在__init__之后但在清洁之前，在django中更改表单字段值

Question

I want to reset the value of some fields in my django form to None , inside the __init__ method of my form.

This is what I have so far:

class MyFormForm(forms.ModelForm):
    class Meta:
        model = MyModel
        fields = ['field1', ...]

    field1 = forms.IntegerField(max_value=100)

    def __init__(self, *args, **kwargs):
        values_changed = kwargs.pop('values_changed', False)
        super(MyFormForm, self).__init__(*args, **kwargs)
        self.data = self.data.copy()

        if not values_changed:
            for field in self.fields:
                self.data[field] = None

Unfortunately, when the form is displayed in my template, the value that has been POSTed is still in it. How do I get rid of the value, so that the change takes effect in the template, which renders the form?

Things that don't work:

• Setting the initial parameter. Since there is a value present, it will be ignored
• Using cleaned values. The form is not cleaned at this stage, since it is not valid. Because of this cleaned_data does not exist

I'm accessing the values like this:

{{ form.field1.value|default_if_none:"Please enter." }}

edit: I just tried

{{ form.data.field1|default_if_none:"Please enter." }}

no change.

Answer 1

I'm a moron. There were two forms, form and form_2 .

I used the wrong variable name. My bad. It works like it should with the code above.