"""make username unique

Revision ID: 135ba3ff136a
Revises: 5de5fdfbe69a
Create Date: 2021-03-05 18:07:36.955364

"""
from alembic import op
import sqlalchemy as sa
import sqlalchemy_utc
from sqlalchemy.dialects import mysql

# revision identifiers, used by Alembic.
revision = '135ba3ff136a'
down_revision = '5de5fdfbe69a'
branch_labels = None
depends_on = None


def upgrade():
    # ### commands auto generated by Alembic - please adjust! ###
    op.alter_column('episode', 'episode_number',
               existing_type=mysql.INTEGER(),
               nullable=True)
    op.alter_column('episode', 'release_date',
               existing_type=mysql.VARCHAR(collation='utf8mb4_unicode_ci', length=256),
               nullable=True)
    op.create_unique_constraint(None, 'user', ['username'])
    # ### end Alembic commands ###


def downgrade():
    # ### commands auto generated by Alembic - please adjust! ###
    op.drop_constraint(None, 'user', type_='unique')
    op.alter_column('episode', 'release_date',
               existing_type=mysql.VARCHAR(collation='utf8mb4_unicode_ci', length=256),
               nullable=False)
    op.alter_column('episode', 'episode_number',
               existing_type=mysql.INTEGER(),
               nullable=False)
    # ### end Alembic commands ###