diff --git a/lib/model_stubbing/model.rb b/lib/model_stubbing/model.rb
index b10b687..ab75c0f 100644
--- a/lib/model_stubbing/model.rb
+++ b/lib/model_stubbing/model.rb
@@ -30,7 +30,7 @@ def initialize(definition, klass, options = {}, &block)
       unless @model_class.respond_to?(:mock_id)
         class << @model_class
           define_method :mock_id do
-            @mock_id ||= 999
+            @mock_id ||= 9999
             @mock_id  += 1
           end
         end
diff --git a/lib/model_stubbing/stub.rb b/lib/model_stubbing/stub.rb
index 24f66c8..c2bac0d 100644
--- a/lib/model_stubbing/stub.rb
+++ b/lib/model_stubbing/stub.rb
@@ -51,6 +51,7 @@ def inspect
     
     def insert(attributes = {})
       object = record(attributes)
+      object.id = nil
       object.new_record = true
       object.save!
     end
@@ -119,6 +120,9 @@ def instantiate(this_record_key, attributes)
           # set association
           meta.send :attr_accessor, key unless record.respond_to?("#{key}=")
           record.send("#{key}=", value.is_a?(Stub) ? value.record : value)
+        elsif value.is_a? Array
+          value.collect! { |v| v.is_a?(Stub) ? v.record : v }
+          record.send("#{key}=", value.compact)          
         else
           record.send("#{key}=", value)
         end