I am trying to create a very simple order & customer tracking system with Customer, Products and Orders. I am having challenges getting my head around how to code to setup the many-to-many relationship between Orders and Products. Here are some code snippets to show how things are setup.
customer.rb
class Customer < ActiveRecord::Base
has_many :orders
end
product.rb
class Product < ActiveRecord::Base
has_and_belongs_to_many :orders
end
order.rb
class Order < ActiveRecord::Base
belongs_to :customer
has_and_belongs_to_many :products
end
DB Migration - Products
class CreateProducts < ActiveRecord::Migration
def self.up
create_table :products do |t|
t.string :title
t.string :image_url
t.decimal :price, :precision => 8, :scale => 2
t.timestamps
end
end
def self.down
drop_table :products
end
end
DB Migration - Customers
class CreateCustomers < ActiveRecord::Migration
def self.up
create_table :customers do |t|
t.string :first_name
t.string :last_name
t.string :email
t.string :twitter
t.timestamps
end
end
def self.down
drop_table :customers
end
end
DB Migration - Orders
class CreateOrders < ActiveRecord::Migration
def self.up
create_table :orders do |t|
t.timestamp :date
t.decimal :total
t.integer :customer_id
t.timestamps
end
end
def self.down
drop_table :orders
end
end
DB Migration - Orders & Products Join
class CreateOrderProductJoinTable < ActiveRecord::Migration
def self.up
create_table :orders_products, :id => false do |t|
t.integer :product_id
t.integer :order_id
end
end
def self.down
drop_table :orders_products
end
end
seeds.rb
#-------------------
CREATE PRODUCTS
#-------------------
Product.delete_all
Product.create(
:title => ‘Liftoff’,
:image_url => 'http://joeworkman.net/depot/products/liftoff/liftoff-78.png’,
:price => 9.95)
Product.create(
:title => ‘Expose’,
:image_url => 'http://joeworkman.net/depot/products/expose/expose-78.png’,
:price => 14.95)
Product.create(
:title => ‘Comments’,
:image_url => 'http://joeworkman.net/depot/products/comments/comments-78.png’,
:price => 4.95)
#-------------------
CREATE CUSTOMERS
#-------------------
Customer.delete_all
Customer.create(
:first_name => ‘Joe’,
:last_name => ‘Workman’,
:email => ‘joe@workmanmail.com’,
:twitter => ‘joeworkman’)
#-------------------
CREATE ORDERS
#-------------------
Order.delete_all
Order.create(
:date => Time.now,
:customer_id => 1)
So my questions are….
- Is this setup looking correct?
- How can I seed orders with multiple products?
- What would my New order creation method look like? Similar to the seed function?
