diff --git a/lib/populator/factory.rb b/lib/populator/factory.rb
index 6432769..30fd012 100644
--- a/lib/populator/factory.rb
+++ b/lib/populator/factory.rb
@@ -48,9 +48,10 @@ def populate(amount, options = {}, &block)
     # :per_query limit option is reached.
     def build_records(amount, per_query, &block)
       amount.times do
-        record = Record.new(@model_class, last_id_in_database + @records.size + 1)
+        index = last_id_in_database + @records.size + 1
+        record = Record.new(@model_class, index)
         @records << record
-        block.call(record) if block
+        block.call(record, index) if block
         save_records if @records.size >= per_query
       end
     end
diff --git a/spec/populator/factory_spec.rb b/spec/populator/factory_spec.rb
index 44aad3a..a2a2ba4 100644
--- a/spec/populator/factory_spec.rb
+++ b/spec/populator/factory_spec.rb
@@ -43,6 +43,18 @@
       @factory.populate(5, :per_query => 2)
       $queries_executed.grep(/^insert/i).should have(3).records
     end
+
+    it 'should pass index to populator block to help eliminate duplicates' do
+      Product.delete_all
+      indexes = []
+      num_to_populate = 5
+      @factory.populate(num_to_populate) do |product, index|
+        product.name = "unique name #{index}"
+      end
+      product_names = Product.all.map(&:name)
+      expected_product_names = (1..num_to_populate).to_a.map { |index| "unique name #{index}" }
+      product_names.should == expected_product_names
+    end
   end
 
   it "should only use two queries when nesting factories (one for each class)" do