Update value in the nested json

RE: Update value in the nested json

Stefan Helzle — Tue, 27 Sep 2022 12:20:12 GMT

Appian uses a functional approach. And there is no functional language which allows you to do that. Check out the docs: https://docs.appian.com/suite/help/22.3/Expressions.html#functions-and-side-effects

RE: Update value in the nested json

kevins1191 — Tue, 27 Sep 2022 12:16:57 GMT

Got it. Thanks! It is great help. But I still cannot understand why I cannot do the update in the forEach directly. Because it is common in other language to update something in the forEach

RE: Update value in the nested json

Stefan Helzle — Tue, 27 Sep 2022 12:09:20 GMT

Sure. You create the modified copy in local!result but then define the unmodified value as the output.

In case you need a JSON string as the output, call toJson() to do so.

RE: Update value in the nested json

kevins1191 — Tue, 27 Sep 2022 12:05:38 GMT

Thanks for your suggestion. But How can I do it? Currently I do it in the expression rule. The json, targetField and value are the parameter. I parse the json as a new object in the rule and I do the change on this new object.

RE: Update value in the nested json

Stefan Helzle — Tue, 27 Sep 2022 11:12:04 GMT

You cannot "change" a value in an expression in Appian. instead, you create a modified copy as the returned value.

RE: Update value in the nested json

kevins1191 — Tue, 27 Sep 2022 11:00:04 GMT

targetField is "CV Upload".Value is a string. You can set it anything

RE: Update value in the nested json

Harshit Bumb (Appyzie) — Tue, 27 Sep 2022 10:10:47 GMT

What are the values of targetField and value Rule Inputs?

RE: Update value in the nested json

kevins1191 — Tue, 27 Sep 2022 09:56:28 GMT

[
    {
        "customkey": "",
        "sectioninstructions": "",
        "sectionparent": "root",
        "questions": [
            {
                "customkey": "",
                "rowlabelstyle": "",
                "rowlabel": "CV Submission",
                "questionrow": [
                    {
                        "customkey": "",
                        "ismandatory": "",
                        "questiontooltip": "",
                        "questionid": 1,
                        "readonly": "",
                        "questioninstructions": "",
                        "questiontitle": "CV Upload",
                        "responsetype": "recordaction",
                        "responsevalue": "",
                        "responsetext": "",
                        "parentid": 1
                    }
                ]
            }
        ],
        "sectionlevel": 1,
        "nestedjson": "",
        "sectionstyle": "bold",
        "sectiontype": "card",
        "collapsible": true,
        "sectionname": "Questionnaire",
        "objectid": 1,
        "parentid": 0
    }
]

This is the json. I need to update the "responsevalue" for the item in the "questionrow"

RE: Update value in the nested json

Harshit Bumb (Appyzie) — Tue, 27 Sep 2022 09:50:53 GMT

Can you paste the JSON here as code for better debugging?

RE: Update value in the nested json

kevins1191 — Tue, 27 Sep 2022 09:21:51 GMT

In result variable it misses some fields. And the data struct is different.

The origin json

The result variable

RE: Update value in the nested json

Durgesh Kahar — Tue, 27 Sep 2022 09:18:40 GMT

Check your result variable value.