Custom Server API call creating object instead of updating existing

Data Service
1

I have built a custom Java API with a call to update an existing record. It does a find for the record, finds it, updates the field, then does a save. Unfortunately the save generates a new record instead of updating the existing. I’ve made sure the class has a full set of getters/setters and the default constructor.

Here’s my log output.

searching for? CA87360A-06CF-466D-FFCE-306C3BDE5400
records found 3
existing record? Optional[DeviceUsage{Id=‘3D839E06-C647-76EC-FF35-F6939C33CC00’, DeviceId=‘0D4A9057-B9D8-95AA-FF36-8229B0339000’, MobileDeviceId=‘CA87360A-06CF-466D-FFCE-306C3BDE5400’, UsageCount=4}]
Trying to update existing Device Usage DeviceUsage{Id=‘3D839E06-C647-76EC-FF35-F6939C33CC00’, DeviceId=‘0D4A9057-B9D8-95AA-FF36-8229B0339000’, MobileDeviceId=‘CA87360A-06CF-466D-FFCE-306C3BDE5400’, UsageCount=4}
Trying to update existing Device Usage DeviceUsage{Id=‘3D839E06-C647-76EC-FF35-F6939C33CC00’, DeviceId=‘0D4A9057-B9D8-95AA-FF36-8229B0339000’, MobileDeviceId=‘CA87360A-06CF-466D-FFCE-306C3BDE5400’, UsageCount=5}
Trying to save Device Usage DeviceUsage{Id=‘3D839E06-C647-76EC-FF35-F6939C33CC00’, DeviceId=‘0D4A9057-B9D8-95AA-FF36-8229B0339000’, MobileDeviceId=‘CA87360A-06CF-466D-FFCE-306C3BDE5400’, UsageCount=5}
Device Saved:DeviceUsage{Id=‘3D839E06-C647-76EC-FF35-F6939C33CC00’, DeviceId=‘0D4A9057-B9D8-95AA-FF36-8229B0339000’, MobileDeviceId=‘CA87360A-06CF-466D-FFCE-306C3BDE5400’, UsageCount=5}

It does a search by criteria, finds 3 that match, then filters for the single record that matches exactly. After that the log shows the record, with a “UsageCount = 4”, increments the count to 5, then attempts to save it back to the database, and even says it saved successfully. However, instead of updating, it creates a new one (see the DB screenshot. 2nd highlighted row should’ve update instead of 1st highlighted row being generated)

Screen Shot 2020-05-05 at 5.25.28 PM
Screen Shot 2020-05-05 at 5.25.28 PM1593×242 40.5 KB

Thanks, Mark

2

Hi @Mark_Moline,

Make sure the class you use to represent the retrieved objects declares either the
public String objectId field
or
public String getObjectId() and
public void setObjectId( String value ) getter/setter methods.

Please let me know if that solves the problem.

The reason the code saves a new object is the save operation checks whether objectId is present or not. If it is not present, Backendless will save a new object, otherwise, it will update the existing one.

Regards,
Mark

3

Mark, thanks. I have a mapping from objectId to Id. See below. To confirm, I need to keep the objectId mapping exact and cannot rename this field in any way?

Screen Shot 2020-05-05 at 5.34.16 PM
Screen Shot 2020-05-05 at 5.34.16 PM800×254 16.9 KB

FYI. i did the change and this appears to be correct. Thanks!

Screen Shot 2020-05-05 at 5.38.15 PM
Screen Shot 2020-05-05 at 5.38.15 PM766×244 16.2 KB

4

Correct. The objectId, created and updated properties are somewhat special and should not be renamed through mapping. I’ll make sure we update the docs to say that.

Cheers,
Mark