Question

我有一个问题看下面：

我有这个型号：

class Shoes(models.Model):
    shop            = models.ForeignKey(Store, related_name="%(class)s")
    name            = models.ForeignKey(ShoesItem)
    size            = models.ManyToManyField(ShoesSize, help_text=_("Get useful sizes")) 
    price           = models.IntegerField()

在我的情况下，我有模特ShoesSize用于存储所有ShoesSize和ShoesItem用于存储此商品

如何从ShoesItem实例中获取所有尺码和所有商店？有（例如，不完整）：

class Store(models.Model):
    name            = models.CharField(max_length=255) 


class Item(models.Model):
    name            = models.CharField(max_length=255)
    brand           = models.ForeignKey(Brand, related_name="%(app_label)s_%(class)s")  
    sysname         = models.SlugField(max_length=255) 

    has_shop        = models.BooleanField(editable=False, default=False)
    description     = models.TextField(blank=True, verbose_name="Описание")
    color           = models.ManyToManyField(Color, blank=True, related_name='%(app_label)s_%(class)s')

我获得了Item模型的实例列表。在那之后，我想获得所有类型的物品的所有尺寸和商店

Answer 1

使用型号名称使用反向查询。

获取鞋子项目：

shoes_item = ShoesItem.objects.all()[0]

通过Shoes对象获取ShoesItem的ShoesSize对象：

sizes = ShoesSize.objects.filter(shoes__name=shoes_item)

通过Shoes对象获取ShoesItem的Store对象：

shops = Store.objects.filter(shoes__name=shoes_item)

了解详情 - Lookups that span relationships

对于ShoesItem的查询集：

shoes_items = ShoesItem.objects.filter(has_shop=True)
sizes = ShoesSize.objects.filter(shoes__name__in=shoes_items)
shops = Store.objects.filter(shoes__name__in=shoes_items)

从相关模型中获取所有实例

1 个答案: