update_attributes should save model

lib/data_mapper/resource.rb

@@ -231,12 +231,22 @@ def attributes=(values_hash)
       end
     end
 
+    # Updates attributes and saves model
+    #
+    # ==== Parameters
+    # <Hash>:: Attributes to be updates
+    # <Symbol, String, Array>:: Keys of Hash to update (others won't be updated)
+    #
+    # ==== Returns
+    # <TrueClass, FalseClass>:: returns if model got saved or not
+    #-
+    # @public
     def update_attributes(hash, *update_only)
       raise 'Update takes a hash as first parameter' unless hash.is_a?(Hash)
       loop_thru = update_only.empty? ? hash.keys : update_only
       loop_thru.each {|attr|  send("#{attr}=", hash[attr])}
+      save
     end
-
 
     ##
     # Produce a new Transaction for the class of this Resource

spec/unit/resource_spec.rb

@@ -108,7 +108,7 @@ def self.default_storage_name
     jupiter.send(:private_attributes=, attributes.merge({ :core => 'Magma' }))
     jupiter.attributes.should == attributes.merge({ :core => 'Magma' })
 
-    jupiter.update_attributes({ :core => "Toast", :type => "Bob" }, :core)
+    jupiter.update_attributes({ :core => "Toast", :type => "Bob" }, :core).should be_true
     jupiter.core.should == "Toast"
     jupiter.type.should_not == "Bob"
   end