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fix/migration: fix entity_id column to be nullable #7

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Merged
rudyardrichter merged 1 commit into from
Feb 15, 2019
Merged

fix/migration: fix entity_id column to be nullable #7

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14 changes: 12 additions & 2 deletions datamodelutils/postgres_admin.py
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Original file line number Diff line number Diff line change
Expand Up @@ -162,14 +162,24 @@ def migrate_transaction_snapshots(driver):
tablename = models.submission.TransactionSnapshot.__tablename__
snapshots_table = Table(tablename, md, autoload=True)
if "entity_id" not in snapshots_table.c:
# change existing `id` column to `entity_id` which is just node UUID, doesn't
# have to be unique, should not be used as primary key
try:
execute(
driver,
"ALTER TABLE {name} DROP CONSTRAINT {name}_pkey;".format(name=tablename),
)
except sa.exc.ProgrammingError:
pass
execute(
driver,
"ALTER TABLE {name} DROP CONSTRAINT {name}_pkey".format(name=tablename),
"ALTER TABLE {} RENAME id TO entity_id;".format(tablename),
)
execute(
driver,
"ALTER TABLE {} RENAME id TO entity_id".format(tablename),
"ALTER TABLE {} ALTER COLUMN entity_id DROP NOT NULL;".format(tablename),
)
# make new serial `id` column which *is* used for primary key
execute(
driver,
"ALTER TABLE {} ADD COLUMN id SERIAL PRIMARY KEY;".format(tablename),
Expand Down