marmelab/react-admin · error · Error

getManyReference is not implemented

Error message

getManyReference is not implemented

What it means

testDataProvider's default getManyReference throws unless overridden. getManyReference serves foreign-key lists (ReferenceManyField, useGetManyReference), so this error means a test rendered such a component without stubbing it.

Source

Thrown at packages/ra-core/src/dataProvider/testDataProvider.ts:29

const defaultTestDataProvider: DataProvider = {
    create: async () => {
        throw new Error('create is not implemented');
    },
    delete: async () => {
        throw new Error('delete not implemented');
    },
    deleteMany: async () => {
        throw new Error('deleteMany is not implemented');
    },
    getList: async () => {
        throw new Error('getList is not implemented');
    },
    getMany: async () => {
        throw new Error('getMany is not implemented');
    },
    getManyReference: async () => {
        throw new Error('getManyReference is not implemented');
    },
    getOne: async () => {
        throw new Error('getOne is not implemented');
    },
    update: async () => {
        throw new Error('update not implemented');
    },
    updateMany: async () => {
        throw new Error('updateMany not implemented');
    },
};
export const testDataProvider = (
    overrides?: Partial<DataProvider>
): DataProvider => ({
    ...defaultTestDataProvider,
    ...overrides,
});

View on GitHub (pinned to 051f511bb0)

Solutions

  1. Stub getManyReference: testDataProvider({ getManyReference: async () => ({ data: [...], total: n }) })
  2. Use mockProvider with the related resource's records
  3. Render the related list with mocked children or mock useGetManyReference at the hook level

Example fix

// before
const dataProvider = testDataProvider();
// after
const dataProvider = testDataProvider({
  getManyReference: async () => ({ data: [{ id: 1, post_id: 9 }], total: 1 }),
});
Defensive patterns

Strategy: try-catch

Validate before calling

if (!dataProviderOverrides.getManyReference) throw new Error('test must stub getManyReference');

Try / catch

try { await dataProvider.getManyReference(r, params); } catch (e) { /* stub getManyReference */ throw e; }

Prevention

When it happens

Trigger: Rendering <ReferenceManyField> or calling useGetManyReference in tests using testDataProvider() without a getManyReference override.

Common situations: Testing comments-below-a-post style UI; stubbing getList but forgetting the reference variant; integration tests mounting Show pages containing ReferenceManyField.

Related errors

AI-assisted analysis of marmelab/react-admin@051f511bb0 (2026-08-30). Data as JSON: /api/errors/94ed7ee8cea7c73c. Report an issue: GitHub.