Vendure: How to Properly Subscribe to activeOrder

[martavis]

Describe the bug
After attempting to use Apollo's Subscription method (WebSockets), I get the following error, Error during WebSocket handshake: Unexpected response code: 400.

So more of a general question: I do not see a subscription method in the Shop API Guide. Does Vendure allow the ws:// protocol?

Use case:
I have at cart icon in the header and upon using addToCart, I expect to be able to listen to changes in the cart to update the user in real-time without having to pass props.

Edit:
Just randomly tried to use activeOrder as a subscription and got this error: Schema is not configured for subscriptions. It makes sense but it further supports my question.

[michaelbromley]

Hi,
Vendure currently does not define any Subscriptions, only Queries and Mutations.

However, you shouldn't need subscriptions to solve the problem you mention. The cart contents only change in response to user actions, e.g addItemToOrder. So as long as you are making use of the Apollo cache, then the active order should get updated in the cache in all places after executing that mutation. At least, that's how it works in Apollo Client with Angular. I'm sure there is similar functionality when using React but I cannot advise on specifics.

[martavis]

Thanks for the response. For anyone tuning in, for React I ended up using the Context API, so creating a global state for the cart and pushing to it every time I use addItemToOrder.