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Querying same field w/ and w/o attributes for different union types results in error

Fresh5 days ago
Mar 14, 20260 views
Confidence Score65%
65%

Problem

Query: [code block] Error: [code block] Should it really work like that, or is this a bug? Article and Program are both members of union type Content

Error Output

{
  curatedList {
     ...on Program {
        title(lang: "fi")
     }

     ...on Article {
        title
     }
  }
}
```

Error:

```
Fields title conflict because they have differing arguments.

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1 Fix

Canonical Fix
Unverified Fix
New Fix – Awaiting Verification

Resolve GraphQL Field Conflict by Standardizing Arguments

Medium Risk

The error occurs because GraphQL does not allow fields with the same name to have differing argument signatures within the same selection set. In this case, 'title' is queried with different arguments for 'Program' and 'Article', leading to a conflict.

Awaiting Verification

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  1. 1

    Identify Common Arguments

    Determine the common arguments required for the 'title' field across both 'Program' and 'Article'. If the 'lang' argument is necessary for both types, ensure it is included in both queries.

    graphql
    title(lang: "fi")
  2. 2

    Modify the Query

    Update the GraphQL query to ensure that both 'Program' and 'Article' use the same arguments for the 'title' field. If 'lang' is not required for 'Article', consider removing it from the 'Program' query or making it optional.

    graphql
    curatedList {
   ...on Program {
      title(lang: "fi")
   }
   ...on Article {
      title(lang: "fi")
   }
}
  3. 3

    Test the Updated Query

    Run the modified query in your GraphQL environment to ensure it executes without errors. Verify that the expected data is returned for both 'Program' and 'Article'.

    graphql
    query { curatedList { ... } }
  4. 4

    Review API Documentation

    Check the API documentation for any notes on field arguments and union types. Ensure that your implementation aligns with the latest specifications and best practices.

  5. 5

    Deploy Changes

    Once confirmed that the query works as expected, deploy the changes to your production environment. Monitor for any issues post-deployment.

Validation

Confirm the fix by executing the updated GraphQL query and checking that it returns the expected results without any errors. Additionally, review the API logs for any warnings or errors related to the query execution.

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Environment

Submitted by

AC

Alex Chen

2450 rep

Tags

graphqlapischema