Expression results are stringified

[FHourmy]

Are you requesting a feature, reporting a bug or asking a question?

Bug
This behavior is introduced by the version 1.9.108

What is the current behavior?

the result of an expression which is a complex type is stringified.

What is the expected behavior?

the result of an expression if it is a complex type should not be stringified

How would you reproduce the current behavior (if this is a bug)?

sandbox : https://codesandbox.io/s/fervent-feynman-syklql
you can see in the log data when you change the text question value that the value of the question testExpression is a stringified array instead of

Specify your

• browser: chrome
• surveyjs platform (angular or react or jquery or knockout or vue): jquery
• surveyjs version: 1.9.108

[JaneSjs]

Hello @FHourmy,
Thank you for sharing a demo. I tested your sample and confirmed that this behavior exists in an older version of a SurveyJS Form Library (for instance, 1.9.90). Would you please elaborate on the expected behavior?
For now, you can programmatically convert an array of values into a required representation.

Consider the updated demo: https://codesandbox.io/s/focused-poincare-w6p6zt?file=/index.js:43-218.

Survey.FunctionFactory.Instance.register("testExpression", () => {
  const values = [{ value: "t1" }, { value: "t2" }];
  const res = JSON.stringify(values);
  return res;
});

Thanks

[FHourmy]

Hello @JaneSjs
The problem is the type of stored value. you can see it in the console

in version 1.9.108 the current behavior

The returned value is stored as a string [object,object

repro on https://codesandbox.io/s/fervent-feynman-syklql?file=/index.js

in older version the expected behavior (for instance 1.9.90)

The returned value is stored in the same way it is returned, conserving its type

repro on https://codesandbox.io/s/festive-lewin-kv82v3?file=/index.html

In your edit

You stringify the array to store it, losing its type and potential complex properties (can't store functions this way for exemple)

repro on https://codesandbox.io/s/focused-poincare-w6p6zt?file=/index.js

Thank you for your time :)

[andrewtelnov]

@FHourmy The issue was introduced by fixing this issue.
I have changed the fix. In fact, it was fixed incorrectly. I should not change the expression question model code.
I wrote the correct unit tests for that fix and added unit test for your case in the PR above.

Thank you,
Andrew