Rails - Render a partial in a different format

gistfile1.rb

# Render a partial in a different format
#
# Parameter : String or Array
# Usage :
# <% with_format('html') do %>
#   <%= render(partial: 'partial') %>
# <% end %>
def with_format(formats)
  original_formats = self.formats
  self.formats = formats.kind_of?(Array) ? formats : [formats]
  result = yield
  self.formats = original_formats
  return result
end

# See http://stackoverflow.com/questions/339130/how-do-i-render-a-partial-of-a-different-format-in-rails