Rails Each method Error

I know there are question with this title, but none of them solved my problem.So, i want to do this in the application.html.erb

<% @food_types.each do |ft| %>
<%= ft.name %>
<%end%>

And i have this in my application_controller.rb

@food_types = FoodType.all

Here is the migration for the FoodTypes table.

class CreateFoodTypes < ActiveRecord::Migration
  def change
    create_table :food_types do |t|
      t.string :name
      t.timestamps null: false
    end
  end
end

What should i do for this error ? undefined method `each' for nil:NilClass

default application controller

class ApplicationController < ActionController::Base 
  # Prevent CSRF attacks by raising an exception. # For APIs, you may want to use :null_session instead. protect_from_forgery with: :exception   
  @food_types = FoodType.all 
end