Nested Form For Rails 3

Setup

Add it to your Gemfile then run bundle to install it.

gem "nested_form"

Next run the generator to create the JavaScript file. This will automatically detect if you are using jQuery or Prototype.

rails g nested_form:install

Running the generator will add a file at public/javascripts/nested_form.js which should be included after the jQuery or Prototype framework.

<%= javascript_include_tag :defaults, "nested_form" %>

Usage

Imagine you have a Project model that has_many :tasks. To be able to use this gem, you’ll need to add accepts_nested_attributes_for :tasks to your Project model. If you don’t have the accepts_nested_attributes_for :tasks you’ll get a Missing Block Error.

This will create a tasks_attributes= method, so you may need to add it to the attr_accessible array. (attr_accessible :tasks_attributes)

Then use the nested_form_for helper method to enable the nesting.

<%= f.fields_for :tasks do |task_form| %>
  <%= task_form.text_field :name %>
  <%= task_form.link_to_remove "Remove this task" %>
<% end %>
<p><%= f.link_to_add "Add a task", :tasks %></p>
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Interested about Ruby on Rails

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