Enum CompositionError 

pub enum CompositionError {
    ExternalFieldNoOwner {
        field: String,
    },
    ExternalFieldMultipleOwners {
        field: String,
        owners: Vec<String>,
    },
    KeyMismatch {
        typename: String,
        key_a: Vec<String>,
        key_b: Vec<String>,
    },
    ShareableFieldConflict {
        typename: String,
        field: String,
        subgraph_a: String,
        subgraph_b: String,
    },
    TypeConflict {
        typename: String,
        reason: String,
    },
}

Errors during schema composition

These errors indicate problems with multi-subgraph federation that prevent the supergraph from being composed. Each error includes context for debugging.

Variants

ExternalFieldNoOwner

@external field has no owning subgraph

An @external field was marked in a subgraph extension, but no other subgraph defines this field as local (non-external).

Fields

field: String

ExternalFieldMultipleOwners

@external field owned by multiple subgraphs

An @external field reference conflicts: multiple subgraphs claim to own it. Only one subgraph can own each @external field.

Fields

field: String

owners: Vec<String>

KeyMismatch

@key directive mismatch across subgraphs

The @key directive on a type differs across subgraphs. All subgraphs must agree on the @key for a given type.

Fields

typename: String

key_a: Vec<String>

key_b: Vec<String>

ShareableFieldConflict

@shareable field conflict (shareable in one, not in another)

A field is marked @shareable in one subgraph but not in another. @shareable must be consistent across all subgraphs that define a field.

Fields

typename: String

field: String

subgraph_a: String

subgraph_b: String

TypeConflict

Type definition conflict

A type definition conflict that doesn’t fit other categories.

Fields

typename: String

reason: String

Trait Implementations

impl Clone for CompositionError

fn clone(&self) -> CompositionError

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CompositionError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for CompositionError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for CompositionError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.