Gazebo_simulation-Frontend/node_modules/ra-data-json-server

JSON Server Data Provider For React-Admin

JSON Server Data Provider for react-admin, the frontend framework for building admin applications on top of REST/GraphQL services.

Installation

npm install --save ra-data-json-server

REST Dialect

This Data Provider fits REST APIs powered by JSON Server, such as JSONPlaceholder.

Method	API calls
getList	GET http://my.api.url/posts?_sort=title&_order=ASC&_start=0&_end=24&title=bar
getOne	GET http://my.api.url/posts/123
getMany	GET http://my.api.url/posts/123, GET http://my.api.url/posts/456, GET http://my.api.url/posts/789
getManyReference	GET http://my.api.url/posts?author_id=345
create	POST http://my.api.url/posts/123
update	PUT http://my.api.url/posts/123
updateMany	PUT http://my.api.url/posts/123, PUT http://my.api.url/posts/456, PUT http://my.api.url/posts/789
delete	DELETE http://my.api.url/posts/123

Note: The JSON Server REST Data Provider expects the API to include a X-Total-Count header in the response to getList and getManyReference 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.

X-Total-Count: 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: X-Total-Count

Usage

// in src/App.js
import React from 'react';
import { Admin, Resource } from 'react-admin';
import jsonServerProvider from 'ra-data-json-server';

import { PostList } from './posts';

const App = () => (
    <Admin dataProvider={jsonServerProvider('http://jsonplaceholder.typicode.com')}>
        <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 jsonServerProvider from 'ra-data-json-server';

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 = jsonServerProvider('http://jsonplaceholder.typicode.com', 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.

License

This data provider is licensed under the MIT License, and sponsored by marmelab.