模型.py
class Area(models.Model):
area_name = models.CharField(max_length=255, null=False, blank=False)
description = models.TextField(null=False, blank=False)
class AreaPoint(models.Model):
x_axis = models.FloatField(default=0.0)
y_axis = models.FloatField(default=0.0)
area = models.OneToOneField(Area,primary_key=True,on_delete=models.CASCADE)
我尝试了两种方法,但都失败了,请指导我。谢谢
# first method :
# Area.objects.filter(id=304).update(area_name="today is 1", description="today is 1", areapoint__x_axis=111,areapoint__y_axis=222)
# error : Area has no field named 'areapoint__y_axis'
# second method :
obj = Area.objects.get(id=304)
print obj.areapoint.x_axis # 277
print obj.areapoint.y_axis # 65
obj.areapoint.x_axis = 100
obj.areapoint.y_axis = 200
print obj.areapoint.x_axis # 100
print obj.areapoint.y_axis # 200
obj.save()
print obj.areapoint.x_axis # 100
print obj.areapoint.y_axis # 200
第二种方法很奇怪。
areapoint.x_axis
and areapoint.y_axis
更新后真的不一样了
但在我的数据库中。它仍然是一样的。
在这两种方法中,您都试图更新Area
对象而不是AreaPoint
object.
以下是使用这两种方法的方法:
第一种方法: using update
method:
# here is what you are doing:
Area.objects.filter(id=304).update(area_name="today is 1",
description="today is 1",
areapoint__x_axis=111,
areapoint__y_axis=222)
上面将返回一个对象Area
由于没有字段areapoint__x_axis
等等它会抛出错误。
你可以做的就是过滤AreaPoint
相反并更新它:
AreaPoint.objects.filter(area_id=304).update(x_axis=111, y_axis=222)
第二种方法:
obj = Area.objects.get(id=304)
obj.areapoint.x_axis = 100
obj.areapoint.y_axis = 200
# save obj.areapoint instead
obj.areapoint.save()
第三种方法:
areapoint = AreaPoint.objects.get(area_id=304)
areapoint.x_axis = 100
areapoint.y_axis = 200
areapoint.save()
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