ValueError: Expected singleton

Question

hello, I just start coding with odoo13, and I have a comput field in the module and I want to show it on the tree view but ValueError: Expected singleton appear
In odoo 9, I used @api.one decorator, but for odoo 13 I make same reaserch  to resolve this error but I cannot resolve it.
This is the fonction of the comput field:
@api.depends('num_cour', 'num_b','num_da', 'abr_sect')
def _get_name(self):     self.num_cour = ' N° '+ (self.num_b or '') + '/' + (self.num_da or '') + '/' + (self.abr_sect

Gerson Carranza · Accepted Answer

this happens when you get more than 1 record in a variable that expects 1 record
try this:

@api.depends('num_cour', 'num_b', 'num_da', 'abr_sect')
def _get_name(self):
for rec in self:
rec.num_cour = ' N° ' + (rec.num_b or '') + '/' + (rec.num_da or '') + '/' + (rec.abr_sect or '')
num_cour = fields.Char(string='N cr', compute='_get_name', readonly=True)

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