Tracking Issue: Fn::ToJsonString RFC
mluk-aws opened this issue · 5 comments
Description
Provide an intrinsic function that converts an input template block into an escaped JSON string.
Original Issue: #53
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Hi have cases say it is not working at the moment
EventPattern:
Fn::ToJsonString:
- test1: 'test2'
test3: 'test4'
Stack will fail at the Transform stage with error "Transform AWS::LanguageExtensions failed with: Fn::ToJsonString resolve value type mismatch. Rollback requested by user."
Hey @jiemying,
thanks for bringing this up.
To unblock you: EventPattern supports Json objects natively. There is no need to use Fn::ToJsonString for the EventPattern attribute.
Hey @jiemying, thanks for bringing this up.
To unblock you: EventPattern supports Json objects natively. There is no need to use Fn::ToJsonString for the EventPattern attribute.
Hi, thx for coming back to me so promptly!
Yep I am aware of that, that was for reference.
The error happens at the Transform stage of the CloudFormation stack operation, no matter where I put the above test Fn::ToJsonString in the template's resources properties, the stack transform stage failed with the same error.
I suspect the object "type" passed to this intrinsic function in the back-end, does not match wanted object type of the code, hence the exception error throws. Look at the exception part of the code may be helpful.
Hey @jiemying,
if this happens even when you put Fn::ToJsonString somewhere else (where a String is expected), I would appreciate if you could provide an example template. If you still have it handy, any chance you could open a new issue in this same repo?