i add giftmessage form attribute "my_test" when i click updte button return 500 error

[LifeAsBook]

POST http://127.0.0.1/m202/rest/default/V1/carts/mine/gift-message 500 (Internal Server Error)
Property "MyTest" does not have corresponding setter in class "Magento\GiftMessage\Api\Data\MessageInterface".

but i have already add extension_attributes.xml code
<extension_attributes for="Magento\GiftMessage\Api\Data\MessageInterface">

</extension_attributes>

[ishakhsuvarov]

@LifeAsBook Please clear Magento caches and try again. If the issue persists, please let us know what did you add to extension_attributes.xml and which payload are you using for the POST request.

[LifeAsBook]

@ishakhsuvarov my mean is if i have to extension_attributes that "my_test" , should i use "my_test" or "extension_attributes" in the front form name?

[ishakhsuvarov]

@LifeAsBook If I understand you correctly it should be "my_test" under "extension_attributes", however code sample would be helpful to clarify things.

[LifeAsBook]

@ishakhsuvarov

this updte button is call http://127.0.0.1/m202/rest/default/V1/carts/mine/gift-message
and method is Magento\GiftMessage\Api\CartRepositoryInterface::save($cartId, \Magento\GiftMessage\Api\Data\MessageInterface $giftMessage);

I'm sorry extension_attributes is not extends_attribute

[veloraven]

@LifeAsBook is this issue still actual?
If it is please specify Magento version.
If it is not please close this ticket.

[veloraven]

According to contributor guide, tickets without response for two weeks should be closed.
If this issue still reproducible please feel free to create the new one: format new issue according to the Issue reporting guidelines: with steps to reproduce, actual result and expected result and specify Magento version.