Fix for execute write returning issue #2762

tests/test_internals_database.py

@@ -469,13 +469,116 @@ async def test_view_names(db):
 
 @pytest.mark.asyncio
 async def test_execute_write_block_true(db):
-    await db.execute_write(
+    result = await db.execute_write(
         "update roadside_attractions set name = ? where pk = ?", ["Mystery!", 1]
     )
     rows = await db.execute("select name from roadside_attractions where pk = 1")
+    assert result.rowcount == 1
+    assert result.description is None
+    assert result.truncated is False
+    assert result.fetchall() == []
     assert "Mystery!" == rows.rows[0][0]
 
 
+@pytest.mark.asyncio
+async def test_execute_write_with_returning(db):
+    await db.execute_write(
+        "create table write_returning (id integer primary key, name text)"
+    )
+    result = await db.execute_write(
+        "insert into write_returning (name) values (?) returning id, name",
+        ["Cleo"],
+    )
+
+    assert result.rowcount == 1
+    assert result.lastrowid == 1
+    assert [column[0] for column in result.description] == ["id", "name"]
+    assert result.truncated is False
+    assert [dict(row) for row in result.fetchall()] == [{"id": 1, "name": "Cleo"}]
+    assert result.fetchall() == []
+    assert (await db.execute("select id, name from write_returning")).dicts() == [
+        {"id": 1, "name": "Cleo"}
+    ]
+
+
+@pytest.mark.asyncio
+async def test_execute_write_with_returning_default_limit(db):
+    await db.execute_write(
+        "create table write_returning_limit (id integer primary key)"
+    )
+    await db.execute_write_many(
+        "insert into write_returning_limit (id) values (?)",
+        [(i,) for i in range(1, 21)],
+    )
+
+    result = await db.execute_write(
+        "update write_returning_limit set id = id returning id"
+    )
+
+    assert result.rowcount == -1
+    assert result.truncated is True
+    assert len(result.fetchall()) == 10
+    assert (
+        await db.execute("select count(*) from write_returning_limit")
+    ).single_value() == 20
+
+
+@pytest.mark.asyncio
+async def test_execute_write_with_returning_exact_default_limit(db):
+    await db.execute_write(
+        "create table write_returning_exact_limit (id integer primary key)"
+    )
+    await db.execute_write_many(
+        "insert into write_returning_exact_limit (id) values (?)",
+        [(i,) for i in range(1, 11)],
+    )
+
+    result = await db.execute_write(
+        "update write_returning_exact_limit set id = id returning id"
+    )
+
+    assert result.rowcount == 10
+    assert result.truncated is False
+    assert len(result.fetchall()) == 10
+
+
+@pytest.mark.asyncio
+async def test_execute_write_with_returning_one_more_than_default_limit(db):
+    await db.execute_write(
+        "create table write_returning_one_more (id integer primary key)"
+    )
+    await db.execute_write_many(
+        "insert into write_returning_one_more (id) values (?)",
+        [(i,) for i in range(1, 12)],
+    )
+
+    result = await db.execute_write(
+        "update write_returning_one_more set id = id returning id"
+    )
+
+    assert result.rowcount == 11
+    assert result.truncated is True
+    assert len(result.fetchall()) == 10
+
+
+@pytest.mark.asyncio
+async def test_execute_write_with_returning_return_all(db):
+    await db.execute_write("create table write_returning_all (id integer primary key)")
+    await db.execute_write_many(
+        "insert into write_returning_all (id) values (?)",
+        [(i,) for i in range(1, 21)],
+    )
+
+    result = await db.execute_write(
+        "update write_returning_all set id = id returning id",
+        return_all=True,
+    )
+
+    assert result.rowcount == 20
+    assert result.truncated is False
+    assert [row["id"] for row in result.fetchall()] == list(range(1, 21))
+
+
 @pytest.mark.asyncio
 async def test_execute_write_block_false(db):
     await db.execute_write(
@@ -487,6 +590,24 @@ async def test_execute_write_block_false(db):
     assert "Mystery!" == rows.rows[0][0]
 
 
+@pytest.mark.asyncio
+async def test_execute_write_with_returning_block_false(db):
+    await db.execute_write(
+        "create table write_returning_block_false (id integer primary key, name text)"
+    )
+    task_id = await db.execute_write(
+        "insert into write_returning_block_false (name) values (?) returning id",
+        ["Cleo"],
+        block=False,
+    )
+
+    assert isinstance(task_id, uuid.UUID)
+    time.sleep(0.1)
+    assert (
+        await db.execute("select name from write_returning_block_false")
+    ).single_value() == "Cleo"
+
+
 @pytest.mark.asyncio
 async def test_execute_write_script(db):
     await db.execute_write_script(

tests/test_queries.py

@@ -3002,3 +3002,32 @@ async def test_user_writable_query_execution_rechecks_table_permissions():
     assert denied_response.status_code == 403
     rows = (await db.execute("select name from dogs")).dicts()
     assert rows == [{"name": "Cleo"}]
+
+
+@pytest.mark.asyncio
+async def test_stored_write_query_with_returning():
+    ds = Datasette(memory=True, default_deny=True)
+    ds.root_enabled = True
+    db = ds.add_memory_database("query_write_returning", name="data")
+    await db.execute_write("create table dogs (id integer primary key, name text)")
+    await ds.invoke_startup()
+    await ds.add_query(
+        "data",
+        "insert_dog",
+        "insert into dogs (name) values (:name) returning id, name",
+        is_write=True,
+        source="user",
+        owner_id="root",
+    )
+
+    response = await ds.client.post(
+        "/data/insert_dog?_json=1",
+        actor={"id": "root"},
+        data={"name": "Cleo"},
+    )
+
+    assert response.status_code == 200
+    assert response.json()["ok"] is True
+    assert (await db.execute("select id, name from dogs")).dicts() == [
+        {"id": 1, "name": "Cleo"}
+    ]