python - Django: How to pre-populate FormView with dynamic (non-model) data?

Question

I have a FormView view, with some additional GET context supplied using get_context_data():

class SignUpView(FormView):
    template_name = 'pages_fixed/accounts/signup.html'
    form_class = SignUpForm

    def get_context_data(self, **kwargs):
        context = super(SignUpView, self).get_context_data(**kwargs)
        context = {
            'plans':    common.plans,
            'pricing':  common.pricing,
        }
        return context

This works fine. However, I also have some values in session (not from any bound model) which I would like to pre-populate into the form. These vary depending on user's actions on previous page(s). I know (from my other post) that I can pass the form into the context (with initial=) but is it possible in a FormView situation per above?

Answer 1

You can override the FormView class's 'get_initial' method. See here for more info,

e.g.

def get_initial(self):
    """
    Returns the initial data to use for forms on this view.
    """
    initial = super().get_initial()

    initial['my_form_field1'] = self.request.something

    return initial

'get_initial' should return a dictionary where the keys are the names of the fields on the form and the values are the initial values to use when showing the form to the user.