Making a button invisible depending on the state is quite easy:
'invisible': Eval('state') == 'closed'
But how can I make a button invisible depending on the value of a relation
Field? I have a Many2One field which can be null, and if it is not null I
want to hide the button.
My idea would be to use an expression like the following:
'invisible': Eval('invoice', None) != None
But this doesn't work. Is there a way to hide a button depending on a
relation Field? Or I have to create a new state and then hide the button
depending on the state?
Thanks
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