fix: migrate all slices off the old time grain format

superset/migrations/versions/620241d1153f_update_time_grain_sqla.py

@@ -0,0 +1,107 @@
+# 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.
+"""update time_grain_sqla
+
+Revision ID: 620241d1153f
+Revises: f9a30386bd74
+Create Date: 2020-04-29 09:24:04.952368
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = "620241d1153f"
+down_revision = "f9a30386bd74"
+
+import json
+
+from alembic import op
+from sqlalchemy import Column, ForeignKey, Integer, Text
+from sqlalchemy.engine.url import make_url
+from sqlalchemy.ext.declarative import declarative_base
+
+from superset import db, db_engine_specs
+from superset.utils import core as utils
+
+Base = declarative_base()
+
+
+class Database(Base):
+    __tablename__ = "dbs"
+
+    id = Column(Integer, primary_key=True)
+    sqlalchemy_uri = Column(Text)
+
+    def grains(self):
+        url = make_url(self.sqlalchemy_uri)
+        backend = url.get_backend_name()
+        db_engine_spec = db_engine_specs.engines.get(
+            backend, db_engine_specs.BaseEngineSpec
+        )
+        return db_engine_spec.get_time_grains()
+
+
+class Table(Base):
+    __tablename__ = "tables"
+
+    id = Column(Integer, primary_key=True)
+    database_id = Column(Integer, ForeignKey("dbs.id"))
+
+
+class Slice(Base):
+    __tablename__ = "slices"
+
+    id = Column(Integer, primary_key=True)
+    params = Column(Text)
+    datasource_type = Column(Text)
+    datasource_id = Column(Integer)
+
+
+@utils.memoized
+def duration_by_name(database: Database):
+    return {grain.name: grain.duration for grain in database.grains()}
+
+
+def upgrade():
+    bind = op.get_bind()
+    session = db.Session(bind=bind)
+
+    query = (
+        session.query(Slice, Database)
+        .filter(Slice.datasource_type == "table")
+        .filter(Slice.datasource_id == Table.id)
+        .filter(Table.database_id == Database.id)
+        .all()
+    )
+
+    for slc, database in query:
+        try:
+            params = json.loads(slc.params)
+            duration_dict = duration_by_name(database)
+            granularity = params.get("time_grain_sqla")
+            if granularity in duration_dict:
+                params["time_grain_sqla"] = duration_dict[granularity]
+                slc.params = json.dumps(params, sort_keys=True)
+        except Exception:
+            pass
+
+    session.commit()
+    session.close()
+
+
+# No downgrade because we can't know what rows were changed in the previous upgrade
+def downgrade():
+    pass