Document.update() should accept fields set to None or empty

elasticsearch_dsl/_async/document.py

@@ -295,7 +295,7 @@ async def update(
             merge(self, fields)
 
             # prepare data for ES
-            values = self.to_dict()
+            values = self.to_dict(skip_empty=False)
 
             # if fields were given: partial update
             body["doc"] = {k: values.get(k) for k in fields.keys()}

elasticsearch_dsl/_sync/document.py

@@ -293,7 +293,7 @@ def update(
             merge(self, fields)
 
             # prepare data for ES
-            values = self.to_dict()
+            values = self.to_dict(skip_empty=False)
 
             # if fields were given: partial update
             body["doc"] = {k: values.get(k) for k in fields.keys()}

tests/test_integration/_async/test_document.py

@@ -120,6 +120,13 @@ class Index:
         name = "test-serialization"
 
 
+class Tags(AsyncDocument):
+    tags = Keyword(multi=True)
+
+    class Index:
+        name = "tags"
+
+
 @pytest.mark.asyncio
 async def test_serialization(async_write_client):
     await SerializationDoc.init()
@@ -504,6 +511,19 @@ async def test_save_updates_existing_doc(async_data_client):
     assert new_repo["_seq_no"] == elasticsearch_repo.meta.seq_no
 
 
+@pytest.mark.asyncio
+async def test_update_empty_field(async_client):
+    await Tags._index.delete(ignore_unavailable=True)
+    await Tags.init()
+    d = Tags(id="123", tags=["a", "b"])
+    await d.save(refresh=True)
+    await d.update(tags=[], refresh=True)
+    assert d.tags == []
+
+    r = await Tags.search().execute()
+    assert r.hits[0].tags == []
+
+
 @pytest.mark.asyncio
 async def test_save_automatically_uses_seq_no_and_primary_term(async_data_client):
     elasticsearch_repo = await Repository.get("elasticsearch-dsl-py")

tests/test_integration/_sync/test_document.py

@@ -120,6 +120,13 @@ class Index:
         name = "test-serialization"
 
 
+class Tags(Document):
+    tags = Keyword(multi=True)
+
+    class Index:
+        name = "tags"
+
+
 @pytest.mark.sync
 def test_serialization(write_client):
     SerializationDoc.init()
@@ -498,6 +505,19 @@ def test_save_updates_existing_doc(data_client):
     assert new_repo["_seq_no"] == elasticsearch_repo.meta.seq_no
 
 
+@pytest.mark.sync
+def test_update_empty_field(client):
+    Tags._index.delete(ignore_unavailable=True)
+    Tags.init()
+    d = Tags(id="123", tags=["a", "b"])
+    d.save(refresh=True)
+    d.update(tags=[], refresh=True)
+    assert d.tags == []
+
+    r = Tags.search().execute()
+    assert r.hits[0].tags == []
+
+
 @pytest.mark.sync
 def test_save_automatically_uses_seq_no_and_primary_term(data_client):
     elasticsearch_repo = Repository.get("elasticsearch-dsl-py")