lib/dynamoid/document.rb in dynamoid-1.3.0 vs lib/dynamoid/document.rb in dynamoid-1.3.1

@@ -11,10 +11,10 @@
       class_attribute :options, :read_only_attributes, :base_class
       self.options = {}
       self.read_only_attributes = []
       self.base_class = self
 
-      Dynamoid.included_models << self
+      Dynamoid.included_models << self unless Dynamoid.included_models.include? self
     end
 
     module ClassMethods
       # Set up table options, including naming it whatever you want, setting the id key, and manually overriding read and
       # write capacity.