Here's my input code:
= f.input :report_columns, :label => "Columns", :as => :check_boxes, :collection => ["One", "Two", "Three"]
If I check just "Three" and submit, the value I get for report columns is:
Thanks. I heart formtastic.
Thanks for the kind words.
I believe this is a duplicate of #697, for which there are two related pull requests #702 and #705, all of which are under debate, so I'm going to close this down, feel free to chime in on #697 or the pulls.