prisma: how to truncate all mongo collections? - mongodb

Question

In a node backend we're using prisma to access a mongo db, and for automated integration testing I'd like to reset the db at the beginning of each test. Prisma's roadmap has planned a reset feature for the mongo connector but they're not there yet, so I need to implement the reset myself.
For my purposes it would be sufficient to drop all the documents in the collections -- I don't need to reset schemas, indexes, etc. What's the best way to do this?
I've found an approach that seems to work using prisma's runCommandRaw as follows, but I'm unsure of its limitations or failure modes. (And it seems like there should be a more prisma-ish way to iterate through the models/collections, but I haven't found it yet -- perhaps I'm overlooking something.)
Any improvements, alternatives, or warnings about this approach would be very helpful.
import { PrismaClient } from '#prisma/client';
const getAllCollectionNames = async (prisma: PrismaClient): Promise<string[]> => {
// This seems to return a cursor-like object, implying that there may
// be more results. If that's the case, can we use $runCommandRaw to
// paginate through the complete set of collections?
const queryResult = await prisma.$runCommandRaw({
listCollections: 1.0,
authorizedCollections: true,
nameOnly: true,
});
// #ts-ignore
return queryResult.cursor.firstBatch.map((coll: any) => coll.name);
};
const deleteAllFromCollection = async (prisma: PrismaClient, name: string): Promise<void> => {
await prisma.$runCommandRaw({
delete: name,
deletes: [
{
q: {},
limit: 0, // (no limit, delete everything))
},
],
});
};
export const truncateAllCollections = async (prisma: PrismaClient): Promise<void> => {
const collectionNames = await getAllCollectionNames(prisma);
for (const name of collectionNames) {
await deleteAllFromCollection(prisma, name);
}
};