This gem is an easy way to use nested fields with jQuery in your Rails app.
Include the gem in your Gemfile gem 'ajax-nested-fields'
Install it bundle install
Run the generator rails g ajax_nested_fields:install
Having nested attributes in your models, you can use the fields_for helper method for nesting models as you normally do.
<%= link_to_new_child(f, "categories") %> <div id="categories"> <%= f.fields_for :categories do |builder| %> <%= render 'category_fields', :f => builder %> <% end %> </div>
Using a partial keeps the nested fields organized, the partial category_fields could be something like this:
<div class="category"> <%= f.label :size, "Size" %> <%= f.text_field :size %> <%= link_to_remove_fields "Remove", f, 'category' %> </div>
The important part is that you are able to use the helper methods link_to_new_child and link_to_remove_fields to generate links that dynamically add or remove fields.
You can use the link_to_new_child by passing the variable of your form and the association: <%= link_to_new_child(f, "categories") %>
And the same goes for the link_to_remove_fields, where you have to pass three arguments: the name, the f variable and the name of the container
<%= link_to_remove_fields "remove", f, 'category' %>
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