|
railscast第17集017_habtm_checkboxes的例解：
rails demo -d mysql
admin -u root create demo_development
ruby script/generate model product
ruby script/generate model category
---------001_create_products.rb
class CreateProducts < ActiveRecord::Migration
def self.up create_table :products do |t| t.column :name, :string t.column :price, :decimal end end def self.down
drop_table :products end end --------002_create_categories.rb class CreateCategories < ActiveRecord::Migration
def self.up create_table :categories do |t| t.column :name, :string end create_table :categories_products , :id=>false do |t| t.column :product_id, :integer t.column :category_id, :integer end end def self.down
drop_table :categories end end 運(yùn)行
rake db:migrate
ruby script/generate product admin -f
在_form.rhtml中加入：
<p>
<% for category in Category.find(:all) %> <div> <%= check_box_tag "product[category_ids][]", category.id, @product.categories.include?(category) %> <%= category.name %> </div> <% end %> </p> 在admin_controller.rb里的update這個(gè)方法里加入：
def update
params[:product][:category_ids] ||= [] @product = Product.find(params[:id])
if @product.update_attributes(params[:product]) flash[:notice] = 'Product was successfully updated.' redirect_to :action => 'show', :id => @product else render :action => 'edit' end end |
|
|
