The model cannot be validated if it is preloaded and the attribute/co…

…lumn is not in the database (migration still not runned). Ususally 'test' and 'production' environments.

lib/bitmask_attribute.rb

@@ -25,6 +25,10 @@ def install_on(model)
     #######
 
     def validate_for(model)
+      # The model cannot be validated if it is preloaded and the attribute/column is not in the
+      # database (migration still not runned). Ususally 'test' and 'production' environments.
+      return if defined?(Rails) && Rails.configuration.cache_classes
+
       unless model.columns.detect { |col| col.name == attribute.to_s }
         raise ArgumentError, "`#{attribute}' is not an attribute of `#{model}'"
       end