default value for another field from date invoice

Question

I want to get default value from  date invoice but not succes, Thanks for your answer
My code is:
@api.depends ( 'date_invoice' )    def  _default_date ( self ):      self .tanggal =  self .date_invoice
tanggal = fields.Date(        string = 'Tanggal' , default = lambda  self : self ._default_date,  readonly = False )

Aslam Up · Accepted Answer

Hi awar,
Use related fields !

tanggal = fields.Date(string='Tanggal', related='date_invoice', readonly=False)

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