hasura/graphql-engine · error · InternalDeveloperError

Field mapping not found for the field {field_name:} of type

Error message

Field mapping not found for the field {field_name:} of type {type_name:}

What it means

Thrown during GraphQL-to-IR translation when a field selected in the query has no corresponding mapping in the NDC/connector field mapping for its type. The IR builder walks the selection set against the type's mapped fields and fails to find field_name on type_name. It almost always indicates a mismatch between the GraphQL schema and the underlying data connector metadata.

Source

Thrown at v3/crates/graphql/ir/src/error.rs:194

    #[error("No function/procedure specified for command field {field_name} of type {type_name}")]
    NoFunctionOrProcedure {
        type_name: ast::TypeName,
        field_name: ast::Name,
    },

    #[error("No argument source specified for argument {argument_name} of field {field_name}")]
    NoArgumentSource {
        field_name: ast::Name,
        argument_name: ast::Name,
    },

    #[error("Mapping for the {mapping_kind} typename {type_name:} not found")]
    TypenameMappingNotFound {
        type_name: ast::TypeName,
        mapping_kind: &'static str,
    },

    #[error("Field mapping not found for the field {field_name:} of type {type_name:}")]
    FieldMappingNotFound {
        type_name: Qualified<CustomTypeName>,
        field_name: FieldName,
    },

    #[error("Object type '{type_name}' not found")]
    ObjectTypeNotFound {
        type_name: Qualified<CustomTypeName>,
    },

    #[error("The field '{field_name}' was not found on object type '{object_type_name}'")]
    ObjectTypeFieldNotFound {
        field_name: FieldName,
        object_type_name: Qualified<CustomTypeName>,
    },

    #[error("{0}")]
    RelationshipFieldMappingError(#[from] plan::RelationshipFieldMappingError),

View on GitHub (pinned to 724551b9ae)

Solutions

1. Regenerate or update the data connector metadata so every exposed field has a mapping
2. Verify the field name in the query matches the current schema (no stale persisted queries/clients)
3. Check that relationships and nested selections only reference mapped fields
4. Rebuild/redeploy so schema and metadata versions are in sync

Example fix

# before
query { users { nickname } }  # column renamed to handle
# after
query { users { handle } }

// Before executing, check the field exists on the type in the fetched schema
const fields = schema.getType('user').getFields();
if (!fields['nickname']) throw new Error('field missing on type');

const isKnownField = (schema, typeName, f) =>
  !!schema.getType(typeName)?.getFields()?.[f];

// Match on the IR error message containing 'Field mapping not found' and surface a schema/metadata drift hint

When it happens

Trigger: Selecting a field in a query that exists in the GraphQL schema but is missing from the data connector mapping for that object type; using a stale/misordered metadata after a schema change; relationships referencing fields that were renamed without updating mappings.

Common situations: Adding a field to a model but not regenerating/pushing connector metadata; renaming a column while the GraphQL schema still exposes the old field name; version drift between the CLI that generated metadata and the engine version resolving the query.

Related errors

• Unexpected value: expecting {expected_kind:}, but found: {fo
• Object type '{type_name}' not found
• Argument mapping not found for the argument {argument_name:}
• Cannot add query root field {0} as it already in use
• Cannot add mutation root field {0} as it already in use

AI-assisted analysis of hasura/graphql-engine@724551b9ae (2026-08-28). Data as JSON: /api/errors/81bdac8247bd1fdc. Report an issue: GitHub.