proposed dm changes for update! bug.rb

From 37e5373cf03468b4c9c6579ea82a0fcda4c4a3ca Mon Sep 17 00:00:00 2001
From: Vishnu Iyengar <pathsny@gmail.com>
Date: Sun, 21 Mar 2010 10:24:51 +0530
Subject: [PATCH] updating collection#update! and resource _update to validate attributes similarly

---
 lib/dm-core/collection.rb |    6 +++---
 lib/dm-core/resource.rb   |   34 ++++++++++++++++++++++------------
 2 files changed, 25 insertions(+), 15 deletions(-)

diff --git a/lib/dm-core/collection.rb b/lib/dm-core/collection.rb
index 3418119..050707a 100644
--- a/lib/dm-core/collection.rb
+++ b/lib/dm-core/collection.rb
@@ -836,12 +836,12 @@ module DataMapper
       assert_update_clean_only(:update!)
 
       model = self.model
-
-      dirty_attributes = model.new(attributes).dirty_attributes
+			model_instance = model.new(attributes)
+      dirty_attributes = model_instance.dirty_attributes
 
       if dirty_attributes.empty?
         true
-      elsif dirty_attributes.any? { |property, value| !property.valid?(value) }
+      elsif !model_instance.attributes_valid?
         false
       else
         unless _update(dirty_attributes)
diff --git a/lib/dm-core/resource.rb b/lib/dm-core/resource.rb
index c483fa5..2dc9bf3 100644
--- a/lib/dm-core/resource.rb
+++ b/lib/dm-core/resource.rb
@@ -645,6 +645,19 @@ module DataMapper
       Query.new(repository, model, :fields => fields, :conditions => conditions)
     end
 
+    #Validates the attribute list
+    #
+    # this is to allow various update methods to validate whether the proposed list
+    # of attributes is valid
+    #
+    # @return [Boolean]
+    #  true if the list is valid
+    #
+    # @api semipublic
+    def attributes_valid?
+	  	self.original_attributes.all? {|property, _value| property.valid?(property.get!(self))}
+	  end
+
     protected
 
     # Method for hooking callbacks on resource creation
@@ -924,24 +937,21 @@ module DataMapper
     # @api private
     def _update
       original_attributes = self.original_attributes
-
-      if original_attributes.any? { |property, _value| !property.valid?(property.get!(self)) }
-        false
-      else
+			
+			return false unless self.attributes_valid?
         # remove from the identity map
-        remove_from_identity_map
+      remove_from_identity_map
 
-        repository.update(dirty_attributes, collection_for_self)
+      repository.update(dirty_attributes, collection_for_self)
 
-        original_attributes.clear
+      original_attributes.clear
 
-        # remove the cached key in case it is updated
-        remove_instance_variable(:@_key)
+      # remove the cached key in case it is updated
+      remove_instance_variable(:@_key)
 
-        add_to_identity_map
+      add_to_identity_map
 
-        true
-      end
+      true
     end
 
     # @api private
-- 
1.6.5.2