How to use django-filter to add a DRF filter using dates and slugs

django-filter-sample.py

class SampleFilter(filters.FilterSet):
    start_date = django_filters.DateFilter(name="date", lookup_type='gte')
    end_date = django_filters.DateFilter(name="date", lookup_type='lte')
    # How to filter by a foreign key that uses slug as a lookup
    foo = django_filters.ModelMultipleChoiceFilter(
        queryset=MyModel.objects.all(),
        to_field_name='slug',
        conjoined=True,
    )
    class Meta:
        model = TradingSystemDataPoint
        fields = ['date', 'start_date', 'end_date', 'foo', ]