[#429] Fix labels search

contributors/views/generic_list_views/issues.py

@@ -38,8 +38,8 @@ class ListView(
         queryset=ContributionLabel.objects.all(),
     )
 
-    def get_queryset(self):
-        """Add queryset."""
+    def get_queryset(self):  # noqa: WPS615
+        """Get the initial queryset and apply all filters."""
         queryset = (
             Contribution.objects.filter(type='iss').
             select_related('repository', 'contributor', 'info').
@@ -48,6 +48,8 @@ def get_queryset(self):
                 self.contributionlabel_prefetch,
             ).distinct()
         )
+        self.queryset = queryset
+        queryset = super().get_queryset()
         self.filterset = self.filterset_class(
             self.request.GET,
             queryset=queryset,

contributors/views/mixins.py

@@ -170,15 +170,16 @@ def get_queryset(self):  # noqa: WPS615
 class ContributionLabelsMixin(object):
     """A mixin for labels."""
 
-    def get_queryset(self):  # noqa: WPS615
-        """Get a dataset."""
+    def get_queryset(self):
+        """Get a dataset and apply label filters if any."""
+        queryset = super().get_queryset()
         labels_param = self.request.GET.get('contribution_labels')
         if labels_param:
             labels_param = labels_param.split('.')
-            self.queryset = self.queryset.filter(
+            queryset = queryset.filter(
                 labels__name__lower__in=labels_param,
-            )
-        return super().get_queryset()
+            ).distinct()
+        return queryset
 
 
 class ContributorTotalStatMixin(object):