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@@ -8,12 +8,13 @@ module ActiveRecord
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         attribute_method_suffix '_valid?'
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         validate :validate_predicates
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-
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-        class_inheritable_reader :semantic_attributes
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-        write_inheritable_attribute :semantic_attributes, SemanticAttributes.new
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       end
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     end
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+    def semantic_attributes
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+      self.class.semantic_attributes
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+    end
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+
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     # the validation hook that checks all predicates
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     def validate_predicates
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       semantic_attributes.each do |attribute|
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@@ -67,6 +68,10 @@ module ActiveRecord
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     end
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     module ClassMethods
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+      def semantic_attributes
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+        read_inheritable_attribute(:semantic_attributes) || write_inheritable_attribute(:semantic_attributes, SemanticAttributes.new)
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+      end
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+
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       # Provides sugary syntax for adding and querying predicates
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       #
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       # The syntax supports the following forms: