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Deduplicate rows before notification associations unique constraint migration

This commit is contained in:
Marti Raudsepp 2018-12-21 12:06:52 +02:00
parent 0b39d0fa34
commit 0f2e30cdae
1 changed files with 8 additions and 0 deletions
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8
lemur/migrations/versions/449c3d5c7299_.py
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@ -21,6 +21,14 @@ COLUMNS = ["notification_id", "certificate_id"]
def upgrade(): def upgrade():
connection = op.get_bind()
# Delete duplicate entries
connection.execute("""\
DELETE FROM certificate_notification_associations WHERE ctid NOT IN (
-- Select the first tuple ID for each (notification_id, certificate_id) combination and keep that
SELECT min(ctid) FROM certificate_notification_associations GROUP BY notification_id, certificate_id
)
""")
op.create_unique_constraint(CONSTRAINT_NAME, TABLE, COLUMNS) op.create_unique_constraint(CONSTRAINT_NAME, TABLE, COLUMNS)