How to make the button invisible when a many2many field is empty

Question

Hi Odooers,
I want  "Btn eval" to be invisible when "QA Checking products" field (a many2many field) is empty.
With codes below, the "Btn eval" is still showing. Please correct me if I am wrong in the xml codes
invisible="qa_check_product_ids == False"

Cybrosys Techno Solutions Pvt.Ltd · Accepted Answer

Hello,
You could try this instead:invisible="not qa_check_product_ids"

Hope it helps.

Odoo learner · Answer

Thank all of you. I use the following and now the result is expected.
invisible="not qa_check_product_ids"

Dương Nguyễn · Answer

You can try
"not qa_check_product_ids". Normally relation field like many2one or x2m will use "not"

Matthias Enderle · Answer

Hi,
The expression qa_check_product_ids == False won't work as expected because many2many fields are represented by a list, and an empty list is not equal to False. Instead, you need to check if the list is empty.
You can try it like that:

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