Ensure results are distinct when applying a filter, there may be n:m relations around

Author: matthiask

feincms3_data/data.py

@@ -81,7 +81,7 @@ def specs_for_app_models(app, spec=None):
 def _model_queryset(spec):
     queryset = apps.get_model(spec["model"])._default_manager.order_by("pk")
     if f := spec.get("filter"):
-        queryset = queryset.filter(**f)
+        queryset = queryset.filter(**f).distinct()
     return queryset