1 files changed, 38 insertions, 0 deletions
diff --git a/ihatemoney/migrations/versions/a67119aa3ee5_migrate_negative_weights.py b/ihatemoney/migrations/versions/a67119aa3ee5_migrate_negative_weights.py
new file mode 100644
index 0000000..ec23470
--- /dev/null
+++ b/ihatemoney/migrations/versions/a67119aa3ee5_migrate_negative_weights.py
@@ -0,0 +1,38 @@
+"""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