#17 HABTM Checkboxes
It is often asked: how do I create a list of checkboxes for managing a HABTM association? Ask no more because this episode will show you how to do exactly that.
There is a newer version of this episode, see the revised episode.
products/_form.rhtml
<% for category in Category.find(:all) %> <div> <%= check_box_tag "product[category_ids][]", category.id, @product.categories.include?(category) %> <%= category.name %> </div> <% end %>
products_controller.rb
def update params[:product][:category_ids] ||= [] #... end
