ra-data-rest-client

Extends marmelab/ra-data-simple-rest with the abilty to work with resources that do not use 'id' as their unique identifier property name on the server side, and the ability to add a response transform function to a resource.

Why another rest client?

marmelab/react-admin requires that your server-side API expose your data using the 'id' parameter as your identifier property name for each data type.

But what if your server side doesn't conform to this, and the time/cost of making it appear as if it does is expensive?

Enter this extension. It will allow you to pass a propertyBag to the constructor specifying any resource names and their identifier property name for types that do not use 'id' as their property name.

Secondly, if you would like to manipulate the shape of your resources at the HTTP to app interface, as opposed to a Redux action or manipulating on the server side for the sake of the UI, there is a means to do this as well.

Installation

npm install --save ra-data-rest-client

REST Dialect

This Data Provider fits REST APIs using simple GET parameters for filters and sorting. This is the dialect used for instance in FakeRest.

Method	API calls
getList	GET http://my.api.url/posts?sort=["title","ASC"]&range=[0, 24]&filter={"title":"bar"}
getOne	GET http://my.api.url/posts/123
getMany	GET http://my.api.url/posts?filter={"id":[123,456,789]}
getManyReference	GET http://my.api.url/posts?filter={"author_id":345}
create	POST http://my.api.url/posts
update	PUT http://my.api.url/posts/123
updateMany	Multiple calls to PUT http://my.api.url/posts/123
delete	DELETE http://my.api.url/posts/123
deleteMany	Multiple calls to DELETE http://my.api.url/posts/123

Note: The simple REST data provider expects the API to include a Content-Range header in the response to getList calls. The value must be the total number of resources in the collection. This allows react-admin to know how many pages of resources there are in total, and build the pagination controls.

Content-Range: posts 0-24/319

If your API is on another domain as the JS code, you'll need to whitelist this header with an Access-Control-Expose-Headers CORS header.

Access-Control-Expose-Headers: Content-Range

Usage

// in src/App.js
import * as React from "react";
import { Admin, Resource } from 'react-admin';
import restDataProvider from 'ra-data-rest-client';

import { PostList } from './posts';

const App = () => (
    <Admin dataProvider={restDataProvider('http://path.to.my.api/', {
      /* resource: identifierParameterName */
      "testKVP": "key",
      "testUser": "userId",...
    },
    {
      /* resource: modifier function */
      "department": (d) => {
        // gives department resource a friendlier name that combines a few properties, for the sake of a SelectInput...
        d.NicerName = d.GroupName + " - " + d.SubName;
        return d;
      }
    })}>
        <Resource name="posts" list={PostList} />
    </Admin>
);

export default App;

Adding Custom Headers

The provider function accepts an HTTP client function as second argument. By default, they use react-admin's fetchUtils.fetchJson() as HTTP client. It's similar to HTML5 fetch(), except it handles JSON decoding and HTTP error codes automatically.

That means that if you need to add custom headers to your requests, you just need to wrap the fetchJson() call inside your own function:

import { fetchUtils, Admin, Resource } from 'react-admin';
import restDataProvider from 'ra-data-rest-client';

const httpClient = (url, options = {}) => {
    if (!options.headers) {
        options.headers = new Headers({ Accept: 'application/json' });
    }
    // add your own headers here
    options.headers.set('X-Custom-Header', 'foobar');
    return fetchUtils.fetchJson(url, options);
};
const dataProvider = restDataProvider('http://localhost:3000', {'resourceName':'key'...}, httpClient);

render(
    <Admin dataProvider={dataProvider} title="Example Admin">
       ...
    </Admin>,
    document.getElementById('root')
);

Now all the requests to the REST API will contain the X-Custom-Header: foobar header.

Tip: The most common usage of custom headers is for authentication. fetchJson has built-on support for the Authorization token header:

const httpClient = (url, options = {}) => {
  options.user = {
    authenticated: true,
    token: "SRTRDFVESGNJYTUKTYTHRG",
  };
  return fetchUtils.fetchJson(url, options);
};

Now all the requests to the REST API will contain the Authorization: SRTRDFVESGNJYTUKTYTHRG header.

Note about Content-Range

Historically, Simple REST Data Provider uses the http Content-Range header to retrieve the number of items in a collection. But this is a hack of the primary role of this header.

However this can be problematic, for example within an infrastructure using a Varnish that may use, modify or delete this header. We also have feedback indicating that using this header is problematic when you host your application on Vercel.

The solution is to use another http header to return the number of collection's items. The other header commonly used for this is X-Total-Count. So if you use X-Total-Count, you will have to :

• Whitelist this header with an Access-Control-Expose-Headers CORS header.

Access-Control-Expose-Headers: X-Total-Count

• Use the fourth parameter of restDataProvider to specify the name of the header to use :

// in src/App.js
import * as React from "react";
import { Admin, Resource } from 'react-admin';
import { fetchUtils } from 'ra-core';
import restDataProvider from 'ra-data-rest-client';

import { PostList } from './posts';

const App = () => (
    <Admin dataProvider={simpleRestProvider('http://path.to.my.api/', {'resourceName':'key'...}, fetchUtils.fetchJson, 'X-Total-Count')}>
        <Resource name="posts" list={PostList} />
    </Admin>
);

export default App;

License

This data provider is licensed under the MIT License