Makes some attributes optional in API response to get faster/lightweight responses.

These attributes are not required for common uses case (eg. updating an object). They can be requested in the reponse using the 'include' parameter. Example GET /issues/1.xml?include=journals. The list of attributes that can be included in responses will be documented in the wiki.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4486 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/helpers/application_helper.rb

@@ -866,6 +866,16 @@ module ApplicationHelper
   def favicon
     "<link rel='shortcut icon' href='#{image_path('/favicon.ico')}' />"
   end
+  
+  # Returns true if arg is expected in the API response
+  def include_in_api_response?(arg)
+    unless @included_in_api_response
+      param = params[:include]
+      @included_in_api_response = param.is_a?(Array) ? param.collect(&:to_s) : param.to_s.split(',')
+      @included_in_api_response.collect!(&:strip)
+    end
+    @included_in_api_response.include?(arg.to_s)
+  end
 
   private