TestClient serialization of GET params with empty list as value

[code.djangoproject.com@…]

Problem:
When POST-ing a parameter whose value is the empty list, TestClient will strip that param-value pair out of the request entirely. In contrast to GET, which passes these along.

Expected behaviour:
They should work the same in the face of an empty list value.

See: ​https://github.com/django/django/pull/2268 for a patch making POST behave as GET.

[Aymeric Augustin]

As noted on the pull request, we may want to fix GET rather than POST.

In any case, they should behave similarly.

[Greg Chapple]

What is the desired behaviour here?

From what I can see, the difference lies with using django.utils.http.urlencode to process the get params.

>>> from django.utils.http import urlencode

>>> data = {'test': ['value1', 'value2']
>>> urlencode(data, doseq=True) 
'test=value1&test=value2'

>>> data = {'test': []}
>>> urlencode(data, doseq=True)
''

[Florian Apolloner]

From my gut I'd say that empty lists should get stripped out entirely, cause there is no way to represent an empty list, "?test=" would be interpreted as a list with one empty item in .getlist which makes no sense.