解决方案 2021，包含 React admin 版本 3.12.x 以上

Question

如果我有多个不同的REST API后端（单独的应用程序执行不同的事情），我想要一个能够对由这些不同后端管理的实体进行CRUD的UI（基于react-admin的）应用程序，我很好奇是否可以联系react-admin来做到这一点。

我想象的不是这个（单一/全局dataProvider）：

const App = () => (
    <Admin dataProvider={simpleRestProvider('http://path.to.foo.api')}>
        <Resource name="foos" list={FooList} />
    </Admin>
);

我们可以做这样的事情（特定于资源的dataProviders）：

    const App = () => (
        <Admin >
            <Resource name="foos" list={FooList} 
               dataProvider={simpleRestProvider('http://path.to.foo.api')} />
            <Resource name="bars" list={BarList} 
               dataProvider={simpleRestProvider('http://path.to.bar.api')} />
        </Admin>
    );

无论如何，如果你对如何在react-admin中对多个后端做REST的建议，我非常感激。

Answer 1

否，但是您可以拥有一个超级dataProvivder，它将根据资源选择适当的一个。像这样：

const dataProviders = [
    { dataProvider: simpleRestProvider('http://path.to.foo.api'), resources: ['foos'] },
    { dataProvider: simpleRestProvider('http://path.to.bar.api'), resources: ['bars'] },
];

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

    return dataProvider(type, resource, params);
}

Answer 2

在README of recent ra release (3.4.1)中，有一节（扩展数据提供程序（文件上传示例））提到：“ ...将两个后端的两个数据提供程序组合到单个对象中...”。您可以编写带有分支的包装器，以中继到其他提供程序的实现。在示例的顶部添加真实数据提供程序的示例是：

// new file dataProvider/super.js
import simpleRestProvider from 'ra-data-simple-rest';
import delayedDataProvider from './rest'

const realDataProvider = simpleRestProvider('http://real_world_url/');

const myDataProvider = {
    ...delayedDataProvider,
    getList: (resource, params) => {
        console.log(resource)
        if (["customers", "reviews", "commands"].includes(resource)) {
            // resources for the demo
            return delayedDataProvider.getList(resource, params)
        } else {
            // your own resources
            return realDataProvider.getList(resource, params)
        }
    },
};

export default myDataProvider;

，然后将延迟的DataProvider替换为上面的myDataProvider

// file dataProvider/index.js
         case 'graphql':
             return import('./graphql').then(factory => factory.default());
         default:
-            return import('./rest').then(provider => provider.default);
+            return import('./super').then(provider => provider.default);

免责声明：我和以前的帖子有同样的错误“提供程序不起作用...”

Answer 3

React Admin 3为dataProvider使用了新界面，并且所有答案似乎仅适用于React Admin 2。

这是我在React Admin 3上所做的工作

class CompositeDataProvider {
  constructor(dataProviders) {
    this.dataProviders = dataProviders;
  }

  _delegate(name, resource, params) {
    const { dataProvider } = this.dataProviders.find((dp) =>
      dp.resources.includes(resource)
    );

    return dataProvider[name](resource, params);
  }

  getList(resource, params) {
    return this._delegate("getList", resource, params);
  }
  getOne(resource, params) {
    return this._delegate("getOne", resource, params);
  }
  getMany(resource, params) {
    return this._delegate("getMany", resource, params);
  }
  getManyReference(resource, params) {
    return this._delegate("getManyReference", resource, params);
  }
  create(resource, params) {
    return this._delegate("create", resource, params);
  }
  update(resource, params) {
    return this._delegate("update", resource, params);
  }
  updateMany(resource, params) {
    return this._delegate("updateMany", resource, params);
  }
  delete(resource, params) {
    return this._delegate("delete", resource, params);
  }
  deleteMany(resource, params) {
    return this._delegate("deleteMany", resource, params);
  }
}

export default CompositeDataProvider;

您可以通过以下方式使用它：

const dataProvider = new compositeDataProvider([
  {
    dataProvider: jsonServerProvider("https://jsonplaceholder.typicode.com"),
    resources: ["posts", "users"],
  },
  {
    dataProvider: simpleRestProvider("http://path.to.bar.api"),
    resources: ["bars"],
  },
]);

它仍然是准系统，但是它给您一个可以改进的想法。

Answer 4

解决方案 2021，包含 React admin 版本 3.12.x 以上

我从@Gildas Garcia 的回答中得到了这个想法。非常感谢@Gildas Garcia。但是您的代码仅适用于 React admin 版本 2，在版本 3 及更高版本中，我需要一些习惯才能使其工作。这是我的解决方案

// ... others import
import {
  fetchUtils,
  GET_LIST,
  GET_ONE,
  CREATE,
  UPDATE,
  UPDATE_MANY,
  DELETE,
  GET_MANY,
  GET_MANY_REFERENCE,
} from 'react-admin';

const dataProviders = [ 
  {
    dataProvider: simpleRestProvider('http://localhost:3000'),
    resources: ['users'],
  },
  {
    dataProvider: simpleRestProvider('http://localhost:3002'),
    resources: ['roles'],
  },
  {
    dataProvider: customJSONDataProvider('http://localhost:3003'),
    resources: ['permissions'],
  },
];

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

  const mappingType = {
    [GET_LIST]: 'getList',
    [GET_ONE]: 'getOne',
    [GET_MANY]: 'getMany',
    [GET_MANY_REFERENCE]: 'getManyReference',
    [CREATE]: 'create',
    [UPDATE]: 'update',
    [UPDATE_MANY]: 'updateMany',
    [DELETE]: 'delete',
  };

  return dataProviderMapping.dataProvider[mappingType[type]](resource, params);
};

Answer 5

您可以自定义资源，选择要使用的api。一位管理员只有一个dataProvider。

      <Admin
        dataProvider={superDataProvider}
     />

但是您可以这样做：

 import superDataProvider from './dataProviderFactory';

以下是我的代码，您可以参考

import dataProviderRuby from './dataProvider'; //handle ruby dataProvider
import dataProviderJava from './dataProviderForJava';// handle java dataProvider
import { rubyClient, javaClient } from './apolloClient';//custom two diff client one will fetch ruby service ,other will java

const IsOmsResource = resource => {
  const omsReource = [
    'markets',
    'regions',
    'countries',
    'states',
    'items',
    'salesOrganizations',
  ];
  return omsReource.some(ele => ele === resource);
}; //those resource will fetch data from java service others will go to ruby

const rubyDataProvider = async (type, resource, params) => {
  const provider = await dataProviderRuby({
    client: rubyClient,
  });
  return provider(type, resource, params);
};

const javaDataProvider = async (type, resource, params) => {
  const provider = await dataProviderJava({
    client: javaClient,
  });
  return provider(type, resource, params);
};

const superDataProvider = (type, resource, params) => {
  if (IsOmsResource(resource)) {
    console.log('当前Java', resource);
    return javaDataProvider(type, resource, params);
  }

  console.log('当前ruby', resource);
  return rubyDataProvider(type, resource, params);
};

export default superDataProvider;

以下是“ ./apolloClient”

import ApolloClient from 'apollo-client';
import { createHttpLink } from 'apollo-link-http';
import { InMemoryCache } from 'apollo-cache-inmemory';
import { setContext } from 'apollo-link-context';

const httpLinkRuby = createHttpLink({
  uri: '/graphql',
});
const httpLinkJava = createHttpLink({
  uri: '/oms-graphql',
});
const authLink = setContext((_, { headers }) => {
  const token = localStorage.getItem('token');
  return {
    headers: {
      ...headers,
      authorization: token ? `Bearer ${token}` : '',
    },
  };
});
export const rubyClient = new ApolloClient({
  link: httpLinkRuby,
  cache: new InMemoryCache(),
});
export const javaClient = new ApolloClient({
  link: authLink.concat(httpLinkJava),
  cache: new InMemoryCache(),
});

是否有可能在react-admin中拥有多个dataProviders？

5 个答案:

解决方案 2021，包含 React admin 版本 3.12.x 以上