BackendlessFault{ code: '8001', message: 'Duplicate property' }

Android
1

Hi.

During saving an object Backendless returns this error. Posted class to support@backendless.com.

2

Hi Denys,

Is there a property name is the error message? In the server code I see that there should be one.

If not, please provide a code sample to reproduce this error.

3

Vehicles property

4

Well this means that you defined this property as unique and you already have an object with such property. Just as the error message says.

5

I fetched an object from backendless, update it and save it

6

Can you provide a code you use? The approach you describe will work fine as long as you keep the same objectId.

7

Sent the code to support mail.

8

Hi Sergey,

Any updates?

9

When I had commented “problematic” property and tried to save an object, Backendless returned the following error: “Metadata key cannot be NULL.”.

10

The “duplicate property” error would occur when you have a unique constraint on a column and save an object which violates the constraint (because another object has the same value for the unique column).

I believe, the “Metadata key cannot be NULL” error is sent from your server-side code.