How to set states on a group element

[fransuar (Francisco Maria Moyano Casco)]

Good afternoon,
I am trying to set a group into invisible trough the states property on tryton 5.0.

We have done something like this, but it gives me some error

<field name="has_signs"/>
<group string="Signs" id="contact_signs" colspan="4" states="{'invisible': Not(Bool(Eval('has_signs')))}">
 (......)
 </group>

The traceback last line gives me this
JSONDecodeError: Expecting property name enclosed in double quotes: line 1 column 2 (char 1)

Is there any example on any module to get some idea on how it works?

Thanks

[pokoli (Sergi Almacellas Abellana)]

You can not use PYSON statements on XML fileds without encoding them.
In order to do so you should use the view_attributes method of the class to do so. There is an example on the account_invoice module.

Hope it helps.

[fransuar (Francisco Maria Moyano Casco)]

@pokoli

You can not use PYSON statements on XML fileds without encoding them.
In order to do so you should use the view_attributes method of the class to do so. There is an example on the account_invoice module .

Hope it helps.

It was!!! Thank you very much.
The result is

@classmethod
def view_attributes(cls):
    return [('/form/group[@id="contact_signs"]', 'states', {
                'invisible':Not(Bool(Eval('has_signs'))),
            })]