How to pass initial parameter to django's ModelForm instance?

Question

The particular case I have is like this:

I have a Transaction model, with fields: from, to (both are ForeignKeys to auth.Use

Answer 1

In http://www.djangobook.com/en/2.0/chapter07/ , the section Setting Initial Values describes how to use the initial parameter to the Form constructor. You may also do extra stuff in the __init__ method of your derived Form.