superset/migrations/versions/33d996bcc382_update_slice_model.py

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"""update slice model

Revision ID: 33d996bcc382
Revises: 41f6a59a61f2
Create Date: 2016-09-07 23:50:59.366779

"""
import sqlalchemy as sa
from alembic import op
from sqlalchemy import Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base

from superset import db

# revision identifiers, used by Alembic.
revision = "33d996bcc382"
down_revision = "41f6a59a61f2"

Base = declarative_base()


class Slice(Base):
    """Declarative class to do query in upgrade"""

    __tablename__ = "slices"
    id = Column(Integer, primary_key=True)
    datasource_id = Column(Integer)
    druid_datasource_id = Column(Integer)
    table_id = Column(Integer)
    datasource_type = Column(String(200))


def upgrade():
    bind = op.get_bind()
    op.add_column("slices", sa.Column("datasource_id", sa.Integer()))
    session = db.Session(bind=bind)

    for slc in session.query(Slice).all():
        if slc.druid_datasource_id:
            slc.datasource_id = slc.druid_datasource_id
        if slc.table_id:
            slc.datasource_id = slc.table_id
        session.merge(slc)
        session.commit()
    session.close()


def downgrade():
    bind = op.get_bind()
    session = db.Session(bind=bind)
    for slc in session.query(Slice).all():
        if slc.datasource_type == "druid":
            slc.druid_datasource_id = slc.datasource_id
        if slc.datasource_type == "table":
            slc.table_id = slc.datasource_id
        session.merge(slc)
        session.commit()
    session.close()
    op.drop_column("slices", "datasource_id")