Formset inside Formset

[rgreene]

Good day,

We have an inline formset where each instance of the form has a ManyToManyField for selecting countries. Here is the code:

# models

class Geographic_Scope_Region(models.Model):

    # class name exception (underscore) because ManyToManyField assumes pk is lower(Table_Name) + _id

    geographic_scope_region_id = models.AutoField(primary_key=True)

    issf_core = models.ForeignKey(Issf_Core)

    REGION_NAME = (

        ('Asia', 'Asia'),

        ('Africa', 'Africa'),

        ('Caribbean', 'Caribbean'),

        ('Europe', 'Europe'),

        ('Latin America', 'Latin America'),

        ('North America', 'North America'),

        ('Oceania', 'Oceania'),

        ('Other', 'Other'),

    )

    region_name = models.CharField(choices=REGION_NAME, max_length=100)

    region_name_other = models.CharField(max_length=100)

    countries = models.ManyToManyField(Country, db_table='geographic_scope_region_country', blank=True)

    class Meta:

        managed = False

        db_table = 'geographic_scope_region'

# forms

class GeographicScopeRegionForm(ModelForm):

    class Meta:

        model = Geographic_Scope_Region

        labels = {

            'region_name': 'Name of region',

            'region_name_other': 'Other region name',

            'countries': 'Select country(ies) (if applicable)',

        }

GeographicScopeRegionInlineFormSet = inlineformset_factory(Issf_Core, Geographic_Scope_Region, form=GeographicScopeRegionForm, extra=2)

# views

class GeographicScopeRegionUpdateView(UpdateView):

    model = Issf_Core

    form_class = GeographicScopeRegionInlineFormSet

    success_url = '/'

It works great and produces the following (simplified) output:

By changing the widget from the default SelectMultiple to CheckboxSelectMultiple, the countries multi-select list becomes a set of checkboxes, one for each of ~200 countries!

We're wondering if there's an easy way to instead use an inline formset for the countries, so that each form instance is a Select widget for picking one country?

Thanks in advance,

Randal