Django通过元类选择模型字段

Question

Here I need to choose user's first name and second name from another table. Model is StockTransfer but I need from Users model

class Meta:
    model = StockTransfer
    fields = (
        'id', 'from_stock', 'to_stock',
        'comment', 'products',
        'status', 'user',
        'transfer_request',
        'created_date',
        'date_delivery',
        'modified_date',
        'accepted_time',
        'cancelled_time',
        'first__name',
        'second__name'

    )

model ( users.py )

class User(AbstractBaseUser, PermissionsMixin):
    first_name = models.CharField(max_length=255)
    second_name = models.CharField(max_length=255)

----- stocktransfer.py (model)

class StockTransfer(BaseModel, DeleteMixin):
PENDING = '0'
APPROVED = '1'
CANCELLED = '2'

STATUS_CHOICES = (
    (PENDING, 'pending'),
    (APPROVED, 'approved'),
    (CANCELLED, 'cancelled'),
)

from_stock = models.ForeignKey('main.Stock', related_name='from_transfers')
to_stock = models.ForeignKey('main.Stock', related_name='to_transfers')
comment = models.CharField(max_length=255, blank=True, null=True)
status = models.CharField(max_length=1, choices=STATUS_CHOICES, default=PENDING)
user = models.ForeignKey('main.User', null=True)

I think I can choose the first name and second name just simple way write first_name and second_name in metaclass fields. Is it right? Any ideas?

Answer 1

Assuming that stock_transfer is an instance of StockTransfer:

stock_transfer = StockTransfer.objects.all().get(id=1)
first_name = stock_transfer.user.first_name
second_name = stock_transfer.user.second_name