Manipulate the form field values before rendering in django admin

I have to actually reset the values of the fields of a model Form, every time the form is rendered. So, lets say everytime a user fills the form, I store the values to a different table and next time when the form is rendered the values are reset to specified data. Again, when the user saves the fo开发者_开发知识库rm, the values are added to the different table and so no. This is quite weird but I need to implement this.

So, how am I supposed to reset the values of a model form before the form is displayed. Definitely, the model belonging to that form is updated with the new values everytime. But I need to reset them when rendered again for edit.

Let me pinpoint what I actually need. I need to override the field values during edit. So if a model was saved with field A having value 'value1'. I need to change this field's value to 'specified value' during edit. So even if the user then changes it to value 2 and saves it. During edit, I again want to have the value set to 'specified value' in the rendered form. It is independent of the values in the database

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You can set form values using initial value:

form = MyForm(initial={'field1': value1, 'field2': value2, 'field3': value3})