"""Add the updated_on column to pull-requests

Revision ID: 6190226bed0

Revises: 257a7ce22682

Create Date: 2015-09-29 15:32:58.229183

"""

# revision identifiers, used by Alembic.

revision = '6190226bed0'

down_revision = '257a7ce22682'

from alembic import op

import sqlalchemy as sa

def upgrade():

    ''' Add the column updated_on to the table pull_requests.

    '''

    op.add_column(

        'pull_requests',

        sa.Column(

            'updated_on',

            sa.DateTime,

            nullable=True,

            default=sa.func.now(),

            onupdate=sa.func.now()

        )

    )

    op.execute('''UPDATE "pull_requests" SET updated_on=date_created;''')

    op.alter_column(

        'pull_requests',

        column_name='updated_on',

        nullable=False,

        existing_nullable=True)

def downgrade():

    ''' Remove the column updated_on from the table pull_requests.

    '''

    op.drop_column('pull_requests', 'updated_on')