rails scaffold that belongs to a Devise user model

_post.html.erb

<% # app/views/posts/_post.html.erb %>

<article>
  <h2><%= post.title %></h2>
  <!-- ... -->
</article>

index.html.erb

<% # app/views/posts/index.html.erb %>

<h1><%= current_user %>'s Posts</h1>

<% # `render @posts` knows to automatically loop through @posts and render %>
<% # app/views/posts/_post for each object in the array, with `post` as the object %>

<%= render @posts %>

post.rb

# app/models/post.rb

class Post < ActiveRecord::Base

  # ------------------------------------------ Associations

  belongs_to :user

  # ...

end

posts_controller.rb

# app/controllers/posts_controller.rb

class PostsController < ApplicationController

  # Devise method for ensuring user is logged in before accessing any of the
  # methods (actions) within this controller
  before_filter :authenticate_user!

  before_action :find_post, :only => [:show,:edit,:update,:destroy]


  def index
    # since we know the user is logged in, we now have access to the
    # `current_user` object, which the `User` object of the user that is logged
    @posts = current_user.posts
  end

  # ...

  private

    def find_post
      # by calling posts in this manner vs. `Post.find_by_id(params[:id])`, we
      # ensure we won't end up with a post belonging to another user
      current_user.posts.where(:id => params[:id]).first
    end

end

user.rb

# app/models/user.rb

class User < ActiveRecord::Base

  # ------------------------------------------ Devise

  devise :database_authenticatable, :recoverable, :rememberable, :trackable, 
         :validatable

  # ------------------------------------------ Associations

  has_many :posts

  # ...

end