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Data action with empty/null input contract field

  • 1.  Data action with empty/null input contract field

    Posted 06-05-2025 18:17

    Jeremy_MONZO | 2020-07-20 13:47:15 UTC | #1

    Hello,

    I would like create a data action with an input contract which accepts null value. My use case is the following : if the value is filled it gives a result if not , a result is given with a defaut value

    In my example, I have made test with the input contract tAcw. When I configued with no value, I get this error :

    8. Execute: The request could not be understood by the server due to malformed syntax.

    • REST call for action execute failed. Message:Request to backend service failed. Response from web service: {"message":"Must populate at least one of the parameters [gt, gte, lt, lte]","code":"bad.request","status":400,"messageParams":{},"contextId":"1240ab46-0190-4225-ad1a-3ce2716a6237","details":[],"errors":[]} [ad5abbb0-c1fc-48fe-920c-6c345b916328]

    I have configured the request body template with this code for the tAcw which should accept "null" value { "type": "metric", "metric": "tAcw", "range": { "lte": "#if( ${input.tAcw} )${input.tAcw}#else ${input.tAcw}=10#end" } }

    I have attached the export action for more details

    Many thanks for your hints jeremy

    Jeremy_MONZO | 2020-07-20 13:48:22 UTC | #2

    POST-TEST-NULL-value-20200720154152.custom.json|attachment (4.0 KB)

    Jerome.Saint-Marc | 2020-07-20 14:58:34 UTC | #3

    Hello,

    There might be other ways to do this. But I tried the following (Request Configuration - text below is when using Simple definition) and it seems to work.

    "lte": "#set( $mydefault = "10" )#if( ${input.tAcw} )${input.tAcw}#else$mydefault#end"

    Regards,

    Jeremy_MONZO | 2020-07-20 15:24:46 UTC | #4

    Hi Jerome,

    thanks for your help I have replaced by your suggestion int the Request Body Template, but now I get this error :

    2. Validate draft definition: The request could not be understood by the server due to malformed syntax.

    • Action POST TEST NULL value failed validation. Errors: [Template validation failed for 'config.request.requestTemplate'. Details: Encountered "mydefault" at validate config.request.requestTemplate[line 55, column 20] Was expecting one of: <IDENTIFIER> ... "{" ... ]

    It seems there is a problem with the variable mydefault, do you have made modification from my data Action sent?

    thanks jeremy

    Jerome.Saint-Marc | 2020-07-20 15:36:27 UTC | #5

    Sorry, the \$ sign got removed when I did the cut&paste from my data action to the forum (forgot to escape the $ to keep it displayed).

    "lte": "#set( \$mydefault = "10" )#if( \${input.tAcw} )\${input.tAcw}#else\$mydefault#end"

    Jeremy_MONZO | 2020-07-20 15:56:56 UTC | #6

    Many thanks it works! Jerome, you talked me about other ways for achieve this request, you can told me a little more? thanks again!

    Jerome.Saint-Marc | 2020-07-20 16:06:59 UTC | #7

    I meant that there might be other ways that I don't know. :slight_smile: First time I tried a velocity if/else to replace a null value.

    I did try (unsuccessful) to put the value directly after the else (without going through the mydefault variable). I could make it work when the value was string with a to z characters. But it didn't work with the integer value. So instead of trying to figure out if this could be done that way, I preferred to use the variable and #set (which worked).

    Jeremy_MONZO | 2020-07-20 16:18:35 UTC | #8

    From my side, tested many things without success :wink: thanks :+1:

    system | 2020-08-20 16:18:36 UTC | #9

    This topic was automatically closed 31 days after the last reply. New replies are no longer allowed.

    This post was migrated from the old Developer Forum.

    ref: 8336



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