We no longer need to annotate the type of objects returned
from queries since django-stubs plugin infers that already.
Signed-off-by: Zixuan James Li <p359101898@gmail.com>
This commit adds do_change_can_remove_subscriber_group function for
changing can_remove_subscribers_group field of a stream. We also add
can_remove_subscribers_group_id field to stream and subscription
objects.
This function will be helpful for writing tests in next commit.
We would add API and UI support to change this setting in further
commits.
This commit removes "role" field from subscription
objects since we are not moving forward with stream
administrator concept and instead working on new
permssions model as per #19525.
Anders Kaseorg
Zixuan James Li
Sahil Batra
Steve Howell