ERROR: Unexpected type while converting value for JsonSerialization

[foolbear]

🌀 ERROR: Unexpected type while converting value for JsonSerialization: <CKRecordID: 0x1c4437260; recordName=BACAF2DF-2B84-4815-94F5-F246E27B5489, zoneID=_defaultZone:defaultOwner>
🌀 ERROR: Unexpected type while converting value for JsonSerialization: <CKReference: 0x1c4422ac0; recordID=<CKRecordID: 0x1c4233a00; recordName=53BA8280-6396-4A6D-9F51-40BF78D22FBE, zoneID=defaultZone:defaultOwner>>
09/22/2017 15:45:59:967 Reading)[380:.] EVCloudKitDao.swift(538) backupData(:toFile:):
Data is written to /var/mobile/Containers/Data/Application/1A249C94-6DD9-439F-8DA2-FB5BC17CADF7/Library/Caches/Filter_TraceReaderCount.bak)

[foolbear]

again when receive updated notification:

🌀 ERROR: Unexpected type while converting value for JsonSerialization: <CKRecordID: 0x1c02323e0; recordName=3A42AEB9-2D28-45D4-A9C1-2CABC6E1078A, zoneID=_defaultZone:defaultOwner>
🌀 ERROR: Unexpected type while converting value for JsonSerialization: <CKReference: 0x1c0434260; recordID=<CKRecordID: 0x1c022d600; recordName=0685F0F4-773D-48A0-9DC6-31AF16A9C59E, zoneID=_defaultZone:defaultOwner>>
🌀 ERROR: Unexpected type while converting value for JsonSerialization: <CKRecordID: 0x1c4233cc0; recordName=defaultOwner, zoneID=_defaultZone:defaultOwner>
🌀 ERROR: Unexpected type while converting value for JsonSerialization: <CKRecordID: 0x1c4420480; recordName=_1b94419f84876b737830ef6c97a09dba, zoneID=_defaultZone:defaultOwner>

[jstheoriginal]

This sounds to me like the data structure of the class in your app is different than the structure of the record in CloudKit, so it can't create an instance of your class.

[evermeer]

Sorry for the extremely late response:
If you output a class (record) using print then that class will be converted to json so that the output is readable. Default EVReflection capabilities are used for this conversion. CKRecordID and CKReference are special structs which need custom code for conversion. In the current situation it will output the debugDescription of that CKRecordID. For instance when you run the demo app you will see something like this in the output:

🌀 ERROR: Unexpected type while converting value for JsonSerialization: <CKRecordID: 0x1c00370a0; recordName=2F77B75C-065D-4A9B-BF8A-AFE02F0B63F5, zoneID=_defaultZone:__defaultOwner__>
01/26/2018 06:58:47:983 AppMessage)[1658:.] EVCloudKitDao.swift(398) createRecordTypes:
	saveItem Message = {
  "Asset_ID" : "",
  "ToFirstName" : "",
  "recordChangeTag" : null,
  "encodedSystemFields" : null,
  "To_ID" : "",
  "lastModifiedUserRecordID" : null,
  "FromLastName" : "",
  "Longitude" : 4.8653826999999996,
  "From_ID" : "",
  "modificationDate" : "2018-01-26 05:58:46+0000",
  "MessageType" : "T",
  "FromFirstName" : "",
  "Asset" : null,
  "From" : null,
  "Text" : "",
  "To" : null,
  "recordID" : "<CKRecordID: 0x1c00370a0; recordName=2F77B75C-065D-4A9B-BF8A-AFE02F0B63F5, zoneID=_defaultZone:__defaultOwner__>",
  "Latitude" : 52.8350711,
  "recordType" : null,
  "creationDate" : "2018-01-26 05:58:46+0000",
  "ToLastName" : "",
  "creatorUserRecordID" : null
}: 2F77B75C-065D-4A9B-BF8A-AFE02F0B63F5

You can see the recordID is not what you would expect. You would expect this:
  "recordID" : "2F77B75C-065D-4A9B-BF8A-AFE02F0B63F5",

I think I could solve this issue by adding the EVCustomReflectable protocol to the CKRecordID and CKReference. I will have a look at that.

[evermeer]

I have solved this in the EVReflection/CloudKit library which is a dependency of EVCloudKitDao. You will now also have a better from and to json conversion for CKRecordID fields.