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
22:     def render_to_string(*)
23:       if self.response_body = super
24:         string = ""
25:         response_body.each { |r| string << r }
26:         string
27:       end
28:     ensure
29:       self.response_body = nil
30:     end