Question

我在问我是否正确设置了create方法。或者是否需要为其他两个型号添加？怎么会改变？

class PointModel(models.Model):
    x       = models.IntegerField()
    y       = models.IntegerField()
    index           = models.IntegerField()

class DatetimeRangeModel(models.Model):
    start_datetime  = models.CharField(max_length=14)
    end_datetime    = models.CharField(max_length=14)

class PlanModel(models.Model):
    data_number             = models.IntegerField()
    data_datetime_range     = models.ForeignKey(DatetimeRangeModel, blank=True, null=True, on_delete=models.SET_NULL)
    data_polygon            = models.ForeignKey(PointModel, blank=True, null=True, on_delete=models.SET_NULL)

    @classmethod
    def create(cls, data_number, data_datetime_range, data_polygon):
        plan = cls(data_number=data_number, data_datetime_range = data_datetime_range,
                    data_polygon=data_polygon)

        return plan

编辑：我更改了修复未定义的结构，并添加了一些逻辑，阻止PlanModel被删除，其中“blank = True，null = True，on_delete = models.SET_NULL”

这看起来不错吗？

Answer 1

查看creating objects

的文档

@classmethod
def create(cls, title):
    book = cls(title=title)
    # do something with the book
    return book

没有太多理由添加这些内容，除非您在# do something with the book行添加内容

编辑：您通常不会致电create：

plan = PlanModel(data_number=1, ....)
plan.save()

或有时：

plan = PlanModel()
plan.data_number=1
...
plan.save()

我是否正确设置了它？

1 个答案: