Comparing using attribute hash if ids are nil

history.md

@@ -9,6 +9,7 @@
   * Validation callbacks now support context (thanks kostia)
   * Document comparisons now performed using database and document ID (pointer by neocsr)
   * Automatic config generation now supported (thanks lucasrenan)
+  * Comparing documents resorts to Hash comparison if both IDs are nil. (pointer by kostia)
 
 ## 1.1.0.rc1 - 2011-06-08
 

lib/couchrest/model/base.rb

@@ -99,8 +99,13 @@ module CouchRest
       # a Hash comparison on the attributes.
       def == other
         return false unless other.is_a?(Base)
+        if id.nil? && other.id.nil?
+          # no ids? assume comparing nested and revert to hash comparison
+          to_hash == other.to_hash
+        else
           database == other.database && id == other.id
         end
+      end
       alias :eql? :==
 
     end

spec/unit/base_spec.rb

@@ -154,6 +154,7 @@ describe "Model Base" do
 
   describe "comparisons" do
     describe "#==" do
+      context "on saved document" do
         it "should be true on same document" do
           p = Project.create
           p.should eql(p)
@@ -168,6 +169,24 @@ describe "Model Base" do
           p2.stub!(:database).and_return('other')
           p.should_not eql(p2)
         end
+        it "should always be false if one document not saved" do
+          p = Project.create(:name => 'test')
+          o = Project.new(:name => 'test')
+          p.should_not eql(o)
+        end
+      end
+      context "with new documents" do
+        it "should be true when attributes match" do
+          p = Project.new(:name => 'test')
+          o = Project.new(:name => 'test')
+          p.should eql(o)
+        end
+        it "should not be true when attributes don't match" do
+          p = Project.new(:name => 'test')
+          o = Project.new(:name => 'testing')
+          p.should_not eql(o)
+        end
+      end
     end
   end