Error throws on clicking the plus button at Many2Many list

Support Developer
1

I have 3 related classes:
The 1st is:

class Note(ModelSQL, ModelView):
    'Note'
    __name__ = 'ltl.common.note'

    date = fields.Date('Date', required=True, states={
        'readonly': True
    })

    note = fields.Text('Note')

    @classmethod
    def default_date(cls):
        return datetime.today()

The 2nd is:

class ProjectNote(ModelSQL, ModelView):
    'Project Note'
    __name__ = 'ltl.project.note'

    project = fields.Many2One('ltl.project', 'Project', required=True)
    
    note = fields.Many2One('ltl.common.note', 'Note', required=True)

The 3rd is:

class Project(ModelSQL, ModelView):
    'Project'
    __name__ = 'ltl.project'

    name = fields.Char('Name', required=True)

    remarks = fields.Many2Many('ltl.project.note', 'project', 'note', 'Remarks',
        states={
            'readonly': Eval('id', -1) < 0
        },
        depends=['id'],
        domain=[
            ('project', '=', Eval('id'))
        ]
    )

I dunno why, but the domain at remarks field in the 3rd class has cause:

[Mon Aug 25 17:27:29 2025] ERROR:trytond.protocols.dispatcher:ltl.common.note.search([[['project', '=', 1]], ...], 0, 1000, None, {'client': '706d045c-5270-40f...', 'language': 'en', 'language_directio...': 'ltr', 'groups': [1, 4]}) from admin@127.0.0.1/tryton/ in 0 ms [dispatcher.py:253]
Traceback (most recent call last):
  File "/home/tryton/project/.env/lib/python3.10/site-packages/trytond/protocols/dispatcher.py", line 216, in _dispatch
    result = rpc.result(meth(*c_args, **c_kwargs))
  File "/home/tryton/project/.env/lib/python3.10/site-packages/trytond/model/modelsql.py", line 1819, in search
    super().search(
  File "/home/tryton/project/.env/lib/python3.10/site-packages/trytond/model/modelstorage.py", line 711, in search
    check_domain(domain, cls, to_check)
  File "/home/tryton/project/.env/lib/python3.10/site-packages/trytond/model/modelstorage.py", line 695, in check_domain
    check_domain(d, cls, to_check)
  File "/home/tryton/project/.env/lib/python3.10/site-packages/trytond/model/modelstorage.py", line 695, in check_domain
    check_domain(d, cls, to_check)
  File "/home/tryton/project/.env/lib/python3.10/site-packages/trytond/model/modelstorage.py", line 674, in check_domain
    field = cls._fields[local]
KeyError: 'project'

Why is the domain cause error while in ltl.project.note it has project field?
When I take out the domain all are fine, its just listing the un-related notes which I don’t want it.

Bromo

2

The domain of a Many2Many field is on the target model not the relation model.
So I do not think you need this domain at all.

3

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