如何通过tastypie API将产品放入购物车？

Question

假设我们有这些模型，虽然原始项目可能不同，但这将是一个常见的任务：

class Cart(models.Model):
    owner = models.ForeignKey(User)
    products = models.ManyToManyField(Product, symmetrical=False)

class Product(models.Model):
    title = models.CharField(max_length="255")
    description = models.TextField()

现在我想通过API把一个产品放进购物车。

我开始是这样做的：

class CartResource(ModelResource):
    products = fields.ManyToManyField(ProductResource, 'products', full=True)

    def override_urls(self):
        return [
            url(r"^(?P<resource_name>%s)/product/(?P<prodcut_id>\w[\w/-]*)/$" % (self._meta.resource_name), self.wrap_view('dispatch_detail_product'), name="api_dispatch_detail_product"),
        ]

    def dispatch_detail_product(.....):
        # A get is not useful or is it?
        # A post could put a product into the cart
        # A put (preferred) could put a product in the cart
        # A delete could delete a product from the cart

    class Meta:
        queryset = Product.objects.all()
        authentication = MyBasicAuthentication()
        authorization = DjangoAuthorization()
        list_allowed_methods = ['get']
        detail_allowed_methods = ['get', 'put', 'delete']

    def obj_update(self, bundle, request=None, **kwargs):
        return super(PrivateSpaceResource, self).obj_create(bundle, request, owner=request.user)

    def apply_authorization_limits(self, request, object_list):
        if len(object_list.filter(owner=request.user)) == 0:
            Cart.objects.create(owner=request.user)
        return object_list.filter(owner=request.user)

但我不太确定接下来该怎么做。跟django比起来，tastypie对开发者来说真是太不友好了。

Answer 1

我觉得你应该创建一个关系资源。请看下面的代码：

class LikeResource(ModelResource):
    profile = fields.ToOneField(ProfileResource, 'profile',full=True)
    post = fields.ToOneField(PostResource,'post')

    class Meta:
        queryset = Like.objects.all() 
        authentication = ApiKeyAuthentication()
        authorization = DjangoAuthorization()
        resource_name = 'like'
        filtering = {
            'post': 'exact',
            'profile':'exact',
        }

然后你可以向这个资源发送一个POST请求，以便将一个新产品添加到购物车中。