How to pre-check checkboxes in formtastic

Question

I have a form I\'m trying to set up ... Users can have many posts, and each post can have many people watching it.

The Watch model is set up polymorphically as \'watcha

Answer 1

For multiple check boxes, this way:

<%= f.input :tags, :as => :check_boxes, :collection => some_map.collect { |c| [c[:name], c[:id], {:checked=> tag_ids.include?(c[:id])}] } %>