nests.diff

-  def self.create_with_dependencies(attrs = nil, &block)
-    if(attrs[:pick_up_place] and !attrs[:pick_up_place].is_a?(Place))
-      attrs[:pick_up_place] = Place.create(attrs[:pick_up_place])
-    end
-    if(attrs[:drop_off_place] and !attrs[:drop_off_place].is_a?(Place))
-      attrs[:drop_off_place] = Place.create(attrs[:drop_off_place])
-    end
-    create_without_dependencies(attrs, &block)
-  end
-  class_eval do
-    class << self
-      alias_method_chain :create, :dependencies
-    end
-  end
+  accepts_nested_attributes_for :pick_up_place, :drop_off_place