Retrieving a list of GORM persistent properties for a domain

What's the best/easiest way to get a list of the persistent properties associated with a given GORM domain object? I can get the list of all properties, but this list contains non-persistent fields such as class and constraints.

Currently I'm using this and filtering out the list of nonPersistent properties using a list I created:

    def nonPersistent = ["log", "class", "constraints", "properties", "errors", "mapping", "metaClass"]
    def newMap = [:]
    domainObject.getProperties().each { property ->
        if (!nonPersistent.contains(property.key)) {
            newMap.put property.key, property.value
        }
    }

There seems like there must be a better way of getting just the persistent properties.