What Causes Method Errors Related to Python Decorators in Odoo?

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Problem: Incorrect or missing decorators like @api.model, @api.multi, and @api.onchange can lead to method errors or failures.

Solution:
Use @api.model for methods that create or update records.
Use @api.multi for methods that need to operate on multiple records.
Use @api.onchange for fields that trigger updates when their values change.

Always ensure decorators align with the method's purpose to avoid unexpected behavior.

@api.model
def create_record(self, values):
    return super(CustomModel, self).create(values)

@api.onchange('field_name')
def _onchange_field_name(self):
    if self.field_name:
        self.related_field = self.field_name * 2

@api.multi
def update_records(self, values):
    for record in self:
        record.write(values)

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