Question

我已经完成了这个https://docs.djangoproject.com/en/1.1/ref/models/querysets/#values-fields 但我的要求是不同的。

我有一个定制经理的商店模型：

class VegManager(models.Manager):
    def get_query_set(self):
        return super(VegManager, self).get_query_set().filter(plus=True)

class FruitsManager(models.Manager):
    def get_query_set(self):
        return super(FruitsManager, self).get_query_set().filter(plus=True)


class SweetsManager(models.Manager):
    def get_query_set(self):
        return super(SweetsManager, self).get_query_set().filter(plus=True)


    class Store(models.Model):
        vegetable = models.BooleanField()
        veg1_price = models.DecimalField(max_digits=6, decimal_places=2, null=True, blank=True)
        veg2_price = models.DecimalField(max_digits=6, decimal_places=2, null=True, blank=True)
        veg3_price = models.DecimalField(max_digits=6, decimal_places=2, null=True, blank=True)
        fruits = models.BoolearnField()
        fruit1_price = models.DecimalField(max_digits=6, decimal_places=2, null=True, blank=True)
        fruit2_price = models.DecimalField(max_digits=6, decimal_places=2, null=True, blank=True)
        fruit3_price = models.DecimalField(max_digits=6, decimal_places=2, null=True, blank=True)
        sweets = models.BooleanField()
        sweet1_price = models.DecimalField(max_digits=6, decimal_places=2, null=True, blank=True)
        sweet2_price = models.DecimalField(max_digits=6, decimal_places=2, null=True, blank=True)
        sweet3_price = models.DecimalField(max_digits=6, decimal_places=2, null=True, blank=True)
        objects = models.Manager()
        v = VegManager()
        f = FruitsManager()
        s = SweetsManager()

    class Veg(Store):
        class Meta:
            proxy = True

    class  Froots(Store):
        class Meta:
            proxy = True

    class Sweet(Store):
        class Meta:
            proxy = True

如果我做sweets.v.all()并且它只给我蔬菜的价格吗？而不是获得糖果和水果的所有价格数据？

谢谢！

Answer 1

您不应该通过vegetable，fruits和sweets布尔字段而不是plus过滤您的经理，这是我甚至没有看到的字段你的模特？

class VegManager(models.Manager):
    def get_query_set(self):
        return super(VegManager, self).get_query_set().filter(vegetables=True)

class FruitsManager(models.Manager):
    def get_query_set(self):
        return super(FruitsManager, self).get_query_set().filter(fruits=True)

class SweetsManager(models.Manager):
    def get_query_set(self):
        return super(SweetsManager, self).get_query_set().filter(sweets=True)

Answer 2

https://docs.djangoproject.com/en/1.1/ref/models/querysets/#defer-fields

从django模型中选择列出的字段

2 个答案: