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"""Materializing permission

Revision ID: c3a8f8611885
Revises: 4fa88fe24e94
Create Date: 2016-04-25 08:54:04.303859

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

from superset import db

# revision identifiers, used by Alembic.
revision = 'c3a8f8611885'
down_revision = '4fa88fe24e94'


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))
    druid_datasource_id = Column(Integer, ForeignKey('datasources.id'))
    table_id = Column(Integer, ForeignKey('tables.id'))
    perm = Column(String(2000))


def upgrade():
    bind = op.get_bind()
    op.add_column('slices', sa.Column('perm', sa.String(length=2000), nullable=True))
    session = db.Session(bind=bind)

    # Use Slice class defined here instead of models.Slice
    for slc in session.query(Slice).all():
        if slc.datasource:
            slc.perm = slc.datasource.perm
            session.merge(slc)
            session.commit()
    db.session.close()


def downgrade():
    # Use batch_alter_table because dropping columns is not supported in SQLite
    with op.batch_alter_table('slices') as batch_op:
        batch_op.drop_column('perm')
