Performance: support passing selection data with filtered document requests (#12300)

src/documents/tests/test_api_documents.py

@@ -1144,6 +1144,56 @@ class TestDocumentApi(DirectoriesMixin, DocumentConsumeDelayMixin, APITestCase):
         self.assertEqual(len(response.data["all"]), 50)
         self.assertCountEqual(response.data["all"], [d.id for d in docs])
 
+    def test_list_with_include_selection_data(self) -> None:
+        correspondent = Correspondent.objects.create(name="c1")
+        doc_type = DocumentType.objects.create(name="dt1")
+        storage_path = StoragePath.objects.create(name="sp1")
+        tag = Tag.objects.create(name="tag")
+
+        matching_doc = Document.objects.create(
+            checksum="A",
+            correspondent=correspondent,
+            document_type=doc_type,
+            storage_path=storage_path,
+        )
+        matching_doc.tags.add(tag)
+
+        non_matching_doc = Document.objects.create(checksum="B")
+        non_matching_doc.tags.add(Tag.objects.create(name="other"))
+
+        response = self.client.get(
+            f"/api/documents/?tags__id__in={tag.id}&include_selection_data=true",
+        )
+
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertIn("selection_data", response.data)
+
+        selected_correspondent = next(
+            item
+            for item in response.data["selection_data"]["selected_correspondents"]
+            if item["id"] == correspondent.id
+        )
+        selected_tag = next(
+            item
+            for item in response.data["selection_data"]["selected_tags"]
+            if item["id"] == tag.id
+        )
+        selected_type = next(
+            item
+            for item in response.data["selection_data"]["selected_document_types"]
+            if item["id"] == doc_type.id
+        )
+        selected_storage_path = next(
+            item
+            for item in response.data["selection_data"]["selected_storage_paths"]
+            if item["id"] == storage_path.id
+        )
+
+        self.assertEqual(selected_correspondent["document_count"], 1)
+        self.assertEqual(selected_tag["document_count"], 1)
+        self.assertEqual(selected_type["document_count"], 1)
+        self.assertEqual(selected_storage_path["document_count"], 1)
+
     def test_statistics(self) -> None:
         doc1 = Document.objects.create(
             title="none1",