Horizon displays an error message on an empty instances list page

[Roman Lubianyi]

The following error is observed in the Horizon log:
Unable to connect to Neutron: 'frozenset' object has no attribute '_getitem_'

The error happens on the network_list requests when the parameter list is too long. This is the failing line
https://github.com/openstack/horizon/blob/stable/ocata/openstack_dashboard/api/neutron.py#L629

The workaround could look like this

resources = []
filter_values = list(filter_values)
for i in range(0, len(filter_values), chunk_size):
params[filter_attr] = filter_values[i:i + chunk_size]
resources.extend(list_method(**params))
return resources

[Roman Lubianyi (rlubianyi)]

https://review.fuel-infra.org/#/c/40348/

[Pavel Glazov (pglazovv)]

Verified.
root@node-1:~# cat /usr/lib/python2.7/dist-packages/openstack_dashboard/api/neutron.py | grep "if not isinstance"
        if not isinstance(filter_values, (list, tuple, set, frozenset)):

[Denis Meltsaykin (dmeltsaykin)]

Reopened, the issue is not fixed yet.

[Roman Lubianyi (rlubianyi)]

https://review.fuel-infra.org/#/c/41091/

[Mikhail Samoylov (msamoylov)]

Verified
root@node-1:~# cat /usr/lib/python2.7/dist-packages/openstack_dashboard/api/neutron.py | grep "filter_values = list(filter_values)"
            filter_values = list(filter_values)