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UE 4.18 ENUM values as integeres no longer imported from JSON

For example say we have a JSON file:

     "enumValue" : 1,
     "Name" : "2"
   }, {
     "enumValue" : 2,
     "Name" : "3"
   }, {
     "enumValue" : 4,
     "Name" : "4",

And a C++ Enum

 enum class EMyNiceEnum: uint8
     Unknown = 0x0,
     VeryNiceValue= 0x1,
     NiceValue= 0x2,
     NotSoNiceValue= 0x4

And a struct for dataasset:

 struct SOMEPROJECT_API FMyNiceData : public FTableRowBase
     UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = PlayerClasses)
     EMyNiceEnum EnumValue;

In UE4.17 importing that json worked fine. In UE4.18 during import we're getting warnings like: LogEnum: Warning: In asset 'None', there is an enum property of type 'EMyNiceEnum' with an invalid value of '1.0' , and all values in imported asset are "Unknown".

If we change values from numbers to strings like "enumValue" : "NiceValue", everything works fine, but we rely heavily on being able to import enums by values as it was in UE4.17 and backwards.

Please provide a fix, or enlight us on how to import enums by numbers with 4.18, as current situation rises a high disturbance of the Force in our heads.

Thank you.

Product Version: UE 4.18
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asked Nov 01 '17 at 12:55 PM in Bug Reports

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This looks like it was caused by a change to enum importing behaviour, which prevents it being able to import the stringified numeric values from the JSON (which are converted as a float). I've raised UE-51848 to track this.

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answered Nov 01 '17 at 02:31 PM

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Jamie Dale STAFF
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avatar image Jamie Dale STAFF Nov 03 '17 at 12:57 PM

This has been fixed for 4.18.1 (see this change).

avatar image dldls Nov 03 '17 at 04:38 PM

Thanks a lot, for a quick fix.

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