Remove all topic.tag_ids from database (#1901)

global/data/example-data.json

@@ -1,5 +1,5 @@
 {
-    "_migration_index": 46,
+    "_migration_index": 47,
     "organization": {
         "1": {
             "id": 1,

global/data/initial-data.json

@@ -1,5 +1,5 @@
 {
-    "_migration_index": 46,
+    "_migration_index": 47,
     "organization": {
         "1": {
             "id": 1,

openslides_backend/migrations/migrations/0046_fix_topic_tag_ids_error.py

@@ -0,0 +1,27 @@
+from typing import Any, Dict, List, Optional
+
+from datastore.migrations import BaseModelMigration
+from datastore.writer.core import BaseRequestEvent, RequestUpdateEvent
+
+from openslides_backend.shared.patterns import fqid_from_collection_and_id
+
+
+class Migration(BaseModelMigration):
+    """
+    Remove all topic.tag_ids from database
+    """
+
+    target_migration_index = 47
+
+    field = "tag_ids"
+
+    def migrate_models(self) -> Optional[List[BaseRequestEvent]]:
+        events: List[BaseRequestEvent] = []
+        db_models = self.reader.get_all("topic")
+        for id, model in db_models.items():
+            if self.field in model:
+                update: Dict[str, Any] = {self.field: None}
+                events.append(
+                    RequestUpdateEvent(fqid_from_collection_and_id("topic", id), update)
+                )
+        return events

tests/system/migrations/test_0046_fix_topic_tag_ids_error.py

@@ -0,0 +1,17 @@
+def test_migration(write, finalize, assert_model):
+    write(
+        {
+            "type": "create",
+            "fqid": "topic/61",
+            "fields": {"id": 61, "tag_ids": [], "title": "topic61 with empty tag ids"},
+        },
+    )
+    finalize("0046_fix_topic_tag_ids_error")
+
+    assert_model(
+        "topic/61",
+        {
+            "id": 61,
+            "title": "topic61 with empty tag ids",
+        },
+    )