Pre-populate an inline FormSet?

Question

I\'m working on an attendance entry form for a band. My idea is to have a section of the form to enter event information for a performance or rehearsal. Here\'s the model

Answer 1

I'm having the same problem. I'm using Django 1.9, and I've tried the solution proposed by Simanas, overriding the property "empty_form", adding some default values in de dict initial. That worked but in my case I had 4 extra inline forms, 5 in total, and only one of the five forms was populated with the initial data.

I've modified the code like this (see initial dict):

class MyFormSet(forms.models.BaseInlineFormSet):
    model = MyModel

    @property
    def empty_form(self):
        initial = {'model_attr_name':'population_value'}
        if self.parent_obj:
            initial['name'] = self.parent_obj.default_child_name
        form = self.form(
            auto_id=self.auto_id,
            prefix=self.add_prefix('__prefix__'),
            empty_permitted=True, initial=initial
        )
        self.add_fields(form, None)
        return form    

class MyModelInline(admin.StackedInline):
    model = MyModel
    formset = MyFormSet

    def get_formset(self, request, obj=None, **kwargs):    
        formset = super(HostsSpaceInline, self).get_formset(request, obj, **kwargs)
        formset.parent_obj = obj
        return formset

If we find a way to make it work when having extra forms, this solution would be a good workaround.