Is there a way to count the number of records in a one2many field?
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use len like..
so = self.pool.get('sale.order').browse(cr, uid, id)
count = len(so.order_line)
hope it helps
edit after comment:
also need to check if there is an object like:
count = so.order_line and len(so.order_line) or 0
I tried this but I get this error: object of type 'bool' has no len()
Try using _constraints.
def _check_batch_limit(self, cursor, user, ids, context=None):
for record in self.browse(cursor, user, ids, context=context):
//limit is set as 18 or 20
if len(record.student_registrations) > record.limit:
return False
return True_constraints = [
(_check_batch_limit, 'Error:Limit reached.', ['student_registrations']),
]
I am sorry for my question... but does this code get the limit value from a field in the form?
This code does not work. Why did you accept the answer?
@Abdullah, No one will provide you exact code changes for your problem. We can only provide how this can be achieved. and VOTE is different from ACCEPT.
yes. I obtained the limit value from "LIMIT" field at FORM view.
Sorry for my previous comments. You were absolutely right from the start. Thanks you Atchuthan.
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@abdullah What exactly you want to achieve by knowing the count of one2many fields?
I have two classes : (batches) & (batches.registrations) In (batches), I have a one2many field called "student_registrations" pointing to (batches.registrations) and showing the student registrations for this batch. However, I can only register 18 to 20 students as per the capacity of the classroom. I need to know how to limit the number of student registrations per batch in the one2many field once the registrations reach 18 or 20.
Related topic link https://www.odoo.com/forum/help-1/question/how-set-limit-for-number-records-of-x2many-6627 https://www.odoo.com/forum/help-1/question/how-to-limit-the-total-number-values-for-a-one2many-field-49700