How to declare custom global ID

Code
```python
class ShipNode(DjangoObjectType):
class Meta:
model = Ship
filter_fields = ['id', 'size']
interfaces = (relay.Node, )

rowid = graphene.String()

@resolve_only_args
def resolve_rowid(self):
return self.id

class Query(object):
ship = relay.Node.Field(ShipNode)
all_ships = DjangoFilterConnectionField(ShipNode)
```

I have an `id` field in my database which gets override when querying GraphQL server by the custom global ID. Using `resolve_rowid`, I can get the `id` I want, but I am unable to use it in the filters.

```python
query {
ship(id: "124567") {
}
}
```

How can I filter based on my database's primary key instead of the global ID? How can I rename global ID from `id` to `_id`?