CODEWITHSUNDEEP
ruby-on-railsrubyruby-on-rails-3activerecord
eric3140643
eric3140643

Reputation: 5

Nest objects in ruby on rails

Hi I am working on creating a basic nest object structure in Rails and I am having some issues figuring out what direction to go in structuring things.

I want to have an object called Item related to an object called Product.

Here are the models:

class CreateItem < ActiveRecord::Migration
  def change
    create_table :items do |t|
      t.integer :product_id
      t.string :name
      t.text :description

      t.timestamps
    end
  end
end

class CreateProducts < ActiveRecord::Migration
  def change
    create_table :products do |t|
      t.string :name
      t.text :description      
      t.decimal :price
      t.string :image_file_name
      t.integer :inventory

      t.timestamps
    end
  end
end

Item always has 1 product associated with it and potentially the Product could have many referencing Items.

What I am having problems with is figuring out how to access these both within an html list easily. I know how to get access to the Item or the Product within a list, but I can figure out how to combine them within the same list and get the item.name and associated product.price in my html.erb.

Can anyone help or point me to a good example online of a similar structure in rails MVC where the model, controller and view have this all plugged in so I can see it?

Thanks in advance!

Upvotes: 0

Views: 151

Answers (1)

Donovan
Donovan

Reputation: 15917

First, your your model definitions, you'll want to set up the one-to-many association.

class Product < ActiveRecord::Base
  has_many :items
end

and

class Item < ActiveRecord::Base
  belongs_to :product
end

Given you you have instance of Item (i.e. a record from the database) stored in, let's call it, myitem, you'll use the following to get the price of the associated Product.

myitem.product.price

Upvotes: 1

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