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implementation.test.js
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import fs from 'fs';
import path from 'path';
import invariant from 'assert';
import * as babel from '@babel/core';
import tmp from 'tmp-promise';
import _ from 'lodash';
import codegen from '../src/codegen';
import { getConfig } from '../src/config';
const BABEL_CONFIG = {
presets: [
'@babel/preset-flow',
[
'@babel/preset-env',
{
modules: 'commonjs',
},
],
],
};
const RUNTIME_HELPERS = path.resolve(__dirname, '..', 'src', 'runtimeHelpers.ts');
tmp.setGracefulCleanup();
jest.setTimeout(10000);
expect.extend({
toBeError(received, message = '', errorType = 'Error') {
const regex = _.isRegExp(message) ? message : new RegExp(_.escapeRegExp(message));
const pass = _.isError(received) && regex.test(received.message) && received.name === errorType;
if (pass) {
return {
message: () => `expected ${received} not to be an error with message matching: ${message}}`,
pass: true,
};
} else {
return {
message: () => `expected ${received} to be ${errorType} with message matching: ${message}}`,
pass: false,
};
}
},
});
async function createDataLoaders(config, cb) {
await tmp.withFile(
async ({ path }) => {
const loadersCode = await babel.transformAsync(codegen(config, RUNTIME_HELPERS), BABEL_CONFIG);
fs.writeFileSync(path, 'const regeneratorRuntime = require("regenerator-runtime");');
fs.appendFileSync(path, loadersCode.code);
// Import the generated code into memory :scream:
// TODO: maybe do this in a vm or something?
const getLoaders = require(path).default;
await cb(getLoaders);
},
{ dir: path.join(__dirname, 'test-tmp-files') },
);
}
test('non batch endpoint', async () => {
const config = {
resources: {
foo: {
isBatchResource: false,
docsLink: 'example.com/docs/foo',
},
},
};
const resources = {
foo: jest
.fn()
.mockReturnValueOnce(
Promise.resolve({
message: 'knock knock',
message_suffix: '!',
}),
)
.mockReturnValueOnce(
Promise.resolve({
message: "who's there",
message_suffix: '?',
}),
),
};
await createDataLoaders(config, async (getLoaders) => {
const loaders = getLoaders(resources);
const results = await loaders.foo.loadMany([{ bar_id: 1 }, { bar_id: 2 }]);
expect(results).toEqual([
{ message: 'knock knock', message_suffix: '!' },
{ message: "who's there", message_suffix: '?' },
]);
});
});
test('batch endpoint', async () => {
const config = {
resources: {
foo: {
isBatchResource: true,
docsLink: 'example.com/docs/bar',
batchKey: 'foo_ids',
newKey: 'foo_id',
},
},
};
const resources = {
foo: ({ foo_ids }) => {
expect(foo_ids).toEqual([1, 2, 3]);
return Promise.resolve([
{ foo_id: 1, foo_value: 'hello' },
{ foo_id: 2, foo_value: 'world' },
{ foo_id: 3, foo_value: '!' },
]);
},
};
await createDataLoaders(config, async (getLoaders) => {
const loaders = getLoaders(resources);
const results = await loaders.foo.loadMany([{ foo_id: 1 }, { foo_id: 2 }, { foo_id: 3 }]);
expect(results).toEqual([
{ foo_id: 1, foo_value: 'hello' },
{ foo_id: 2, foo_value: 'world' },
{ foo_id: 3, foo_value: '!' },
]);
});
});
test("batch endpoint can't be called with null", async () => {
const config = {
resources: {
foo: {
isBatchResource: true,
docsLink: 'example.com/docs/bar',
batchKey: 'foo_ids',
newKey: 'foo_id',
},
},
};
const resources = {
foo: ({ foo_ids }) => {
expect(foo_ids).toEqual([1]);
return Promise.resolve([{ foo_id: 1, foo_value: 'hello' }]);
},
};
await createDataLoaders(config, async (getLoaders) => {
const loaders = getLoaders(resources);
expect(() => {
loaders.foo.load(null);
}).toThrow(TypeError);
});
});
test('batch endpoint (with reorderResultsByKey)', async () => {
const config = {
resources: {
foo: {
isBatchResource: true,
docsLink: 'example.com/docs/bar',
batchKey: 'foo_ids',
newKey: 'foo_id',
reorderResultsByKey: 'foo_id',
},
},
};
const resources = {
foo: ({ foo_ids }) => {
expect(foo_ids).toEqual([1, 2, 3]);
return Promise.resolve([
{ foo_id: 2, foo_value: 'world' },
{ foo_id: 1, foo_value: 'hello' },
{ foo_id: 3, foo_value: '!' },
]);
},
};
await createDataLoaders(config, async (getLoaders) => {
const loaders = getLoaders(resources);
const results = await loaders.foo.loadMany([{ foo_id: 1 }, { foo_id: 2 }, { foo_id: 3 }]);
expect(results).toEqual([
{ foo_id: 1, foo_value: 'hello' },
{ foo_id: 2, foo_value: 'world' },
{ foo_id: 3, foo_value: '!' },
]);
});
});
test('batch endpoint (with nestedPath)', async () => {
const config = {
resources: {
foo: {
isBatchResource: true,
docsLink: 'example.com/docs/bar',
batchKey: 'foo_ids',
newKey: 'foo_id',
nestedPath: 'foos',
},
},
};
const resources = {
foo: ({ foo_ids }) => {
expect(foo_ids).toEqual([1, 2, 3]);
return Promise.resolve({
foos: [
{ foo_id: 1, foo_value: 'hello' },
{ foo_id: 2, foo_value: 'world' },
{ foo_id: 3, foo_value: '!' },
],
});
},
};
await createDataLoaders(config, async (getLoaders) => {
const loaders = getLoaders(resources);
const results = await loaders.foo.loadMany([{ foo_id: 1 }, { foo_id: 2 }, { foo_id: 3 }]);
expect(results).toEqual([
{ foo_id: 1, foo_value: 'hello' },
{ foo_id: 2, foo_value: 'world' },
{ foo_id: 3, foo_value: '!' },
]);
});
});
test('batch endpoint (with commaSeparatedBatchKey)', async () => {
const config = {
resources: {
foo: {
isBatchResource: true,
docsLink: 'example.com/docs/bar',
batchKey: 'foo_ids',
newKey: 'foo_id',
commaSeparatedBatchKey: true,
},
},
};
const resources = {
foo: ({ foo_ids }) => {
expect(foo_ids).toEqual('1,2,3');
return Promise.resolve([
{ foo_id: 1, foo_value: 'hello' },
{ foo_id: 2, foo_value: 'world' },
{ foo_id: 3, foo_value: '!' },
]);
},
};
await createDataLoaders(config, async (getLoaders) => {
const loaders = getLoaders(resources);
const results = await loaders.foo.loadMany([{ foo_id: 1 }, { foo_id: 2 }, { foo_id: 3 }]);
expect(results).toEqual([
{ foo_id: 1, foo_value: 'hello' },
{ foo_id: 2, foo_value: 'world' },
{ foo_id: 3, foo_value: '!' },
]);
});
});
test('batch endpoint (multiple requests)', async () => {
const config = {
resources: {
foo: {
isBatchResource: true,
docsLink: 'example.com/docs/bar',
batchKey: 'foo_ids',
newKey: 'foo_id',
},
},
};
const resources = {
foo: ({ foo_ids, include_extra_info }) => {
if (_.isEqual(foo_ids, [1, 2])) {
expect(include_extra_info).toBe(false);
return Promise.resolve([
{ foo_id: 1, foo_value: 'hello' },
{ foo_id: 2, foo_value: 'world' },
]);
}
if (_.isEqual(foo_ids, [3])) {
expect(include_extra_info).toBe(true);
return Promise.resolve([
{
foo_id: 3,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
]);
}
},
};
await createDataLoaders(config, async (getLoaders) => {
const loaders = getLoaders(resources);
const results = await loaders.foo.loadMany([
{ foo_id: 1, include_extra_info: false },
{ foo_id: 2, include_extra_info: false },
{ foo_id: 3, include_extra_info: true },
]);
expect(results).toEqual([
{ foo_id: 1, foo_value: 'hello' },
{ foo_id: 2, foo_value: 'world' },
{ foo_id: 3, foo_value: 'greetings', extra_stuff: 'lorem ipsum' },
]);
});
});
test('batch endpoint that rejects', async () => {
const config = {
resources: {
foo: {
isBatchResource: true,
docsLink: 'example.com/docs/bar',
batchKey: 'foo_ids',
newKey: 'foo_id',
},
},
};
const resources = {
foo: ({ foo_ids, include_extra_info }) => {
if (_.isEqual(foo_ids, [1, 3])) {
expect(include_extra_info).toBe(false);
return Promise.reject('yikes');
}
if (_.isEqual(foo_ids, [2, 4, 5])) {
expect(include_extra_info).toBe(true);
return Promise.resolve([
{
foo_id: 2,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
{
foo_id: 4,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
{
foo_id: 5,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
]);
}
},
};
await createDataLoaders(config, async (getLoaders) => {
const loaders = getLoaders(resources);
const results = await loaders.foo.loadMany([
{ foo_id: 1, include_extra_info: false },
{ foo_id: 2, include_extra_info: true },
{ foo_id: 3, include_extra_info: false },
{ foo_id: 4, include_extra_info: true },
{ foo_id: 5, include_extra_info: true },
]);
// NonError comes from the default error handler which uses ensure-error
expect(results).toMatchObject([
expect.toBeError(/yikes/, 'NonError'),
{ foo_id: 2, foo_value: 'greetings', extra_stuff: 'lorem ipsum' },
expect.toBeError(/yikes/, 'NonError'),
{ foo_id: 4, foo_value: 'greetings', extra_stuff: 'lorem ipsum' },
{ foo_id: 5, foo_value: 'greetings', extra_stuff: 'lorem ipsum' },
]);
});
});
test('batch endpoint (multiple requests, default error handling)', async () => {
const config = {
resources: {
foo: {
isBatchResource: true,
docsLink: 'example.com/docs/bar',
batchKey: 'foo_ids',
newKey: 'foo_id',
},
},
};
const resources = {
foo: ({ foo_ids, include_extra_info }) => {
if (_.isEqual(foo_ids, [1, 3])) {
expect(include_extra_info).toBe(false);
throw new Error('yikes');
}
if (_.isEqual(foo_ids, [2, 4, 5])) {
expect(include_extra_info).toBe(true);
return Promise.resolve([
{
foo_id: 2,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
{
foo_id: 4,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
{
foo_id: 5,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
]);
}
},
};
await createDataLoaders(config, async (getLoaders) => {
const loaders = getLoaders(resources);
const results = await loaders.foo.loadMany([
{ foo_id: 1, include_extra_info: false },
{ foo_id: 2, include_extra_info: true },
{ foo_id: 3, include_extra_info: false },
{ foo_id: 4, include_extra_info: true },
{ foo_id: 5, include_extra_info: true },
]);
expect(results).toMatchObject([
expect.toBeError(/yikes/),
{ foo_id: 2, foo_value: 'greetings', extra_stuff: 'lorem ipsum' },
expect.toBeError(/yikes/),
{ foo_id: 4, foo_value: 'greetings', extra_stuff: 'lorem ipsum' },
{ foo_id: 5, foo_value: 'greetings', extra_stuff: 'lorem ipsum' },
]);
});
});
test('batch endpoint (multiple requests, custom error handling)', async () => {
async function errorHandler(resourcePath, error) {
expect(resourcePath).toEqual(['foo']);
expect(error.message).toBe('yikes');
return new Error('hello from custom error handler');
}
const config = {
resources: {
foo: {
isBatchResource: true,
docsLink: 'example.com/docs/bar',
batchKey: 'foo_ids',
newKey: 'foo_id',
},
},
};
const resources = {
foo: ({ foo_ids, include_extra_info }) => {
if (_.isEqual(foo_ids, [1, 3])) {
expect(include_extra_info).toBe(false);
throw new Error('yikes');
}
if (_.isEqual(foo_ids, [2, 4, 5])) {
expect(include_extra_info).toBe(true);
return Promise.resolve([
{
foo_id: 2,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
{
foo_id: 4,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
{
foo_id: 5,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
]);
}
},
};
await createDataLoaders(config, async (getLoaders) => {
const loaders = getLoaders(resources, { errorHandler });
const results = await loaders.foo.loadMany([
{ foo_id: 1, include_extra_info: false },
{ foo_id: 2, include_extra_info: true },
{ foo_id: 3, include_extra_info: false },
{ foo_id: 4, include_extra_info: true },
{ foo_id: 5, include_extra_info: true },
]);
expect(results).toMatchObject([
expect.toBeError(/hello from custom error handler/),
{ foo_id: 2, foo_value: 'greetings', extra_stuff: 'lorem ipsum' },
expect.toBeError(/hello from custom error handler/),
{ foo_id: 4, foo_value: 'greetings', extra_stuff: 'lorem ipsum' },
{ foo_id: 5, foo_value: 'greetings', extra_stuff: 'lorem ipsum' },
]);
});
});
test('batch endpoint (multiple requests, error handling, nestedPath)', async () => {
const config = {
eek: true,
resources: {
foo: {
isBatchResource: true,
docsLink: 'example.com/docs/bar',
batchKey: 'foo_ids',
newKey: 'foo_id',
nestedPath: 'foo_data',
},
},
};
const resources = {
foo: ({ foo_ids, include_extra_info }) => {
if (_.isEqual(foo_ids, [1, 3])) {
expect(include_extra_info).toBe(false);
return new Error('yikes');
}
if (_.isEqual(foo_ids, [2, 4, 5])) {
expect(include_extra_info).toBe(true);
return Promise.resolve({
foo_data: [
{
foo_id: 2,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
{
foo_id: 4,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
{
foo_id: 5,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
],
});
}
},
};
await createDataLoaders(config, async (getLoaders) => {
const loaders = getLoaders(resources);
const results = await loaders.foo.loadMany([
{ foo_id: 1, include_extra_info: false },
{ foo_id: 2, include_extra_info: true },
{ foo_id: 3, include_extra_info: false },
{ foo_id: 4, include_extra_info: true },
{ foo_id: 5, include_extra_info: true },
]);
expect(results).toMatchObject([
expect.toBeError(/yikes/),
{ foo_value: 'greetings', extra_stuff: 'lorem ipsum' },
expect.toBeError(/yikes/),
{ foo_value: 'greetings', extra_stuff: 'lorem ipsum' },
{ foo_value: 'greetings', extra_stuff: 'lorem ipsum' },
]);
});
});
test('batch endpoint (multiple requests, error handling - non array response)', async () => {
const config = {
eek: true,
resources: {
foo: {
isBatchResource: true,
docsLink: 'example.com/docs/bar',
batchKey: 'foo_ids',
newKey: 'foo_id',
},
},
};
const resources = {
foo: ({ foo_ids, include_extra_info }) => {
if (_.isEqual(foo_ids, [1, 3])) {
expect(include_extra_info).toBe(false);
return new Error('yikes');
}
if (_.isEqual(foo_ids, [2, 4, 5])) {
expect(include_extra_info).toBe(true);
// Deliberately returning an object, not an array
return Promise.resolve({
foo: 'bar',
});
}
},
};
await createDataLoaders(config, async (getLoaders) => {
const loaders = getLoaders(resources);
const results = await loaders.foo.loadMany([
{ foo_id: 1, include_extra_info: false },
{ foo_id: 2, include_extra_info: true },
{ foo_id: 3, include_extra_info: false },
{ foo_id: 4, include_extra_info: true },
{ foo_id: 5, include_extra_info: true },
]);
expect(results).toMatchObject([
expect.toBeError('yikes'),
expect.toBeError('[dataloader-codegen :: foo] Expected response to be an array'),
expect.toBeError('yikes'),
expect.toBeError('[dataloader-codegen :: foo] Expected response to be an array'),
expect.toBeError('[dataloader-codegen :: foo] Expected response to be an array'),
]);
});
});
test('batch endpoint (multiple requests, error handling, with reordering)', async () => {
const config = {
resources: {
foo: {
isBatchResource: true,
docsLink: 'example.com/docs/bar',
batchKey: 'foo_ids',
newKey: 'foo_id',
reorderResultsByKey: 'foo_id',
},
},
};
const resources = {
foo: ({ foo_ids, include_extra_info }) => {
if (_.isEqual(foo_ids, [1, 3])) {
expect(include_extra_info).toBe(false);
return new Error('yikes');
}
if (_.isEqual(foo_ids, [2, 4, 5])) {
expect(include_extra_info).toBe(true);
// return items deliberately out of order
return Promise.resolve([
{
foo_id: 4,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
{
foo_id: 5,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
{
foo_id: 2,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
]);
}
},
};
await createDataLoaders(config, async (getLoaders) => {
const loaders = getLoaders(resources);
const results = await loaders.foo.loadMany([
{ foo_id: 1, include_extra_info: false },
{ foo_id: 2, include_extra_info: true },
{ foo_id: 3, include_extra_info: false },
{ foo_id: 4, include_extra_info: true },
{ foo_id: 5, include_extra_info: true },
]);
expect(results).toMatchObject([
expect.toBeError(/yikes/),
{ foo_id: 2, foo_value: 'greetings', extra_stuff: 'lorem ipsum' },
expect.toBeError(/yikes/),
{ foo_id: 4, foo_value: 'greetings', extra_stuff: 'lorem ipsum' },
{ foo_id: 5, foo_value: 'greetings', extra_stuff: 'lorem ipsum' },
]);
});
});
/**
* Without reorderResultsByKey:
* If we requested 3 items, but the resource only returns 2, we don't know which
* response is missing. It's unsafe to return any results, so we must throw an
* error for the whole set of requests.
*/
test('batch endpoint without reorderResultsByKey throws error for response with non existant items', async () => {
const config = {
resources: {
foo: {
isBatchResource: true,
docsLink: 'example.com/docs/bar',
batchKey: 'foo_ids',
newKey: 'foo_id',
},
},
};
const resources = {
foo: ({ foo_ids, bar }) => {
if (_.isEqual(foo_ids, [1, 2, 3])) {
return Promise.resolve([
{
foo_id: 1,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
// deliberately omit 2
{
foo_id: 3,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
]);
} else if (_.isEqual(foo_ids, [4])) {
return Promise.resolve([
{
foo_id: 4,
foo_value: 'greetings',
},
]);
}
},
};
await createDataLoaders(config, async (getLoaders) => {
const loaders = getLoaders(resources);
const results = await loaders.foo.loadMany([
{ foo_id: 1, include_extra_info: true },
{ foo_id: 2, include_extra_info: true },
{ foo_id: 3, include_extra_info: true },
{ foo_id: 4, include_extra_info: false },
]);
expect(results).toMatchObject([
expect.toBeError(
'[dataloader-codegen :: foo] Resource returned 2 items, but we requested 3 items',
'BatchItemNotFoundError',
),
expect.toBeError(
'[dataloader-codegen :: foo] Resource returned 2 items, but we requested 3 items',
'BatchItemNotFoundError',
),
expect.toBeError(
'[dataloader-codegen :: foo] Resource returned 2 items, but we requested 3 items',
'BatchItemNotFoundError',
),
{ foo_id: 4, foo_value: 'greetings' },
]);
});
});
test('batch endpoint with reorderResultsByKey handles response with non existant items', async () => {
const config = {
resources: {
foo: {
isBatchResource: true,
docsLink: 'example.com/docs/bar',
batchKey: 'foo_ids',
newKey: 'foo_id',
reorderResultsByKey: 'foo_id',
},
},
};
const resources = {
foo: ({ foo_ids, bar }) => {
if (_.isEqual(foo_ids, [1, 2, 3])) {
return Promise.resolve([
{
foo_id: 1,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
// deliberately omit 2
{
foo_id: 3,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
]);
} else if (_.isEqual(foo_ids, [4])) {
return Promise.resolve([
{
foo_id: 4,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
]);
}
},
};
await createDataLoaders(config, async (getLoaders) => {
const loaders = getLoaders(resources);
const results = await loaders.foo.loadMany([
{ foo_id: 1, bar: true },
{ foo_id: 2, bar: true },
{ foo_id: 3, bar: true },
{ foo_id: 4, bar: false },
]);
expect(results).toMatchObject([
{ foo_id: 1, foo_value: 'greetings', extra_stuff: 'lorem ipsum' },
expect.toBeError(
'[dataloader-codegen :: foo] Response did not contain item with foo_id = 2',
'BatchItemNotFoundError',
),
{ foo_id: 3, foo_value: 'greetings', extra_stuff: 'lorem ipsum' },
{ foo_id: 4, foo_value: 'greetings', extra_stuff: 'lorem ipsum' },
]);
});
});
test('batch endpoint with isResponseDictionary handles a response that returns a dictionary', async () => {
const config = {
resources: {
foo: {
isBatchResource: true,
docsLink: 'example.com/docs/foos',
batchKey: 'foo_ids',
newKey: 'foo_id',
isResponseDictionary: true,
},
},
};
const resources = {
foo: ({ foo_ids }) => {
expect(foo_ids).toEqual([1, 2, 3]);
return Promise.resolve({
2: { foo_id: 2, foo_value: 'world' },
1: { foo_id: 1, foo_value: 'hello' },
3: { foo_id: 3, foo_value: '!' },
});
},
};
await createDataLoaders(config, async (getLoaders) => {
const loaders = getLoaders(resources);
const results = await loaders.foo.loadMany([{ foo_id: 1 }, { foo_id: 2 }, { foo_id: 3 }]);
expect(results).toEqual([
{ foo_id: 1, foo_value: 'hello' },
{ foo_id: 2, foo_value: 'world' },
{ foo_id: 3, foo_value: '!' },
]);
});
});
test('batch endpoint with isBatchKeyASet handles a response', async () => {
const config = {
resources: {
foo: {
isBatchResource: true,
docsLink: 'example.com/docs/bar',
batchKey: 'foo_ids',
newKey: 'foo_id',
isBatchKeyASet: true,
},
},
};
const resources = {
foo: ({ foo_ids, include_extra_info }) => {
if (_.isEqual(foo_ids, [1, 2])) {
expect(include_extra_info).toBe(false);
return Promise.resolve([
{ foo_id: 1, foo_value: 'hello' },
{ foo_id: 2, foo_value: 'world' },
]);
}
if (_.isEqual(foo_ids, [3])) {
expect(include_extra_info).toBe(true);
return Promise.resolve([
{
foo_id: 3,
foo_value: 'greetings',
extra_stuff: 'lorem ipsum',
},
]);
}
},
};
await createDataLoaders(config, async (getLoaders) => {
const loaders = getLoaders(resources);
const results = await loaders.foo.loadMany([
{ foo_id: 1, include_extra_info: false },
{ foo_id: 2, include_extra_info: false },
{ foo_id: 3, include_extra_info: true },
]);
expect(results).toEqual([
{ foo_id: 1, foo_value: 'hello' },
{ foo_id: 2, foo_value: 'world' },
{ foo_id: 3, foo_value: 'greetings', extra_stuff: 'lorem ipsum' },
]);
});
});
test('batch endpoint with isResponseDictionary handles a response that returns a dictionary, with a missing item', async () => {
const config = {
resources: {
foo: {
isBatchResource: true,
docsLink: 'example.com/docs/foos',
batchKey: 'foo_ids',
newKey: 'foo_id',
isResponseDictionary: true,
},
},
};
const resources = {
foo: ({ foo_ids }) => {
expect(foo_ids).toEqual([1, 2, 3]);
return Promise.resolve({
1: { foo_id: 1, foo_value: 'hello' },
3: { foo_id: 3, foo_value: '!' },
});
},
};
await createDataLoaders(config, async (getLoaders) => {
const loaders = getLoaders(resources);
const results = await loaders.foo.loadMany([{ foo_id: 1 }, { foo_id: 2 }, { foo_id: 3 }]);
expect(results).toEqual([
{ foo_id: 1, foo_value: 'hello' },
expect.toBeError(
'[dataloader-codegen :: foo] Could not find key = "2" in the response dict',
'BatchItemNotFoundError',
),
{ foo_id: 3, foo_value: '!' },
]);
});
});
test('middleware can transform the request args and the resource response', async () => {
function before(resourcePath, resourceArgs) {
expect(resourcePath).toEqual(['foo']);
expect(resourceArgs).toEqual([{ foo_ids: [100, 200, 300] }]);
// modify the arguments to the resource
return [{ foo_ids: [1, 2, 3] }];
}
function after(resourcePath, response) {
expect(resourcePath).toEqual(['foo']);
expect(response).toEqual([
{ foo_id: 1, foo_value: 'hello' },
{ foo_id: 2, foo_value: 'world' },
{ foo_id: 3, foo_value: '!' },
]);
return [
{ foo_id: 1, foo_value: 'goodbye' },
{ foo_id: 2, foo_value: 'world' },
{ foo_id: 3, foo_value: '?' },
];
}
const config = {
resources: {
foo: {
isBatchResource: true,
docsLink: 'example.com/docs/bar',
batchKey: 'foo_ids',
newKey: 'foo_id',
},
},
};
const resources = {