some optimisations

Gemfile.lock

@@ -12,9 +12,9 @@ GEM
   remote: http://rubygems.org/
   specs:
     abstract (1.0.0)
-    actionpack (3.0.4)
-      activemodel (= 3.0.4)
-      activesupport (= 3.0.4)
+    actionpack (3.0.5)
+      activemodel (= 3.0.5)
+      activesupport (= 3.0.5)
       builder (~> 2.1.2)
       erubis (~> 2.6.6)
       i18n (~> 0.4)
@@ -22,11 +22,11 @@ GEM
       rack-mount (~> 0.6.13)
       rack-test (~> 0.5.7)
       tzinfo (~> 0.3.23)
-    activemodel (3.0.4)
-      activesupport (= 3.0.4)
+    activemodel (3.0.5)
+      activesupport (= 3.0.5)
       builder (~> 2.1.2)
       i18n (~> 0.4)
-    activesupport (3.0.4)
+    activesupport (3.0.5)
     builder (2.1.2)
     couchrest (1.0.1)
       json (>= 1.4.6)
@@ -43,9 +43,9 @@ GEM
       rack (>= 1.0.0)
     rack-test (0.5.7)
       rack (>= 1.0)
-    railties (3.0.4)
-      actionpack (= 3.0.4)
-      activesupport (= 3.0.4)
+    railties (3.0.5)
+      actionpack (= 3.0.5)
+      activesupport (= 3.0.5)
       rake (>= 0.8.7)
       thor (~> 0.14.4)
     rake (0.8.7)

b/couchrest.rb

@@ -12,6 +12,8 @@ class BenchmarkCasted < Hash
 end
 
 class BenchmarkModel < CouchRest::Model::Base
+  use_database CouchRest.database!(ENV['BENCHMARK_DB'] || "http://localhost:5984/test")
+
   property :string, String
   property :number, Integer
   property :casted, BenchmarkCasted
@@ -60,5 +62,13 @@ begin
       n.times { b.casted_list }
     end
 
+    # db writing
+    if ENV['BENCHMARK_DB']
+      x.report("write record") do
+        # need to make change before it will save
+        n.times { b.string = "test#{n}"; b.save }  
+      end
+    end
+
   end
 end

lib/couchrest/model/dirty.rb

@@ -18,9 +18,7 @@ module CouchRest
       def couchrest_attribute_will_change!(attr)
         return if attr.nil?
         self.send("#{attr}_will_change!")
-        if pkey = casted_by_attribute
-          @casted_by.couchrest_attribute_will_change!(pkey)
-        end
+        couchrest_parent_will_change!
       end
       
       def couchrest_parent_will_change!
@@ -31,9 +29,9 @@ module CouchRest
       
       # return the attribute name this object is referenced by in the parent
       def casted_by_attribute
-        return nil unless @casted_by
+        return @casted_by_attribute if @casted_by_attribute_set
         attr = @casted_by.attributes
-        attr.keys.detect { |k| attr[k] == self }
+        @casted_by_attribute = attr.keys.detect { |k| attr[k] == self }
       end
 
     end

lib/couchrest/model/properties.rb

@@ -53,16 +53,22 @@ module CouchRest
       end
 
       def []=(key,value)
-        old_id = get_unique_id if self.respond_to?(:get_unique_id)
+        has_changes = self.changed?
+        if !has_changes && self.respond_to?(:get_unique_id)
+          check_id_change = true
+          old_id = get_unique_id
+        end
 
-        super(key, value)
+        ret = super(key, value)
 
-        if self.respond_to?(:get_unique_id)
+        if check_id_change
           # if we have set an attribute that results in the _id changing (unique_id),
           # force changed? to return true so that the record can be saved
           new_id = get_unique_id
           changed_attributes["_id"] = new_id if old_id != new_id
         end
+
+        ret
       end
 
       # Takes a hash as argument, and applies the values by using writer methods
@@ -181,8 +187,8 @@ module CouchRest
             property(:created_at, Time, :read_only => true, :protected => true, :auto_validation => false)
 
             set_callback :save, :before do |object|
-              write_attribute_dirty('updated_at', Time.now)
-              write_attribute_dirty('created_at', Time.now) if object.new?
+              write_attribute('updated_at', Time.now)
+              write_attribute('created_at', Time.now) if object.new?
             end
           EOS
         end