Rails' collection_select helper method and the “Create item” option at the end

Answer 1

I can't comment otherwise I'd add this to the answer above.

To get the option->value "new","or create a new one".. instead of

f.select(:category_id, @categories.collect {|p| [ p.name, p.id ] } + ['Or create a new one','new'], {:include_blank => 'Please select a category'})

do

f.select(:category_id, @categories.collect {|p| [ p.name, p.id ] } + [['Or create a new one','new']], {:include_blank => 'Please select a category'})

note the extra [] around the options. This makes the array work as an option,value pair