Python changin/更新条带订阅（django）的问题

目前，我在我的网站上有一个可用的订阅的代码。代码检查用户是否已经有计划，如果没有，则运行else语句（工作正常），如果有，则用新订阅替换用于更新其当前订阅的代码。（不工作）

当我尝试将用户订阅更新为新订阅时，出现以下运行时错误：

Request req_kK2v51jnhuuKsW: Cannot add multiple subscription items with the same plan: price_HHU1Y81pU1wrNp

我正在测试的帐户的计划与我尝试更新的计划不同。（此代码用于基本计划，该帐户已启用标准计划）

非常感谢您的帮助

编辑：这是模型数据，我尝试将所有“无”值更改为其他值，以查看是否会更改错误，但没有

SUB_PLANS = [
('None','None'),
('B','Basic Plan'),
('S', 'Standard Plan'),
('P', 'Premium Plan'),
]


GENRE_CHOICES = [
('1','None'),
('2','Adventure'),
('3','Action'),
('4','Puzzle'),
('5','Story Based'),

]

# Create your models here.
class Profile(models.Model):
    User = models.OneToOneField(User, null=True, on_delete=models.CASCADE)
    username = models.CharField(max_length=30)
    #where games are sent
    inbox = models.EmailField(max_length = 50)
    current_plan = models.CharField(max_length = 4, choices = SUB_PLANS, default='None')
    #genres they like
    genre_one = models.CharField(max_length = 20, choices = GENRE_CHOICES, default = 'None')
    genre_two = models.CharField(max_length = 20, choices = GENRE_CHOICES, default = 'None')
    genre_three = models.CharField(max_length = 20, choices = GENRE_CHOICES, default = 'None')

    subscription_id = models.CharField(max_length = 40, default="None")
    customer_id = models.CharField(max_length = 40, default = "None")

    '''on account creation plan == null, then once they buy one,
    plan is added as a dropdown that they can edit easy'''
    def __str__(self):
        return self.username

---

这里的诀窍是，如果要更新已经有单个项的现有订阅，则需要在更新时传递该SubscriptionItem的ID，以便API知道您没有尝试使用相同的计划添加第二个SubscriptionItem

根据该错误消息，该计划似乎已在该订阅上更新，但可能不是您期望的方式。如果订阅是从“标准”计划开始的，那么执行了上面的代码，它很可能在现有标准之外添加了“基本”计划。我打赌他们现在订阅了

basic

和

standard

。为了达到预期效果，您需要删除标准SubscriptionItem并添加基本SubscriptionItem，我将在下面展示其代码。或者，您可以直接交换计划

请注意，如果每个订阅有多个计划，则需要修改此示例以找到正确的SubscriptionItem ID。以下是一种方法：

current_subscription = stripe.Subscription.retrieve(user_info.subscription_id)

new_plan = stripe.Subscription.modify(
    user_info.subscription_id,
    cancel_at_period_end=True,
    proration_behavior='create_prorations',
    #the new subscription
    items=[{
        'id': current_subscription['items'].data[0].id, # note if you have more than one Plan per Subscription, you'll need to improve this. This assumes one plan per sub.
        'deleted': True,
    }, {
        'plan': 'price_HHU1Y81pU1wrNp'
    }]
)

---

感谢您的详细回复！我现在明白我错在哪里了：）

current_subscription = stripe.Subscription.retrieve(user_info.subscription_id)

new_plan = stripe.Subscription.modify(
    user_info.subscription_id,
    cancel_at_period_end=True,
    proration_behavior='create_prorations',
    #the new subscription
    items=[{
        'id': current_subscription['items'].data[0].id, # note if you have more than one Plan per Subscription, you'll need to improve this. This assumes one plan per sub.
        'deleted': True,
    }, {
        'plan': 'price_HHU1Y81pU1wrNp'
    }]
)