[4.x]: Date field condition ':notempty:' throws error

[nilsenpaul]

What happened?

Description

In a custom element source, with the condition of a date field set to 'empty' or 'not empty', an error gets thrown:

craft\fields\conditions\DateFieldConditionRule::elementQueryParam(): Return value must be of type ?array, string returned

Steps to reproduce

1. Create a custom element source on an element with a date field
2. Set a condition 'not empty' or 'empty' on the date field
3. Try to load the element index. It doesn't work (for me)

elementQueryParam must return null or an array, but it gets its input from BaseDateRangeConditionRule, which returns a string if 'empty' or 'not empty' was requested.

Craft CMS version

4.3.4

PHP version

8.1

Operating system and version

No response

Database type and version

No response

Image driver and version

No response

Installed plugins and versions

No response

[i-just]

Thanks for reporting! I created a PR to fix this.

[brandonkelly]

This is fixed for the next release via #12461.

[brandonkelly]

Craft 4.3.6 is out with the fix for this.