[fix] Remove Filter class

Author: dee077

openwisp_controller/config/api/filters.py

@@ -4,7 +4,6 @@
 from django_filters import rest_framework as filters
 from django_filters.rest_framework import DjangoFilterBackend
 from rest_framework.exceptions import ValidationError
-from reversion.models import Version
 from swapper import load_model
 
 from openwisp_users.api.filters import OrganizationManagedFilter
@@ -143,18 +142,3 @@ def __init__(self, *args, **kwargs):
 
     class Meta(BaseConfigAPIFilter.Meta):
         model = DeviceGroup
-
-
-class ReversionFilter(BaseConfigAPIFilter):
-    model = filters.CharFilter(field_name='content_type__model', lookup_expr='iexact')
-
-    def _set_valid_filterform_labels(self):
-        self.filters['model'].label = _('Model')
-
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-        self._set_valid_filterform_labels()
-
-    class Meta:
-        model = Version
-        fields = ["model"]