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Update migration for MySQL compliance

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This commit is contained in:
Raphael Michel
2021-03-30 10:04:09 +02:00
parent 2d4249ab31
commit 184a45b773
1 changed files with 13 additions and 8 deletions
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21
src/pretix/base/migrations/0179_auto_20210311_1653.py
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@@ -5,24 +5,29 @@ from django.db import migrations
def clean_duplicates(apps, schema_editor):
while True:
# Double subquery to avoid MySQL error 1093
delete_options = """
DELETE
FROM pretixbase_questionanswer_options
WHERE questionanswer_id IN (
SELECT MIN(qa.id)
FROM pretixbase_questionanswer qa
GROUP BY qa.cartposition_id, qa.orderposition_id, qa.question_id
HAVING COUNT(*) > 1
SELECT minid FROM (
SELECT MIN(qa.id) minid
FROM pretixbase_questionanswer qa
GROUP BY qa.cartposition_id, qa.orderposition_id, qa.question_id
HAVING COUNT(*) > 1
) AS tmptable
);
"""
delete_answers = """
DELETE
FROM pretixbase_questionanswer
WHERE pretixbase_questionanswer.id IN (
SELECT MIN(qa.id)
FROM pretixbase_questionanswer qa
GROUP BY qa.cartposition_id, qa.orderposition_id, qa.question_id
HAVING COUNT(*) > 1
SELECT minid FROM (
SELECT MIN(qa.id) minid
FROM pretixbase_questionanswer qa
GROUP BY qa.cartposition_id, qa.orderposition_id, qa.question_id
HAVING COUNT(*) > 1
) AS tmptable
);
"""
with schema_editor.connection.cursor() as cursor: