Prepopulating inlines based on the parent model in the Django Admin

Question

I have two models, Event and Series, where each Event belongs to a Series. Most of the time, an Event\'s start_time is the same as its

Answer 1

I think you need to close a function over a ModelAdmin:

def create_event_form(series):
    class EventForm(forms.ModelForm):
        def __init__(self, *args, **kwargs):
            # You can use the outer function's 'series' here
    return EventForm

Here series will be the series instance. Then in the inline admin class:

class EventInlineAdmin(admin.TabularInline):
    model = Event
    def get_formset(self, request, obj=None, **kwargs):
        if obj:
            self.form = create_foo_form(obj)
        return super(EventInlineAdmin, self).get_formset(request, obj, **kwargs)

EDIT: This approach will enable you to pass your series object to the form where you can use it to set a default for your field.