Methods
R
Included Modules
Instance Public methods
render_to_string(*)

Overwrite render_to_string because body can now be set to a rack body.

Source: show | on GitHub 

# File actionpack/lib/action_controller/metal/rendering.rb, line 22
def render_to_string(*)
  if self.response_body = super
    string = ""
    response_body.each { |r| string << r }
    string
  end
ensure
  self.response_body = nil
end