search field value from one module to another

Question

Hello. I cant solve one task:
I have menu called "limited dates" in module called "characteristics" where I can add certain dates and there is field in another module called first_payment_date. I need to set validation error when someone will set date simillar to "limited date" but its in another module. how can i solve this?

CandidRoot Solutions Private Limited · Answer

you can make a function like given below in model where first_payment_date defined:
@api.constrains('first_payment_date')
def _check_first_payment_date(self):
dates = self.env['limited.dates'].search([])
for rec in self:
if rec.date:
limited_date_id = self.env['limited.dates'].search([('limited_date','=',rec.date)])
if limited_date_id:
raise ValidationError(_("You cannot set date set in limited dates!"))

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