[fix] Dashboard: Fixed group_by target_link

Added __exact to the target_link of group_by dashboard
elements, this allows to show the filters in the
target page pre-selected with the chosen value, eg:

When clicking on the applied config status,
not only the page shows all the devices which have
their config applied but also shows the
Configuration Status filter with the "applied"
value already pre-selected (which was not happening
before this change).

Author: nemesifier

openwisp_utils/admin_theme/dashboard.py

@@ -184,7 +184,9 @@ def get_dashboard_context(request):
                 if value.get('colors') and qs_key in value['colors']:
                     colors.append(value['colors'][qs_key])
                 values.append(obj['count'])
-            value['target_link'] = f'/admin/{app_label}/{model_name}/?{group_by}='
+            value[
+                'target_link'
+            ] = f'/admin/{app_label}/{model_name}/?{group_by}__exact='
 
         if aggregate:
             for qs_key, qs_value in qs.items():

tests/test_project/tests/test_dashboard.py

@@ -144,6 +144,7 @@ def test_index_content(self):
         self.assertContains(response, 'Operator presence in projects')
         self.assertContains(response, 'with_operator')
         self.assertContains(response, 'without_operator')
+        self.assertContains(response, 'project__name__exact')
 
         with self.subTest('Test no data'):
             Project.objects.all().delete()