xxxxxxxxxx
protected fun getCollection(): MongoCollection<T> =
getDaoEntityClass().let { k ->
MongoDb.getDatabase().getCollection(
KMongoUtil.defaultCollectionName(k), k.java)
}
@Suppress("UNCHECKED_CAST")
private fun getDaoEntityClass(): KClass<T>
= ((this::class.java.genericSuperclass
as ParameterizedType).actualTypeArguments[0] as Class<T>).kotlin