Artists Group_by nested attribute Order_date - ruby

Question

I have created a functioning e-commerce platform where Members can buy songs. Everything works fine, But I would like to group all of my Orders in my Index Page by Month.
Currently I am able to group each Album with its corresponding Artist, and each Ordered Song to its corresponding Album. But now I would like to group Orders by Month.
How Can I Group Artists by the order_date in my Orders Table, So that everything is organized by Month?
Ex. of what I've like to do
Month 1 Orders
Artist1
Album1 ###List of Albums Corresponding to an Artist
--Song1 (10 0rders)
--Song3 (5 Orders)
Album2
--Song5 (2 Orders) ###Ordered Songs Corresponding to an Album
Month 2 Orders
Artist2
Album1
--Song2 (1 Order)
Artist3
Album3
--Song5 (1 Order)
MODELS
class Order < ActiveRecord::Base
attr_accessible :artist_id, :album_id, :song_id, :user_id, :order_date
belongs_to :song
belongs_to :user
end
class Artist < ActiveRecord::Base
attr_accessible :name
has_many :albums
has_many :songs, :through => :albums
has_many :orders, :through => :songs
end
class Album < ActiveRecord::Base
attr_accessible :name, :artist_id
belongs_to :artist
has_many :songs
has_many :orders, :through => :songs
end
class Song < ActiveRecord::Base
attr_accessible :artist_id, :album_id, :title, :price
belongs_to :album
has_many :orders
end
CONTROLLERS
###How Can I Group Artists by the order_date in my Orders Table?
def index
#artists = Artist.includes(:orders).where('orders.id IS NOT NULL')
end
VIEWS
<% #artists.each do |artist| %> ###Lists All Artists with Orders
<h3><%= artist.name %></h3>
<% artist.albums.each do |album| %> ###Lists All Albums corresponding to Artist
<h4><%= album.name %></h4>
<% album.songs.each do |song| %> ###Lists All Ordered Songs corresponding to Albums
<% if song.orders.count >= 1 %>
(<%= song.orders.count %>)
<%= song.title %>
$<%= song.price %><br>
<% end %>
<% end %>
<% end %>
<% end %>

Answer 1

You get the list of orders ok with this line:
<% #order_months.sort.each do |month, orders| %>
But then you jump back into your full list of artists with this line:
<% #artists.each do |artist| %> ###Lists All Artists with Orders
Instead I think you need something like
<% orders.each do |order| %>
<% order.artists.each do |artist| %>
<% artist.albums.each do |album| %>
<% album.songs.each do |song| %>
<%= song.name %>
To get order.artists you will need to modify your model:
class Order < ActiveRecord::Base
attr_accessible :artist_id, :album_id, :song_id, :user_id, :order_date
belongs_to :song
belongs_to :user
has_many :albums, through: :song
has_many :artists, through: :albums
end

Answer 2

This is how I ended up Solving the Problem
Controller
#orders = Order.find(:all, :order => 'order_date, id', :limit => 50)
Views
<% #orders.sort.group_by { |order| order.order_date.beginning_of_month }.each do |month, orders| %>
<h3><%= month.strftime('%B') %> </h3>
<% orders.group_by { |order| order.song.album.artist }.each do |artist, orders| %>
<h4><%= artist.name %> </h4>
<% orders.group_by { |order| order.song.album }.each do |album, orders| %>
<h5><%= album.name %> </h5>
<% orders.group_by { |order| order.song }.each do |song, orders| %>
<p>(<%= orders.count %>) <%= song.title %> </p>
<p><%= song.price %> </p>
<% end %>
<% end %>
<% end %>
<% end %>