Rails 4 - Displaying items from database tables - ruby-on-rails

Question

I have the following models and their associations:
#models
class Order < ActiveRecord::Base
has_many :order_items
has_many :items, :through => :order_items
accepts_nested_attributes_for :items, :order_items, :allow_destroy => true
end
class Item < ActiveRecord::Base
has_many :order_items
has_many :orders, :through => :order_items
end
class OrderItem < ActiveRecord::Base
belongs_to :item
belongs_to :order
end
I want to display the item.name, order_item.quantity and order_item.price in one table as attempted below:
<tbody>
<% #order.items.each do |item| %> <<<<<<<< need this to call item.name
<% #order.order_items.each do |order_item| %> <<<<<<< need this to call the other fields
<tr>
<td><%= item.name %></td>
<td><%= order_item.quantity %></td>
<td><%= order_item.price %></td>
</tr>
<% end %>
<% end %>
</tbody>
the above works in calling the specific field but how it is written will not do because inner loop needs to finish before outer and hence we don't get what we need.
#Tables snippets
create_table "items", force: true do |t|
t.string "name"
t.decimal "price"
t.integer "stock"
t.string "location"
t.decimal "discount"
t.boolean "status"
end
create_table "order_items", force: true do |t|
t.integer "item_id"
t.integer "order_id"
t.integer "quantity"
t.decimal "price"
end
create_table "orders", force: true do |t|
t.string "code"
t.integer "user_id"
t.text "memo"
t.boolean "status"
t.integer "client_id"
t.decimal "sub_total"
end
#orders form
<%= compact_form_for(#order) do |f| %>
<%= f.association :client, collection: Client.all, label_method: :name, value_method: :id, prompt: "Client Name", required: true %>
<%= f.simple_fields_for :items do |o| %>
<%= o.input :name, collection: Product.all, label_method: :name, value_method: :id %>
<%= o.input :quantity %>
<% end %>
<%= f.button :submit %>
<% end %>

Answer 1

You may wish to use the .delegate method with the OrderItem model, like this:
#app/models/order_item.rb
class OrderItem < ActiveRecord::Base
belongs_to :item
belongs_to :order
delegate :name, to: :item #-> allows you to call #order_item.name
end
This will allow you to call:
<tbody>
<% #order.order_items.each do |item| %>
<tr>
<td><%= item.name %></td>
<td><%= item.quantity %></td>
<td><%= item.price %></td>
</tr>
<% end %>
</tbody>
Fix
A much better way to make this work will be to use the following model names:
#app/models/product.rb
class Product < ActiveRecord::Base
has_many :items
has_many :orders, :through => :items
end
#app/models/order.rb
class Order < ActiveRecord::Base
has_many :items
has_many :products, :through => :items
accepts_nested_attributes_for :products, :allow_destroy => true
end
#app/models/item.rb
class Item < ActiveRecord::Base
belongs_to :product
belongs_to :order
delegate :name, to: :product #-> allows you to call #item.name
end
This will allow you to call:
<tbody>
<% #order.items.each do |item| %>
<tr>
<td><%= item.name %></td>
<td><%= item.quantity %></td>
<td><%= item.price %></td>
</tr>
<% end %>
</tbody>