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"""Migrate negative weights
Revision ID: a67119aa3ee5
Revises: afbf27e6ef20
Create Date: 2018-12-25 18:34:20.220844
"""
# revision identifiers, used by Alembic.
revision = "a67119aa3ee5"
down_revision = "afbf27e6ef20"
from alembic import op
import sqlalchemy as sa
# Snapshot of the person table
person_helper = sa.Table(
"person",
sa.MetaData(),
sa.Column("id", sa.Integer(), nullable=False),
sa.Column("project_id", sa.String(length=64), nullable=True),
sa.Column("name", sa.UnicodeText(), nullable=True),
sa.Column("activated", sa.Boolean(), nullable=True),
sa.Column("weight", sa.Float(), nullable=True),
sa.ForeignKeyConstraint(["project_id"], ["project.id"]),
sa.PrimaryKeyConstraint("id"),
)
def upgrade():
op.execute(
person_helper.update().where(person_helper.c.weight <= 0).values(weight=1)
)
def downgrade():
# Downgrade path is not possible, because information has been lost.
pass
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