Question

我的Django应用程序中有以下模型：订单与购物车相关， cartItem 与购物车和产品。现在我的tastypie api当我获得订单时，我也希望获得与订单购物车相关的所有产品。

class Order(models.Model):
     objects = OrderManager()    
     order_number = models.CharField(max_length=20, editable=False,unique=True,   
                                default=get_unique_order_number)
     user = models.ForeignKey(User, blank=True, null=True)
     cart = models.ForeignKey(Cart, blank=True, null=True)  
     ...


class Cart(models.Model):
     user = models.ForeignKey(User)
     is_check_out = models.BooleanField(default=False)
     ...

class CartItem(models.Model):
     objects = CartItemManager()
     cart = models.ForeignKey(Cart)
     product = models.ForeignKey(Product)
     ...

class CartRelatedResource(ModelResource):
    class Meta:
    queryset = Cart.objects.all()
    allowed_methods = ['get'] 
    excludes = ['is_check_out', 'session', 'creation_date', 'modification_date']
    include_resource_uri = False       
    authentication = SessionAuthentication()

class OrderResource(ModelResource):
    cart = fields.ForeignKey(CartRelatedResource, 'cart',full=True)

    class Meta:
       queryset = Order.objects.all()
       resource_name = 'order'
       fields = ['cart_id','delivery_time','shipping_address_id','billing_address_id',
       'tip','phone','delivery_instructions']
       include_resource_uri = False
       allowed_methods = ['post','get']
       authentication = SessionAuthentication()
       authorization = OrderAuthorization()

我不认为在这种情况下使用ToManyField会起作用。会吗？实现我想要的最好方法是什么？

Answer 1

我想我已经解决了。如您所知，products字段是最重要的部分：

class ProductRelatedResource(ModelResource):
    class Meta:
        queryset = Product.objects.all()
        fields = ['id', 'name']
        include_resource_uri = False


class OrderResource(ModelResource):
    products = fields.ToManyField(ProductRelatedResource,
        attribute=lambda bundle: Product.objects.filter(cartitem__cart=bundle.obj.cart), full=True)

    class Meta:
        queryset = Order.objects.all()
        resource_name = 'order'
        include_resource_uri = False

Django-TastyPie反向间接外键

1 个答案: