Use HASH KEY instead of id for ids in indexes.

lib/dynamoid/indexes/index.rb

@@ -83,19 +83,19 @@ def save(obj)
         return true if values[:hash_value].blank? || (!values[:range_value].nil? && values[:range_value].blank?)
         existing = Dynamoid::Adapter.read(self.table_name, values[:hash_value], { :range_key => values[:range_value] })
         ids = ((existing and existing[:ids]) or Set.new)
-        Dynamoid::Adapter.write(self.table_name, {:id => values[:hash_value], :ids => ids.merge([obj.id]), :range => values[:range_value]})
+        Dynamoid::Adapter.write(self.table_name, {:id => values[:hash_value], :ids => ids.merge([obj.hash_key]), :range => values[:range_value]})
       end
 
-      # Delete an object from this index, preserving existing ids if there are any, and failing gracefully if for some reason the 
+      # Delete an object from this index, preserving existing ids if there are any, and failing gracefully if for some reason the
       # index doesn't already have this object in it.
       #
-      # @since 0.2.0      
+      # @since 0.2.0
       def delete(obj, changed_attributes = false)
         values = values(obj, changed_attributes)
         return true if values[:hash_value].blank? || (!values[:range_value].nil? && values[:range_value].blank?)
         existing = Dynamoid::Adapter.read(self.table_name, values[:hash_value], { :range_key => values[:range_value]})
-        return true unless existing && existing[:ids] && existing[:ids].include?(obj.id)
-        Dynamoid::Adapter.write(self.table_name, {:id => values[:hash_value], :ids => (existing[:ids] - Set[obj.id]), :range => values[:range_value]})
+        return true unless existing && existing[:ids] && existing[:ids].include?(obj.hash_key)
+        Dynamoid::Adapter.write(self.table_name, {:id => values[:hash_value], :ids => (existing[:ids] - Set[obj.hash_key]), :range => values[:range_value]})
       end
 
     end

spec/app/models/message.rb

@@ -6,4 +6,7 @@ class Message
   range :time, :datetime
 
   field :text
+  field :subject
+
+  index :subject, :range_key => :time
 end

spec/dynamoid/indexes/index_spec.rb

@@ -69,24 +69,42 @@
     Dynamoid::Adapter.read("dynamoid_tests_index_user_names", 'Josh')[:ids].should == Set['test123']
   end
 
-  it 'saves an object to the index it is associated with with a range' do
+  it 'saves an object to the index it is associated with a range' do
     @index = Dynamoid::Indexes::Index.new(User, :name, :range_key => :last_logged_in_at)
     @user = User.create(:name => 'Josh', :last_logged_in_at => @time)
-    
+
     @index.save(@user)
-    
+
     Dynamoid::Adapter.read("dynamoid_tests_index_user_last_logged_in_ats_and_names", 'Josh', :range_key => @time.to_f)[:ids].should == Set[@user.id]
   end
-
+
+  it 'saves an object with another HASH than id to the index' do
+    @index = Dynamoid::Indexes::Index.new(Message, :subject, :range_key => :time)
+    @message = Message.create(:subject => 'Hello!', :time => @time.to_f, :message_id => 100)
+
+    @index.save(@message)
+    Dynamoid::Adapter.read("dynamoid_tests_index_message_subjects_and_times", 'Hello!', :range_key => @time.to_f)[:ids].should == Set[@message.message_id]
+  end
+
   it 'deletes an object from the index it is associated with' do
     @index = Dynamoid::Indexes::Index.new(User, :name)
     @user = User.create(:name => 'Josh', :password => 'test123', :last_logged_in_at => @time, :id => 'test123')
-    
+
     @index.save(@user)
     @index.delete(@user)
-    
+
     Dynamoid::Adapter.read("dynamoid_tests_index_user_names", 'Josh')[:ids].should be_nil
   end
+
+  it 'deletes an object with another HASH than id from the index it is associated with' do
+    @index = Dynamoid::Indexes::Index.new(Message, :subject, :range_key => :time)
+    @message = Message.create(:subject => 'Hello!', :time => @time.to_f, :message_id => 100)
+
+    @index.save(@message)
+    @index.delete(@message)
+
+    Dynamoid::Adapter.read("dynamoid_tests_index_message_subjects_and_times", 'Hello!', :range_key => @time.to_f)[:ids].should be_nil
+  end
 
   it 'updates an object by removing it from its previous index and adding it to its new one' do
     @index = Dynamoid::Indexes::Index.new(User, :name)