VED-740: convert fhir model into json

Author: Akol125

backend/src/fhir_controller.py

@@ -102,7 +102,7 @@ def get_immunization_by_identifier(self, aws_event) -> dict:
         try:
             if resource := self.fhir_service.get_immunization_by_identifier(
                 identifiers, imms_vax_type_perms, identifier, element):
-                return FhirController.create_response(200, resource)
+                return FhirController.create_response(200, json.dumps(resource))
         except UnauthorizedVaxError as unauthorized:
             return self.create_response(403, unauthorized.to_operation_outcome())
 

backend/src/models/utils/generic_utils.py

@@ -180,7 +180,7 @@ def form_json(response, _element, identifier, baseurl):
 
     fhir_bundle.entry = [entry]
     fhir_bundle.total = 1
-    return fhir_bundle
+    return fhir_bundle.dict(by_alias=True)
 
 
 def check_keys_in_sources(event, not_required_keys):