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IndrajithPa1
Level 2
September 26, 2024
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Graphql Request for IDFilter gives coered Null Value Exception

  • September 26, 2024
  • 3 replies
  • 1202 views

I have a graphql query which takes IDFilter! as parameter and this works fine in the graphql editor and when i try to request from postman i am getting 

"Variable 'paths' has an invalid value: Variable 'paths' has coerced Null value for NonNull type 'IDFilter!'"
exception.
 
My Graphql Query

query ($expression:IDFilter!) {
internetList(
filter: {
_path: $expression
}
) {
items {
_path
}
}
}

Graphql Variables
{
   "expression":{
      "_logOp":"OR",
      "_expressions":[
         {
             "_operator": "EQUALS",
            "value":"/content/dam/sample/content-fragments/internet/internet1"
         },
         {
            "_operator": "EQUALS",
            "value":"/content/dam/sample/content-fragments/internet/internet2"
         }
      ]
   }
}


 


 




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    Best answer by lavishvasuja

    Hi @IndrajithPa ,

     

    Here are a few points you can check:


    Variable Naming: Ensure the variable name in your GraphQL query (e.g., $expression) matches exactly with the name used in your Postman variables object.

    JSON Structure: The request body in Postman should follow the correct format, including both "query" and "variables" keys, with properly structured JSON.

    Headers: Make sure the Content-Type header is set to application/json.

    Debugging Tip: If the query works in the AEM GraphQL editor but fails in Postman, it’s most likely due to incorrect payload formatting or mismatched variable names.

     

    Regards,

    Lavish Vasuja

    3 replies

    kautuk_sahni
    Community Manager
    kautuk_sahniCommunity Manager
    Community Manager
    February 3, 2025

    @narendragandhi@rohan_garg@abhishekanand_@dipti_chauhan@mahedi_sabuj@pulkitvashisth@pulkitvashisth@rahulmohan@anasustic@muskaanchandwani

    Kindly take a moment to review this question and share your valuable insights. Your expertise would be greatly appreciated!

    Kautuk Sahni
      AmitVishwakarma
      Community Advisor
      AmitVishwakarmaCommunity Advisor
      Community Advisor
      April 30, 2025

      Hi @indrajithpa1 ,

      The error you’re facing:

      Variable 'expression' has coerced Null value for NonNull type 'IDFilter!'

      means that the shape of your expression variable doesn’t match what the IDFilter! type expects. This is very common when calling GraphQL from Postman or other HTTP clients outside the AEM GraphiQL UI.

      Based on your query and error, here’s the corrected format you should use for your GraphQL Variables in Postman: GraphQL Query

      query ($expression: IDFilter!) { internetList(filter: { _path: $expression }) { items { _path } } }

      Or, if you're trying to apply multiple OR filters, then that likely uses a LogicalExpression wrapper. But only if the schema supports it!

      What You Must Check

      Open your AEM GraphQL schema in the GraphiQL tool.

      Check if the input for _path uses:

      IDFilter! (single object), or

      LogicalExpression! (for _logOp and _expressions).


      If Schema Supports OR Filter with LogicalExpression

      Then your query must change to:

      Query:

      query ($expression: LogicalExpression!) { internetList(filter: { _path: $expression }) { items { _path } } }

      Variables:

      { "expression": { "_logOp": "OR", "_expressions": [ { "_operator": "EQUALS", "value": "/content/dam/sample/content-fragments/internet/internet1" }, { "_operator": "EQUALS", "value": "/content/dam/sample/content-fragments/internet/internet2" } ] } }

      Note: Use LogicalExpression! as the variable type if _logOp is being used. IDFilter! cannot accept a LogicalExpression structure — that’s why you're getting the coercion error.

      Regards,
      Amit

      lavishvasuja
      lavishvasujaAccepted solution
      Level 3
      May 2, 2025

      Hi @IndrajithPa ,

       

      Here are a few points you can check:


      Variable Naming: Ensure the variable name in your GraphQL query (e.g., $expression) matches exactly with the name used in your Postman variables object.

      JSON Structure: The request body in Postman should follow the correct format, including both "query" and "variables" keys, with properly structured JSON.

      Headers: Make sure the Content-Type header is set to application/json.

      Debugging Tip: If the query works in the AEM GraphQL editor but fails in Postman, it’s most likely due to incorrect payload formatting or mismatched variable names.

       

      Regards,

      Lavish Vasuja

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