Null check operator used on a null value when parsing ResourceType

[luis901101]

I'm basically working on my app UI presentation and every time I make a change on how a ListView item would look like and hot-reload it, the FHIR fetch fails with NPE.

This is the stacktrace:

Null check operator used on a null value
#0      Resource.resourceTypeToString (package:fhir/r4/resource/resource.dart:162:36)
#1      enumToString (package:fhir_at_rest/enums/enums_to_string.dart:25:26)
#2      FhirRequest._url.<anonymous closure> (package:fhir_at_rest/r4/fhir_request.dart:1649:32)
#3      _$FhirSearchRequestImpl.map (package:fhir_at_rest/r4/fhir_request.freezed.dart:8821:18)
#4      FhirRequest._url (package:fhir_at_rest/r4/fhir_request.dart:1622:20)
#5      FhirRequest.uri (package:fhir_at_rest/r4/fhir_request.dart:1550:18)
#6      FhirRequest.request.<anonymous closure> (package:fhir_at_rest/r4/fhir_request.dart:1042:19)
#7      _$FhirSearchRequestImpl.map (package:fhir_at_rest/r4/fhir_request.freezed.dart:8821:18)
#8      FhirRequest.request (package:fhir_at_rest/r4/fhir_request.dart:970:69)
#0      Resource.resourceTypeToString (package:fhir/r4/resource/resource.dart:162:36)
#1      enumToString (package:fhir_at_rest/enums/enums_to_string.dart:25:26)
#2      FhirRequest._url.<anonymous closure> (package:fhir_at_rest/r4/fhir_request.dart:1649:32)
#3      _$FhirSearchRequestImpl.map (package:fhir_at_rest/r4/fhir_request.freezed.dart:8821:18)
#4      FhirRequest._url (package:fhir_at_rest/r4/fhir_request.dart:1622:20)
#5      FhirRequest.uri (package:fhir_at_rest/r4/fhir_request.dart:1550:18)
#6      FhirRequest.request.<anonymous closure> (package:fhir_at_rest/r4/fhir_request.dart:1042:19)
#7      _$FhirSearchRequestImpl.map (package:fhir_at_rest/r4/fhir_request.freezed.dart:8821:18)
#8      FhirRequest.request (package:fhir_at_rest/r4/fhir_request.dart:970:69)
.......

Then when I go to the exact class and line that it's pointed (package:fhir/r4/resource/resource.dart:162:36) I've found this:

static String resourceTypeToString(R4ResourceType type) =>
      resourceTypeToStringMap[type]!;

I've checked and that Map contains the Appointment which is the ResourceType I'm fetching and in fact I'm sure of it because before hot-reload it fetches just fine, moreover if I hot-restart it also fetches just fine.

Anyway, that line: resourceTypeToStringMap[type]! and the logic behind it seems a bit tricky, I mean, there is not need to use a Map for parsing an enum to String, it should be enough just to: type.name and also is not recommended at all to use ! when getting a value from a Map.