UE 4.18 ENUM values as integeres no longer imported from JSON

Development Programming & Scripting
1

For example say we have a JSON file:

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

And a C++ Enum

UENUM(BlueprintType)
enum class EMyNiceEnum: uint8
{
	Unknown = 0x0,
	VeryNiceValue= 0x1,
	NiceValue= 0x2,
	NotSoNiceValue= 0x4
};

And a struct for dataasset:

USTRUCT(BlueprintType)
struct SOMEPROJECT_API FMyNiceData : public FTableRowBase
{
	GENERATED_USTRUCT_BODY()
public:
	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.

2

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.

3

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

4

Thanks a lot, for a quick fix.