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ManyToMany relation - v3 workaround for ER_CANT_UPDATE_USED_TABLE_IN_SF_OR_TRG mysql error #11

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merged 2 commits into from
Aug 10, 2022

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#7, once again - with additional fix for objection v3 (previous merge was reverted by force-push to the commit before merge)

original description:

Workaround for ER_CANT_UPDATE_USED_TABLE_IN_SF_OR_TRG mysql error when a trigger on join table was operating on the related table

  • targeting mysql only
  • filters/modify on join table of m2m relations
  • if subquery is not needed at all (e.g. a query with just a findById(s) operation - usually coming from graph upsert) - skip it
  • otherwise extract a subquery reading related ids to separate query run before the delete query for m2m unrelate operation

This is an upgraded (to objection v3) version of:

Originally based on:

marcinlee and others added 2 commits August 10, 2022 10:30
…gger on join table was operating on the related table

- targeting mysql only
- filters/modify on join table of m2m relations #2
- if subquery is not needed at all (e.g. a query with just a findById(s) operation - usually coming from graph upsert) - skip it
- otherwise extract a subquery reading related ids to separate query run before the delete query for m2m unrelate operation

This is an upgraded (to objection v3) version of:
- #3
- #1
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2 participants