j3k0 commented on issue #4462:
URL: https://github.com/apache/couchdb/issues/4462#issuecomment-1463936020
Sure, a simplified pseudo example (our actual views are hundreds of lines)
Context: an "events" database that contains the interactions (REST and
Webhook calls) with various payment providers.
We want to emit the history of states for all transactions.
## Before updating the design document
```js
function (event) {
switch (event.type) {
case "appstore.webhook":
event.appleTransactions.forEach(function(appleTransaction) {
emit([appleTransaction.id, event.date],
appleTransaction.transactionState);
}); break;
case "appstore.verifyReceipt":
// handle specific data stored in "apple.verifyReceipt" events.
}
}
```
## After updating the design document
Now we want to add support for Google Play to our system.
```js
function (event) {
switch (event.type) {
// UNCHANGED
case "appstore.webhook":
event.appleTransactions.forEach(function(appleTransaction) {
emit([appleTransaction.id, event.date],
appleTransaction.transactionState);
}); break;
case "appstore.verifyReceipt":
// handle specific data stored in "apple.verifyReceipt" events.
// +++ ADDITION HERE +++ we add support for google-play-style
server-to-server notifications.
case "googleplay.notification":
emit([event.googlePurchase.purchaseToken, event.date],
event.googleNotification.type);
break;
// and more event types...
}
}
```
We could in principle redeploy this view to production without recomputing
the index, because there's no event with `type: "googleplay.notification"` in
the database yet. Note: our DB is 5TB and it contains 500M documents.
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