Is correct this method sintaxis? Please HELP

Question

Hello, I have a function that should validate that a product is of type ' Service' . When this condition is met the ' sequence' field must increase its value sequentially.  This method is written in the sale.order.line model.
Please if this function is badly implemented , tell me I can do to correct it.
I hope tips and suggestions thank you very much. Thanks
@api.depends('product_id.product_tmpl_id.type')
def _niu_validation(self):
if product_id.product_tmpl_id.type == 'service':
sequence= self.

Axel Mendoza · Answer

@Charlie
No return is needed from that function and you should use self.product_id if you call it that function using a recordset(also take care of multiple records in the recorset like iterate over self) or pass the product_id to the function if you call the function directly, like:
@api.depends('product_id.product_tmpl_id.type')
def _niu_validation(self, *product_id*):
if *product_id*.type == 'service':
sequence= self.env['ir.sequence'].next_by_code('sale.order.line')

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