There s a bug on our backend that s making me do two graphql

Question

There s a bug on our backend that s making me do two graphql queries get get all the data needed for list of objects Query 1 Gives me an ID and some other info Query 2 Use ID to get additional data I d like to be able to `watch` for cache changes from both queries but I end up with a `Flow lt List lt Flow lt MyObject gt gt gt ` I d much rather have a `Flow lt List lt MyObject gt gt ` Code in thread

Nick · Answer

```apollo query LabReportsByPatientQuery recordStoreId fetchPolicy fetchPolicy watch mapNotNull it ApolloResponse lt LabReportsByPatientQuery Data gt gt it dataAssertNoErrors patient diagnosticReportSubject edgesFilterNotNull map edge gt edge node map nodes List lt LabReportsByPatientQuery Node gt gt nodes mapNotNull node gt try apollo query LabResultByIdQuery DiagnosticReport $ node labResultFragment id fetchPolicy fetchPolicy watch map convert to lab result catch ex Exception If there s an error translating the data to a lab result return null so its skipped null This flow is a Flow lt List lt Flow lt ApolloResponse lt LabResultByIdQuery Data gt gt gt gt ```

wasyl · Answer

I only glanced at your code but generally what you want is solved with a `flatMap`

Nick · Answer

Thanks i tried that but since the nodes is a `list` `flatMap` won t work in this situation

bod · Answer

maybe something like this ``` suspend fun lt T gt Flow lt List lt Flow lt T gt gt gt donkey Flow lt T gt = flow collect for subFlow Flow lt T gt in it emitAll subFlow ```

ephemient · Answer

I think it s more likely Nick wants something like ``` flatMap nodes List lt LabReportsByPatientQuery Node gt gt combine nodes mapNotNull node gt try apollo query LabResultByIdQuery DiagnosticReport $ node labResultFragment id fetchPolicy fetchPolicy watch map convert to lab result catch ex Exception If there s an error translating the data to a lab result return null so its skipped null it toList ``` this should result in a `Flow lt List lt ApolloResponse lt LabResultByIdQuery Data gt gt gt ` where each list is `nodes size` in size and contains one element from each inner flow

ephemient · Answer

but what kind of backend bug GraphQL is supposed to mean you don t need to do this kind of multi request merging on the client

Nick · Answer

Agreed There s something called a <https build fhir org task html|Task> and when I include it in the query it returns an empty array When I do a search using the ID I am able to get it

Nick · Answer

Thanks for your help guys slightly smiling face