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ruby 代码

migration
create_table :products do |t|
  t.column :name, :string
  t.column :category_id, :integer
end

create_table :categories do |t|
  t.column :name, :string
end

10.times { |i|
  c = Category.create(:name => "Category#{i}")
  2.times { |j|
    Product.create(:name => "Product#{j}", :category => c)
  }
}

model

class Category < ActiveRecord::Base
  has_many :products
end

class Product < ActiveRecord::Base
  belongs_to :category
end


view
# option_groups_from_collection_for_select (collection, group_method, group_label_method, option_key_method, option_value_method, selected_key = nil)
# http://railsapi.masuidrive.jp/module/ActionView::Helpers::FormOptionsHelper#option_groups_from_collection_for_select

<% @categories = Category.find(:all, :include => "products") %>
<!--select-->
  <%= option_groups_from_collection_for_select(@categories, :products, :name, :id, :name) %>
<!--/select-->

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