[GitHub] [superset] villebro commented on a change in pull request #15939: feat: viz migration script

[GitBox <gi...@apache.org>]

villebro commented on a change in pull request #15939:
URL: https://github.com/apache/superset/pull/15939#discussion_r680701635



##########
File path: superset/migrations/versions/9ed569cf4ba9_migrate_pivottable_from_v1_to_v2.py
##########
@@ -0,0 +1,101 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+"""Migrate pivottable from v1 to v2
+
+Revision ID: 9ed569cf4ba9
+Revises: ae1ed299413b
+Create Date: 2021-07-27 15:20:38.942341
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = "9ed569cf4ba9"
+down_revision = "ae1ed299413b"
+
+import os
+from pathlib import Path
+
+from alembic import op
+from sqlalchemy import Column, Integer, Text
+from sqlalchemy.exc import OperationalError
+from sqlalchemy.ext.declarative import declarative_base
+
+from superset import db
+from superset.config import DATA_DIR
+from superset.migrations.shared.migrate_viz import MigratePivotTable
+
+Base = declarative_base()
+
+
+class Slice(Base):
+    __tablename__ = "slices"
+
+    id = Column(Integer, primary_key=True)
+    slice_name = Column(Text)
+    viz_type = Column(Text)
+    params = Column(Text)
+    uuid = Column(Text)
+
+
+os.makedirs(os.path.join(DATA_DIR, "migrate_viz_pivottable"), exist_ok=True)
+
+
+def upgrade():
+    bind = op.get_bind()
+    session = db.Session(bind=bind)
+
+    try:
+        slices = session.query(Slice).filter(Slice.viz_type == "pivot_table")
+        total = slices.count()
+        idx = 0
+        for slc in slices.yield_per(100):
+            idx += 1
+            print(f"Upgrading ({idx}/{total}): {slc.slice_name}#{slc.id}")
+            with open(
+                os.path.join(
+                    DATA_DIR, "migrate_viz_pivottable", f"{str(slc.uuid)}.json"
+                ),
+                "w",
+                encoding="utf-8",
+            ) as f:
+                f.write(slc.params)

Review comment:
       Yes, I understand now 👍 I think skipping the downgrade in this case makes sense. Alternatively we could add a dummy field in the chart properties to indicate that it has been upgraded, after which it would be possible to downgrade the ones that had previously been upgraded. But I'd almost vote for just skipping the downgrade logic or accepting the fact that a downgrade will downgrade all v2 charts to v1.




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