graceguo-supercat commented on a change in pull request #9109: [migration] 
metadata for dashboard filters
URL: 
https://github.com/apache/incubator-superset/pull/9109#discussion_r377959082
 
 

 ##########
 File path: 
superset/migrations/versions/3325d4caccc8_dashboard_scoped_filters.py
 ##########
 @@ -0,0 +1,114 @@
+# 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.
+"""empty message
+
+Revision ID: 3325d4caccc8
+Revises: e96dbf2cfef0
+Create Date: 2020-02-07 14:13:51.714678
+
+"""
+
+# revision identifiers, used by Alembic.
+import json
+import logging
+
+from alembic import op
+from sqlalchemy import and_, Column, ForeignKey, Integer, String, Table, Text
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import relationship
+
+from superset import db
+from superset.utils.dashboard_filter_scopes_converter import 
convert_filter_scopes
+
+revision = "3325d4caccc8"
+down_revision = "e96dbf2cfef0"
+
+Base = declarative_base()
+
+
+class Slice(Base):
+    """Declarative class to do query in upgrade"""
+
+    __tablename__ = "slices"
+    id = Column(Integer, primary_key=True)
+    slice_name = Column(String(250))
+    params = Column(Text)
+    viz_type = Column(String(250))
+
+
+dashboard_slices = Table(
+    "dashboard_slices",
+    Base.metadata,
+    Column("id", Integer, primary_key=True),
+    Column("dashboard_id", Integer, ForeignKey("dashboards.id")),
+    Column("slice_id", Integer, ForeignKey("slices.id")),
+)
+
+
+class Dashboard(Base):
+    __tablename__ = "dashboards"
+    id = Column(Integer, primary_key=True)
+    json_metadata = Column(Text)
+    slices = relationship("Slice", secondary=dashboard_slices, 
backref="dashboards")
+
+
+def upgrade():
+    bind = op.get_bind()
+    session = db.Session(bind=bind)
+
+    dashboards = session.query(Dashboard).all()
+    for i, dashboard in enumerate(dashboards):
+        print("scanning dashboard ({}/{}) >>>>".format(i + 1, len(dashboards)))
 
 Review comment:
   in my test, scanning 11000 records takes ~4 minutes. 
   this `print` some progress in the console so that during deployment we can 
see how much work is done. Otherwise it will look like db upgrade is hanging 
there.
   the logging.info is used to save a record (can't see it from console).

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