How to save default data in other fields of the table with POST request?

Question

Django

There is a model "goods" with the fields: "name", "income", "expenditure", "balance". on the page of the filling form there is only the name and parish. it is necessary that, along with the data of the name and income, the values ​​\u200b\u200bof the expense and balance fields are also saved in the database (in "expense" by default "0", in "residual" the same value as in "income")

Answer 1

Well, to prescribe logic in the view, no?