How is the correct way to have multiple dataProviders in react-admin?

Question

I\'m trying to use multiple dataproviders in a react-admin project but I have an error:

Warning: Missing translation for key: \"dataProvider is not a functio         


        

Answer 1

If you're wondering how to have multiple data sources as well as multiple dataProvider types i.e. rest, GraphQL e.t.c. The v3 docs state:

In react-admin v2, Data Providers used to be functions, not objects. React-admin v3 can detect a legacy Data Provider and wrap an object around it. So Data Providers developed for react-admin v2 still work with react-admin v3.

This means that the dataProvider property on the <Admin> component can take:

• An object of type DataProvider
• A function that provides (type, resource, params) returning a promise containing the data.

This means that if you provide your DataProvider is a function, you will have to create an adapter and call the functions on your provider manually. Here is an example.

./dataProviders.js

import { gqlDataProvider, restGQLDataProvider, restProvider } from './buildDataProviders';

// The first assumption is that all resources are unique, thus we can use an object or a map instead of an array. Key = resource, value = DataProvider.
const dataProviders = new Map([
  ['users', restGQLDataProvider],
  ['users-local', restProvider],
  ['Invoice', gqlDataProvider],
  ['Debtor',  gqlDataProvider],
  ['Status',  gqlDataProvider]
]);

export default async (type, resource, params) => {
  // Get the DataProvider from the map.
  const dataProvider = await dataProviders.get(resource);

  // The DataProvider object is wrapped in a function so we can pass in the parameters to get the result.
  if (dataProvider instanceof Function) {
    return dataProvider(type, resource, params);
  }
};

./buildDataProvider.js

import { gql } from 'apollo-boost';
import buildGraphQLProvider from 'ra-data-graphql-simple';
import { gqlClient, restClient } from './apolloClients';
import simpleRestProvider from 'ra-data-simple-rest';

const LOCAL_REST_ENDPOINT = 'http://localhost:3001/api';

export RestProvider = simpleRestProvider(LOCAL_REST_ENDPOINT);

export const gqlDataProvider = buildGraphQLProvider({
  client: gqlClient
});

// This is just an example of the getList provider, you'll have to write the rest.
export const restProvider = (type, resource, params) => {
  const providerMap = new Map([
    ['GET_LIST', async () => { 
      return await RestProvider.getList(resource, params);
    }]
   ])

export const restGQLDataProvider = (type, resource, params) => {
  const providerMap = new Map([
    ['GET_LIST', async () => {
      const query = gql`
        query ${resource} {
          ${resource} @rest(type: "${resource}", path: "/${resource}") {
              id
              name
              username
              email
              address
              phone
              website
              company
            }
          }
        `;
      
      const result = await restClient.query({ query });
          
      return { data: result.data[resource], total: result.data[resource].length };
    }]
  ])
}

./apolloClients.js

import { ApolloClient, ApolloLink, InMemoryCache, HttpLink } from 'apollo-boost';
import { RestLink } from 'apollo-link-rest';
import auth from '../../auth';

const GRAPHQL_ENDPOINT = 'http://localhost:4000';
const REST_ENDPOINT = 'http://jsonplaceholder.typicode.com';
const httpLink = new HttpLink({ uri: GRAPHQL_ENDPOINT });
const authLink = new ApolloLink((operation, forward) => {
  operation.setContext({
    headers: {
      'x-api-key': auth.aws_appsync_apiKey
    }
  });

  return forward(operation);
});

export const restClient = new ApolloClient({
  link: new RestLink({ uri: REST_ENDPOINT }),
  cache: new InMemoryCache()
});

export const gqlClient = new ApolloClient({
  link: authLink.concat(httpLink),
  cache: new InMemoryCache()
});

Answer 2

You're not calling the dataProvider you found, you're calling the mapping object from your array. You can fix it like this:

import simpleRestProvider from 'ra-data-simple-rest';

const dataProviders = [
  { dataProvider: simpleRestProvider('http://path.to.foo.api1'), resources: ['users1'] },
  { dataProvider: simpleRestProvider('http://path.to.foo.api2'), resources: ['users2'] },
];

export default (type, resource, params) => {
  const dataProviderMapping = dataProviders.find(dp => dp.resources.includes(resource));
  return dataProviderMapping.dataProvider(type, resource, params);
};

Answer 3

I was faced with the same problem in the new version 3.1

I decided to make a universal dataProvider

dataProvider.js

import {fetchUtils} from 'ra-core';
import ApiEndpoints from '../config/ApiEndpoints';
import {
	restGetList,
	restGetOne,
	restGetMany,
	restGetManyReference,
	restUpdate,
	restUpdateMany,
	restCreate,
	restDelete,
	restDeleteMany,
} from './rest/index';
import {CONSTANTS} from '../constants';

const httpClientTui = (url, options = {}) => {
	if (!options.headers) {
		// eslint-disable-next-line no-param-reassign
		options.headers = new Headers({Accept: 'application/json'});
	}
	const token = localStorage.getItem(CONSTANTS.CMS_KEY.TOKEN);
	options.headers.set('Authorization', `Bearer ${token}`);
	return fetchUtils.fetchJson(url, options);
};

function selectApiEndpoint(resource = '') {
	const result = {};
	result.apiEndpoint = 'https://jsonplaceholder.typicode.com';	// default parameters
	result.apiType = 'rest';
	Object.keys(ApiEndpoints).forEach((key) => {
		if (ApiEndpoints[key].url.includes(resource)) {
			result.apiEndpoint = key.toString();
			result.apiType = ApiEndpoints[key].type.toString();
		}
	});
	return {
		...result,
	};
}

export default (apiUrl, httpClient = httpClientTui) => ({
	getList: (resource, params) => {
		const {apiEndpoint, apiType} = selectApiEndpoint(resource);
		switch (apiType) {
			case 'rest':
				return restGetList(apiEndpoint, resource, params, httpClient);
			default:
				return restGetList(apiEndpoint, resource, params, httpClient);
		}
	},

	getOne: (resource, params) => {
		const {apiEndpoint, apiType} = selectApiEndpoint(resource);
		switch (apiType) {
			case 'rest':
				return restGetOne(apiEndpoint, resource, params, httpClient);
			default:
				return restGetOne(apiEndpoint, resource, params, httpClient);
		}
	},

	...
});

ApiEndpoints.js

module.exports = {
	'https://jsonplaceholder.typicode.com': {
		type: 'rest',
		url: [
			'posts',
			'comments',
			'albums',
			'photos',
			'todos',
			'users',
		],
	},
};

./rest/index.js

import {fetchUtils} from 'ra-core';
import {stringify} from 'query-string';

/**
 * From ra-data-json-server
 * https://github.com/marmelab/react-admin/blob/master/packages/ra-data-json-server/src/index.ts
 */

/**
 * Get list
 * @param apiEndpoint {string} - domain
 * @param resource {string} - URI request
 * @param params {object} - params request
 * @param httpClient {function}
 * @returns {{data: object, total: number}}
 */
export function restGetList(apiEndpoint, resource, params, httpClient) {
	const {page, perPage} = params.pagination;
	const {field, order} = params.sort;
	const query = {
		...fetchUtils.flattenObject(params.filter),
		_sort: field,
		_order: order,
		_start: (page - 1) * perPage,
		_end: page * perPage,
	};
	const url = `${apiEndpoint}/${resource}?${stringify(query)}`;

	return httpClient(url).then(({headers, json}) => {
		if (!headers.has('x-total-count')) {
			throw new Error(
				'not found x-total-count',
			);
		}
		return {
			data: json,
			total: parseInt(
				headers.get('x-total-count').split('/').pop()
			),
		};
	});
}

/**
 * Get one record
 * @param apiEndpoint {string} - domain
 * @param resource {string} - URI request
 * @param params {object} - params request
 * @param httpClient {function}
 * @returns {{data: object}}
 */
export function restGetOne(apiEndpoint, resource, params, httpClient) {
	return httpClient(`${apiEndpoint}/${resource}/${params.id}`).then(({json}) => ({
		data: json,
	}));
}

...