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HABTM Checkboxes (revised)

#17 HABTM Checkboxes (revised)

Dec 22, 2011 | 6 minutes | Active Record, Views, Forms
A many-to-many association can be edited through check boxes in a form. Here I show how to do this with a has_many through association complete with clickable labels.
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rails console 
p = Product.first
p.category_ids
p.category_ids = [1, 2]
p.categories
products/_form.html.erb 
<%= hidden_field_tag "product[category_ids][]", nil %>
<% Category.all.each do |category| %>
  <%= check_box_tag "product[category_ids][]", category.id, @product.category_ids.include?(category.id), id: dom_id(category) %>
  <%= label_tag dom_id(category), category.name %><br>
<% end %>