我有银行预订系统:这是我的客户模型:
class Customer(models.Model):
customer_bank = models.ForeignKey('Bank', on_delete=models.SET_NULL,related_name='coustmer_bank' ,null=True)
customer_branch = models.ForeignKey('Branch', on_delete=models.SET_NULL,related_name='coustmer_branch',null=True)
booking_id = models.CharField(max_length=120, blank= True,default=increment_booking_number)
identity_type = models.ForeignKey('IdentityType',on_delete=models.SET_NULL,related_name='identity_type',null=True)
identity_or_passport_number = models.CharField(max_length=20)
bank_account_no = models.CharField(max_length=15)
Done = models.BooleanField(default=False)
booking_date_time = models.DateTimeField(auto_now_add=True, auto_now=False)
Entrance_date_time = models.DateTimeField(auto_now_add=False, auto_now=True)# Must be modified to work with Entrance Date and Time
def __str__(self):
return self.booking_id
我需要为booking_id字段生成一个随机值取决于bank_number和branch_number以及客户ID,那么我该怎么做呢?请帮忙
您可以覆盖模型的save方法
class Customer(models.Model):
customer_bank = models.ForeignKey('Bank', on_delete=models.SET_NULL,related_name='coustmer_bank' ,null=True)
customer_branch = models.ForeignKey('Branch', on_delete=models.SET_NULL,related_name='coustmer_branch',null=True)
booking_id = models.CharField(max_length=120, blank= True,default=increment_booking_number)
identity_type = models.ForeignKey('IdentityType',on_delete=models.SET_NULL,related_name='identity_type',null=True)
identity_or_passport_number = models.CharField(max_length=20)
bank_account_no = models.CharField(max_length=15)
Done = models.BooleanField(default=False)
booking_date_time = models.DateTimeField(auto_now_add=True, auto_now=False)
Entrance_date_time = models.DateTimeField(auto_now_add=False, auto_now=True)# Must be modified to work with Entrance Date and Time
def __str__(self):
return self.booking_id
def get_booking_id(self):
bank_number = self.bank_number
branch_number = self.branch_number
id = # logic for calculating boking ID from bank_number, branch_number and other fields accessible from self.<field_name>
return id
def save(self, *args, **kwargs):
self.booking_id = self.get_booking_id()
super(Customer, self).save(*args, **kwargs)