Retrieve a Customer's Subscription ID from Stripe

Question

In Rails, I'm attempting to implement a controller action which will allow a customer to change the plan they are subscribed to. Per the Stripe documentation, this can be done as follows:

customer = Stripe::Customer.retrieve("CUSTOMER_ID")
subscription = customer.subscriptions.retrieve("SUBSCRIPTION_ID")
subscription.plan = "premium_monthly"
subscription.save

I have each customer's ID saved in the user table in my Database, but I'm stuck on how to retrieve a customer's subscription ID given their customer ID. Each customer in this project will only have one subscription, how could I go about pulling this given their customer ID?

Answer 1

The relevant part of the Stripe API reference suggests that upon retrieving a customer you will have access to a subscriptions attribute containing a url at which you can access a list of subscriptions.

However, on creating a subscription, Stripe will return the subscription to you with the subscription id. I would suggest storing this in your database as an attribute on the customer model (if they will only have one subscription) or, and the method I use, is to have a Subscription model in my database which stores some of the frequently accessed data and avoids pinging the Stripe API too much.