"""make updated field nullable

Revision ID: eaa992d1469b
Revises: 
Create Date: 2020-07-04 18:08:31.035209

"""
from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision = "eaa992d1469b"
down_revision = None
branch_labels = None
depends_on = None


def upgrade():
    tables = {
        "modified": "cities",
        "modified": "games",
        "cancel_date": "games",
        "modified": "payments",
        "modified": "player_availabilities",
        "modified": "player_cancel_games",
        "modified": "purchase_games",
        "modified": "sports",
        "modified": "teams",
        "modified": "user_ratings",
        "modified": "venues",
        "updated": "venue_images",
        "updated": "web_bookings",
    }
    for field, table in tables.items():
        with op.batch_alter_table(table) as batch_op:
            batch_op.alter_column(column_name=field, nullable=True)
        query = "UPDATE {0} SET {1} = NULL WHERE {1} = '0000-00-00 00:00:00'".format(
            table, field
        )
        op.execute(query)


def downgrade():
    pass