Question

I want to make a rollOver menu for my project’s main page. This will be shown in all pages of the site. Main menu items are SHOWS and PROGRAMS. When someone rolls over those buttons, all programmes will be listed inside a popping up div. (Program is name of my model and it’s a general name I use for both shows, movies, tv programs etc.)

Now…

Here are my associations:

Program.rb

class Program 
  include Mongoid::Document
  include Mongoid::Timestamps

  field :title
  field :content

  belongs_to :program_category

end

program_category.rb

  class ProgramCategory 
    include Mongoid::Document
    include Mongoid::Timestamps

    field :title
    field :content

    has_many :programs

  end

I need to get program.titles to show inside my menu. Like this:

SHOWS         PROGRAMS
  \- Lost        \- Ellen
  \- Dexter      \- Marta Stuart
  \- Alf         \- Jey Leno Show

Well… I’m doing this like this now:

home_controller.rb

class HomeController < ApplicationController

 def index
     @menu_programs = Program.all.where(program_category_id: "50a7c373ce3a6bcc0a000006").limit(10)    #Yes, i think it's lame too...
     @menu_shows = Program.all.where(program_category_id: "50a67f36ce3a6b840d000007").limit(10) # And yes I'm using MonoDB and Mongoid
  end

Yeah… They are program_category_ids and very hard coded!!

I feel like…

This is not the best practice!

QUESTION is:

What is best practice to show menu items from associated models? I heard somethign called ‘Eager Loading’ can someone explain it please? Because of n + 1 problem I have 36 queries…

Any suggestion is welcomed.

Thank you.

Answer 1

The answer of What is best practice to show menu items from associated models? question is:

Using Fragment Caching, I think. It’s even more essential than eager loading IMHO.