"""set modified/updated as nullable

Revision ID: 970563653ece
Revises: 
Create Date: 2020-07-22 23:40:07.674252

"""
from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision = "970563653ece"
down_revision = None
branch_labels = None
depends_on = None


def upgrade():
    tables = {
        "cities": "updated",
        "games": "updated",
        "payments": "updated",
        "player_availabilities": "updated",
        "player_cancel_games": "updated",
        "purchase_games": "updated",
        "sports": "updated",
        "teams": "updated",
        "user_ratings": "updated",
        "venues": "updated",
        "venue_images": "updated",
        "web_bookings": "updated",
    }
    for table, field in tables.items():
        with op.batch_alter_table(table) as batch_op:
            batch_op.alter_column(column_name=field, nullable=True, server_default=None)
        query = "UPDATE {0} SET {1} = NULL WHERE {1} = '0000-00-00 00:00:00'".format(
            table, field
        )
        op.execute(query)


def downgrade():
    pass