}
has_secure_password
validates :password, length: { minimum: 3 }
def User.new_remember_token
SecureRandom.urlsafe_base64
# SecureRandom.urlsafe_base64
end
def User.encrypt(token)
Digest::SHA1.hexdigest(token.to_s)
end
private
def create_remember_token
self.remember_token = User.encrypt(User.new_remember_token)
end
end
user controller
class UsersController < ApplicationController
def new
#user = User.new
end
def show
#user = User.find(params[:id])
end
def create
#user = User.new(user_params)
if #user.save
flash.now[:succes] = "Welcome to the sample app"
redirect_to #user
else
render 'new'
end
end
private
def user_params
params.require(:user).permit(:name, :email, :password,
:password_confirmation)
end
end
and the user helper
module UsersHelper
# Returns the Gravatar (http://gravatar.com/) for the given user.
def gravatar_for(user, options = { size: 50 })
gravatar_id = Digest::MD5::hexdigest(user.email.downcase)
size = options[:size]
gravatar_url = "https://secure.gravatar.com/avatar/#{gravatar_id}?s=#{size}"
image_tag(gravatar_url, alt: user.name, class: "gravatar")
end
end
how can i properly copy-paste the error log ?

Answer 1

Based on the error you're getting, the problem is clearly somewhere in your Users controller:
def create
user = User.find_by(email: params[:session][:email].downcase)
if user && user.authenticate(params[:session][:password])
sign_in user
else
flash.now[:error] = 'Invalid email/password combination'
render 'new'
end
end
The error is being generated because params[:session] is, in fact, nil. Now the question is, why?
My guess is that you have a typo in your sign_in form, it should be:
<%= form_for(:session, url: sessions_path) do |f| %>
<%= f.label :email %>
<%= f.text_field :email %>
<%= f.label :password %>
<%= f.password_field :password %>
<%= f.submit "Sign in", class: "btn btn-large btn-primary" %>
<% end %>
Please make sure :session is typed correctly.