Allow passing of block to Document#initialize

lib/mongoid/document.rb

@@ -181,7 +181,8 @@ def initialize(attrs = {})
       @attributes = {}.with_indifferent_access
       process(defaults.merge(attrs))
       @new_record = true if id.nil?
-      generate_key
+      document = yield self if block_given?
+      generate_key; document
     end
 
     # Returns the class name plus its attributes.

spec/unit/mongoid/document_spec.rb

@@ -338,6 +338,19 @@
 
   describe "#new" do
 
+    context "when passed a block" do
+
+      it "yields self to the block" do
+        person = Person.new do |p|
+          p.title = "Sir"
+          p.age = 60
+        end
+        person.title.should == "Sir"
+        person.age.should == 60
+      end
+
+    end
+
     context "with no attributes" do
 
       it "sets default attributes" do