Rails : Associating has_many relationships

bootstrap has_many associationproduct category model has_many association

we’ll start with a new App and we’ll generate a scaffold product model and category model, following this bellow:

rails g scaffold Product name:string price:decimal
rails g scaffold Category name:string
rails g migration add_category_id_to_products category_id:integer

don’t forget

rake db:migrate

in category model

class Category < ActiveRecord::Base
  has_many :product
  attr_accessible :name

next in Product Model

class Product < ActiveRecord::Base
  belongs_to :category
  attr_accessible :name, :price, :category_id

finally, edit your code in app/views/product model, in index.html.erb and show.html.erb

<%= @product.category_id %>

which become

<%= @product.category.name %>

and specially

<div class="control-group">
      <%= f.label :category_id, :class => 'control-label' %>
      <div class="controls">
        <%= f.collection_select :category_id, Category.all, :id, :name %>

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