46 lines
1.2 KiB
Python
46 lines
1.2 KiB
Python
"""add slug
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Revision ID: 29ccbe077c57
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Revises: 55013fe95bea
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Create Date: 2022-05-20 19:46:11.924218
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"""
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# revision identifiers, used by Alembic.
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revision = '29ccbe077c57'
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down_revision = '55013fe95bea'
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from alembic import op
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import sqlalchemy as sa
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from sqlalchemy.sql import text
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def upgrade():
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op.add_column('order', sa.Column(
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'slug',
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sa.String(length=7),
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nullable=False,
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# Default: random alphanumerical string
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server_default=text('SUBSTRING(MD5(RAND()) FROM 1 FOR 7)')
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))
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op.create_unique_constraint('order_slug_unique', 'order', ['slug'])
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# Trigger to handle duplicates: generate new slug if slug already exists
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op.execute(text(
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"""
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CREATE TRIGGER order_before_insert
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BEFORE UPDATE ON `order`
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FOR EACH ROW
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BEGIN
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WHILE (NEW.slug IS NULL OR (SELECT id FROM `order` WHERE slug = NEW.slug) IS NOT NULL) DO
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SET NEW.slug = SUBSTRING(MD5(RAND()) FROM 1 FOR 7);
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END WHILE;
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END
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"""
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))
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def downgrade():
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op.execute(text("DROP TRIGGER order_before_insert"))
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op.drop_constraint('order_slug_unique', 'order', type_='unique')
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op.drop_column('order', 'slug')
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