我在下面定义了一个货币模型:
class Currency(models.Model):
"""
Currency Model
Defines the attribute of Currency
"""
class Meta:
verbose_name = "Currency"
verbose_name_plural = "Currencies"
ordering = ['Currency_Name']
def __str__(self):
return self.Currency_Name
Currency_Date = models.DateTimeField(auto_now_add=True)
Currency_Date_Update = models.DateTimeField(auto_now=True)
Currency_Name = models.CharField(max_length=3, unique=True)
Is_Secondary_Ccy = models.CharField(max_length=1, choices=Y_N_BOOLEAN)
Primary_Currency = models.ForeignKey('self', on_delete=models.DO_NOTHING, null=True) # to refer to itself
Primary_Factor = models.IntegerField(default=1)
Currency_Name_Reuters = models.CharField(max_length=3)
模型通过“ Primary_Currency”列与其自身链接
在我的管理员中(下图),我可以看到链接,但是如果我打开下拉列表,则该标签不是用户友好的“货币对象(0)等...”
我可以使用“ Primary_Currency”的值“ Currency_Name”吗?
感谢您的帮助:)
答案 0 :(得分:2)
使用模型类的__str__()
方法,
DT[,
last_value2 :=
fifelse(condition == "Yes", value, NA_integer_) %>%
shift() %>%
nafill("locf"),
by = group
]