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Ruby

alborz
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alborz
Full Stack JavaScript Techdegree Graduate 30,885 Points
Posted by alborz
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alborz
Full Stack JavaScript Techdegree Graduate 30,885 Points

Getting undefined method `email' for nil:NilClass error when rendering post.user.email in index.html.haml view

I'm getting an undefined method `email' for nil:NilClass when rendering post.user.email in my index.html.haml view. I was able to render post.user successfully, but began to get the error when refreshing the application after adding post.user.email.

Posts controller:

class PostsController < ApplicationController
  before_action :find_post, only: [:show, :edit, :update, :destroy]

  def index
    @posts = Post.all.order("created_at DESC")
  end

  def show
  end

  def new
    @post = current_user.posts.build
  end

  def create
    @post = current_user.posts.build(post_params)

    if @post.save
      redirect_to @post
    else
      render 'new'
    end
  end

  def edit
  end

  def update
    if @post.update(post_params)
      redirect_to @post
    else
      render 'edit'
    end
  end

  def destroy
    @post.destroy
    redirect_to root_path
  end

  private

  def find_post
    @post = Post.find(params[:id])
  end

  def post_params
    params.require(:post).permit(:title, :content)
  end
end

index.html.haml:

- @posts.each do |post|
  %h2= link_to post.title, post
  %p
    Published at
    = time_ago_in_words(post.created_at)
    by
    = post.user.email

= link_to "New Post", new_post_path

post.rb:

class Post < ActiveRecord::Base
  belongs_to :user
end

user.rb (devise):

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable
  has_many :posts
end

Here is the GitHub repository: https://github.com/amesbahi/Forum

Thanks!

1 Answer

Salman Akram
PLUS
Salman Akram
Courses Plus Student 40,065 Points
Salman Akram
Salman Akram
Courses Plus Student 40,065 Points

Hi Alborz,

Alborz Mesbahi , can you update your repo? I found only first initial commit in your github.

Salman Akram
Salman Akram
Courses Plus Student 40,065 Points

Alborz Mesbahi , really, what error message says? migration pending?

alborz
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.a{fill-rule:evenodd;}techdegree seal-36
alborz
Full Stack JavaScript Techdegree Graduate 30,885 Points
alborz
.a{fill-rule:evenodd;}techdegree seal-36
alborz
Full Stack JavaScript Techdegree Graduate 30,885 Points

Salman Akram , it says the same error message as the original, and highlights line 7 of the index.html.haml file (post.user.email).

Also the main error message up top of the web app says: NoMethodError in Posts#index.

Salman Akram
Salman Akram
Courses Plus Student 40,065 Points

Strange, I didn't get error message, I am able to create new post successfully and it also shown email address along with time under index.html.haml without any issue.