Return body parts directly to Rack rather than building a response string ourselves. Allows Rack middleware to orchestrate response building.

actionpack/lib/action_controller/base.rb

@@ -984,6 +984,7 @@ module ActionController #:nodoc:
       # of sending it as the response body to the browser.
       def render_to_string(options = nil, &block) #:doc:
         render(options, &block)
+        response.body
       ensure
         response.content_type = nil
         erase_render_results
@@ -1020,7 +1021,7 @@ module ActionController #:nodoc:
 
       # Clears the rendered results, allowing for another render to be performed.
       def erase_render_results #:nodoc:
-        response.body = nil
+        response.body = []
         @performed_render = false
       end
 
@@ -1247,13 +1248,12 @@ module ActionController #:nodoc:
         response.status = interpret_status(status || DEFAULT_RENDER_STATUS_CODE)
 
         if append_response
-          response.body ||= ''
-          response.body << text.to_s
+          response.body_parts << text.to_s
         else
           response.body = case text
-            when Proc then text
-            when nil  then " " # Safari doesn't pass the headers of the return if the response is zero length
-            else           text.to_s
+            when Proc then  text
+            when nil  then  [" "] # Safari doesn't pass the headers of the return if the response is zero length
+            else            [text.to_s]
           end
         end
       end

actionpack/lib/action_controller/integration.rb

@@ -332,11 +332,13 @@ module ActionController
             @cookies[name] = value
           end
 
-          @body = ""
           if body.is_a?(String)
-            @body << body
+            @body_parts = [body]
+            @body = body
           else
-            body.each { |part| @body << part }
+            @body_parts = []
+            body.each { |part| @body_parts << part.to_s }
+            @body = @body_parts.join
           end
 
           if @controller = ActionController::Base.last_instantiation
@@ -349,7 +351,7 @@ module ActionController
             @response = Response.new
             @response.status = status.to_s
             @response.headers.replace(@headers)
-            @response.body = @body
+            @response.body = @body_parts
           end
 
           # Decorate the response with the standard behavior of the

actionpack/lib/action_controller/response.rb

@@ -40,16 +40,30 @@ module ActionController # :nodoc:
     delegate :default_charset, :to => 'ActionController::Base'
 
     def initialize
-      @status = 200
+      super
       @header = Rack::Utils::HeaderHash.new(DEFAULT_HEADERS)
-
-      @writer = lambda { |x| @body << x }
-      @block = nil
-
-      @body = "",
       @session, @assigns = [], []
     end
 
+    def body
+      str = ''
+      each { |part| str << part.to_s }
+      str
+    end
+
+    def body=(body)
+      @body =
+        if body.is_a?(String)
+          [body]
+        else
+          body
+        end
+    end
+
+    def body_parts
+      @body
+    end
+
     def location; headers['Location'] end
     def location=(url) headers['Location'] = url end
 
@@ -152,7 +166,7 @@ module ActionController # :nodoc:
         @writer = lambda { |x| callback.call(x) }
         @body.call(self, self)
       elsif @body.is_a?(String)
-        @body.each_line(&callback)
+        callback.call(@body)
       else
         @body.each(&callback)
       end
@@ -162,7 +176,8 @@ module ActionController # :nodoc:
     end
 
     def write(str)
-      @writer.call str.to_s
+      str = str.to_s
+      @writer.call str
       str
     end
 
@@ -186,7 +201,7 @@ module ActionController # :nodoc:
 
           if request && request.etag_matches?(etag)
             self.status = '304 Not Modified'
-            self.body = ''
+            self.body = []
           end
 
           set_conditional_cache_control!
@@ -195,7 +210,7 @@ module ActionController # :nodoc:
 
       def nonempty_ok_response?
         ok = !status || status.to_s[0..2] == '200'
-        ok && body.is_a?(String) && !body.empty?
+        ok && !body_parts.respond_to?(:call) && body_parts.any?
       end
 
       def set_conditional_cache_control!
@@ -216,8 +231,8 @@ module ActionController # :nodoc:
           headers.delete('Content-Length')
         elsif length = headers['Content-Length']
           headers['Content-Length'] = length.to_s
-        elsif !body.respond_to?(:call) && (!status || status.to_s[0..2] != '304')
-          headers["Content-Length"] = (body.respond_to?(:bytesize) ? body.bytesize : body.size).to_s
+        elsif !body_parts.respond_to?(:call) && (!status || status.to_s[0..2] != '304')
+          headers["Content-Length"] = Rack::Utils.bytesize(body).to_s
         end
       end
 

actionpack/lib/action_controller/test_process.rb

@@ -258,11 +258,11 @@ module ActionController #:nodoc:
 
     # Returns binary content (downloadable file), converted to a String
     def binary_content
-      raise "Response body is not a Proc: #{body.inspect}" unless body.kind_of?(Proc)
+      raise "Response body is not a Proc: #{body_parts.inspect}" unless body_parts.kind_of?(Proc)
       require 'stringio'
 
       sio = StringIO.new
-      body.call(self, sio)
+      body_parts.call(self, sio)
 
       sio.rewind
       sio.read

actionpack/test/controller/rack_test.rb

@@ -258,7 +258,7 @@ class RackResponseTest < BaseRackTest
     }, headers)
 
     parts = []
-    body.each { |part| parts << part }
+    body.each { |part| parts << part.to_s }
     assert_equal ["0", "1", "2", "3", "4"], parts
   end
 end

actionpack/test/controller/send_file_test.rb

@@ -44,12 +44,12 @@ class SendFileTest < ActionController::TestCase
     response = nil
     assert_nothing_raised { response = process('file') }
     assert_not_nil response
-    assert_kind_of Proc, response.body
+    assert_kind_of Proc, response.body_parts
 
     require 'stringio'
     output = StringIO.new
     output.binmode
-    assert_nothing_raised { response.body.call(response, output) }
+    assert_nothing_raised { response.body_parts.call(response, output) }
     assert_equal file_data, output.string
   end