Adding a Django-filters widget or class override to allow passing a list instead of a csv formated string for fitlers

[AMontagu]

As Django filters is based on query params it only support string format and then convert it.
As DSG use gRPC we can pass more complex type.
It could be a good idea to let user passing a list directly without having it to convert in CSV format.

As is it not prioritary it will not be set for the 1.0.0 and mostly will be an how-to in the doc or an external package. As so we are looking for contributors to help us with that.

[legau]

There is already QueryArrayWidget working with arrays

[AMontagu]

Not exactly

If you look at the comment under the QueryArrayWidget: https://github.com/carltongibson/django-filter/blob/a2f7aba4e9aca9d6e9fc1f2ddc554daf87e8457e/django_filters/widgets.py#L240

It allow to transform string to array. What we want here is to directly deal with array. It may work if we pass directly MultiValueDict to the widget but we want to pass array to it.