Bug in mergeElements function (Elements service)

[tim-van-dijkhuizen]

Description

I'm trying to merge two elements but this query causes an error. The relations table doesn't even have an elementId column.

cms/src/services/Elements.php

Line 1085 in 939abd1

$db->createCommand()

Context:
https://i.postimg.cc/BQBnTG1j/discord-screenshot.png

Steps to reproduce

1. Try merging two elements using the mergeElements() function
2. DatabaseException

Additional info

I currently don't have access to the stacktrace but it should be obvious what is causing the error.

• Craft version: 3.3.16.3
• PHP version: 7.1.6
• Database driver & version: MySQL 5.5.59
• Plugins & versions: No plugins involved

[brandonkelly]

Thanks for posting the GitHub issue! Just fixed this for the next Craft 3.4 release.