Loop & output content_tags within content_tag in helper

Question

I\'m trying a helper method that will output a list of items, to be called like so:

foo_list( [\'item_one\', link_to( \'item_two\', \'#\' ) ... ] )
         


        

Answer 1

The big issue is that content_tag isn't doing anything smart when it receives arrays, you need to send it already processed content. I've found that a good way to do this is to fold/reduce your array to concat it all together.

For example, your first and third example can use the following instead of your items.map/collect line:

items.reduce(''.html_safe) { |x, item| x << content_tag(:li, item) }

For reference, here is the definition of concat that you're running into when you execute this code (from actionpack/lib/action_view/helpers/tag_helper.rb).

def concat(value)
  if dirty? || value.html_safe?
    super(value)
  else
    super(ERB::Util.h(value))
  end
end
alias << concat