[WC-3417] Fix string empty/not-empty filters#2236
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Because strings can be in two different states, one is `empty`, other is "". Previously, before 11.6, empty() was matching both, now, because "of new string behavior", empty strings have to be matched explicitly.
iobuhov
requested changes
May 29, 2026
iobuhov
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May 29, 2026
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Summary
Fixed an issue where "is empty" and "is not empty" string filters were not working correctly in some cases.
The root cause was that string attributes can be in two different states:
emptyor""(empty string). Previously, theempty()filter matched both states, but due to new string behavior in recent Mendix versions, empty strings must now be matched explicitly.Changes
BaseInputFilterStore.getFilterCondition()to generate compound filter expressions for string attributes:attr = empty OR attr = ""attr != empty AND attr != ""isEmptyStringExp()andisNotEmptyStringExp()to recognize these compound expressionsinputStateFromCond()to restore filter state from compound expressionsTest plan