OKRS24-220 Fixed Data Source filter.

Author: dmytrotsko

src/signals/filters.py

@@ -48,7 +48,9 @@ class SignalFilter(django_filters.FilterSet):
     )
     format_type = django_filters.MultipleChoiceFilter(choices=FormatChoices.choices)
     severenity_pyramid_rungs = django_filters.MultipleChoiceFilter(choices=SeverityPyramidRungsChoices.choices)
-    source = django_filters.ModelMultipleChoiceFilter(queryset=SourceSubdivision.objects.all())
+    source = django_filters.ModelMultipleChoiceFilter(queryset=SourceSubdivision.objects.all(),
+                                                      field_name="source_id__external_name",
+                                                      to_field_name='external_name')
     time_type = django_filters.MultipleChoiceFilter(choices=TimeTypeChoices.choices)
 
     def __init__(self, data, *args, **kwargs):