"""empty message
Revision ID: 3b2efd6da478
Revises: 6f456354bea1
Create Date: 2018-06-21 23:00:53.266721
"""
from alembic import op
import sqlalchemy as sa
# revision identifiers, used by Alembic.
revision = '3b2efd6da478'
down_revision = '6f456354bea1'
branch_labels = None
depends_on = None
def upgrade():
# ### commands auto generated by Alembic - please adjust! ###
op.add_column('task_result', sa.Column('parent_id', sa.Integer(), nullable=True))
op.create_index(op.f('ix_task_result_parent_id'), 'task_result', ['parent_id'], unique=False)
op.create_foreign_key(None, 'task_result', 'task_result', ['parent_id'], ['id'])
# ### end Alembic commands ###
def downgrade():
# ### commands auto generated by Alembic - please adjust! ###
op.drop_constraint(None, 'task_result', type_='foreignkey')
op.drop_index(op.f('ix_task_result_parent_id'), table_name='task_result')
op.drop_column('task_result', 'parent_id')
# ### end Alembic commands ###
