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I want to use find_or_create_by, but this statement does NOT work. It does not "find" or "create" with the other attributes. productproperty = ProductProperty.find_or_create_by_product_id(:product_id => product.id, :property_id => property.id, :value => d[descname]) There seems to be very little, or no, information on the use of dynamic finders in Rails 3. "and"-ing these together gives me a an unknown method error. UPDATE: Originally I couldn't get the following to work. Please assume I'm not an idiot and "product" is an instance of Product AR model. product.product_properties.find_or_create_by_property_id_and_value(:property_id => 1, :value => "X") The error methods was: no such keys: property_id, value I couldn't figure that out. Only this morning did I find the reference to passing the values like this instead: product.product_properties.find_or_create_by_property_id_and_value(1, "X") And voilá, it works fine. I would have expected a hash to work in the same situation but I guess not. So I guess you get a down vote if you miss something on the internet?

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