ModelChoiceFilter.to_field_name are not respected in contrib.django_filters #1443
Description
Describe the bug
When django filter is constructed by means of ModelChoiceFitler as following:
foo = filters.ModelChoiceFilter(queryset=models.Foo.objects.all(), to_field_name="name")
schema is incorrectly has type of int instead of usually expected string.
To Reproduce
See the snipped above.
Expected behavior
DjangoFilterExtension should introspect to_field_name argument if it exists for ModelChoiceFilter object while automatically discovers the schema.