"""Add merge status to the pull_requests table

Revision ID: b5efae6bb23

Revises: None

Create Date: 2015-06-02 16:30:06.199128

"""

# revision identifiers, used by Alembic.

revision = 'b5efae6bb23'

down_revision = None

from alembic import op

from sqlalchemy.dialects.postgresql import ENUM

import sqlalchemy as sa

# Sources for the code: https://bitbucket.org/zzzeek/alembic/issue/67

def upgrade():

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

    '''

    enum = ENUM('NO_CHANGE', 'FFORWARD', 'CONFLICTS', 'MERGE',

                name='merge_status_enum', create_type=False)

    enum.create(op.get_bind(), checkfirst=False)

    op.add_column(

        'pull_requests',

        sa.Column('merge_status', enum, nullable=True)

    )

def downgrade():

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

    '''

    ENUM(name="merge_status_enum").drop(op.get_bind(), checkfirst=False)

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