Singleton error

Question

Hi, i encountered raise ValueError("Expected singleton: %s" % self) when computing age and working time
How to fix it
#computing age
@api.depends ( 'tanggal_lahir' )
def  _hitung_usia ( self ):
if  self .tanggal_lahir is not False :
self .usia = (datetime.today().date() - datetime.strptime( str ( self .tanggal_lahir) , '%Y-%m-%d' ).date()) // timedelta( days = 365 )
#computing working time
@api.depends ( 'mulai_bekerja' )
# @api.multi
def  _lama_bekerja ( self ):
if  self .mulai_bekerja:
years =

Malay Khamar · Accepted Answer

Hi Denny,
Please try to use a for loop in the function.
Like:
#computing age
@api.depends('birth_date')
def _count_age(self):
*  for record in self:*
if record.date_birth is not False:
record.age = (datetime.today().date() - datetime.strptime(str(record.date_birth),'%Y-%m-%d').date()) // timedelta(days=365)
else:
record.age = 0.0
#computing working time
@api.depends('start_work')
# @api.multi
def _long_work(self):
*  for record in self:*
if record.start_work:
years = relativedelta(date.today(),

John Gaitho · Answer

Hi Denny,
Singleton error occurs when you call self.some_field where self is a collection of records.  Instead, you should loop through the records like this;
for rec in self:
rec.some_field = ...

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