<div>
  <aside class="col-md-4">
    <div>
      <h1>My Profile</h1>
    </div>
    <div class="hero-unit user_info">
      <h1><%= @user.name %></h1>
      <h2><%= pluralize(@user.cars.count, "Car") %></h2>
    </div>
  </aside>

  <div class="col-md-8">
    <h1>My Cars</h1>
  </div>
  <div class="col-md-8">
    <div id="car_feed">
        <ul class="cars">
          <%= render @feed_items %>  //problem point
        </ul>
</div>
  </div>
</div>

class User < ActiveRecord::Base
  has_many :cars
  attr_accessor :remember_token
  before_save { self.email = email.downcase }
  validates :name,  presence: true, length: { maximum: 50 }
  VALID_EMAIL_REGEX = /A[w+-.]+@[a-zd-.]+.[a-z]+z/i
  validates :email, presence: true, length: { maximum: 255 },
                    format: { with: VALID_EMAIL_REGEX },
                    uniqueness: { case_sensitive: false }
  has_secure_password
  validates :phone, presence:true
  validates :password, length: { minimum: 6 }, allow_blank: true

.
.
.

  def feed
    Car.where("user_id = ?", id)
  end
end

def home
    if logged_in?
      @car = current_user.cars.build
      @feed_items = current_user.feed.paginate(page: params[:page])
    end
  end
end