让Meteor.publish安装程序执行一些异步请求(例如应用程序接口),然后返回您想要在React组件中显示的数据,这是一个什么样的过程?发布是如何工作的,客户端代码如何访问它?如果可能的话,我想用withTracker函数来做这件事。谢谢!
发布于 2018-06-10 23:38:59
这个指南应该会有所帮助:Publications and Data Loading。
基本上,您需要了解Meteor的low-level API是如何工作的,以便您知道如何将您想要的任何数据集发布到客户端Mongo集合。此外,为了发布来自其他API端点的数据,本指南的this part展示了一个非常清晰的示例。
至于在客户端订阅这种自定义发布,就像订阅典型的MongoDB类型发布一样简单。请注意,正如我在上面提到的,不同之处在于,您是在向Client-side collection发布/从a订阅。
下面是我自己写的一个简单的例子。我不太了解React,但客户端代码主要基于Meteor的教程:
/* client side */
import React, { Component } from 'react';
import { withTracker } from 'meteor/react-meteor-data';
import { Meteor } from 'meteor/meteor';
import { Mongo } from 'meteor/mongo';
const Foo = new Mongo.Collection('Foo');
class App extends Component {
renderFoo() {
return this.props.foos.map((foo) => (
<Foo key={foo._id} foo={foo} />
));
}
}
export default withTracker(() => {
Meteor.subscribe('publishFromAnApi', ...args);
return {
foos: Foo.find().fetch(),
};
})(App);
/* server side */
import { Meteor } from 'meteor/meteor';
import { HTTP } from 'meteor/http';
Meteor.publish('publishFromAnApi', function publishFromAnApi(...args) { // must use a function instead of an arrow function here for the sake of `this`
const publishedKey = {};
const collectionName = 'Foo'; // same name of the client side collection mentioned in line 6
const poll = () => {
const { data } = HTTP.get('/some/api/route', { ...someArgsToRequest });
for (let i = 0; i < data.responseFromAPI; i += 1) { // just a random example here, assuming responseFromAPI is an array
const document = data.responseFromAPI[i];
const id = <the id of the document; normally is in Mongo.ObjectID type>;
// some logics might be going on...
if (!publishedKey[id]) {
this.added(collectionName, id, document);
publishedKey[id] = true;
} else {
this.changed(collectionName, id, document);
}
}
};
poll();
this.ready();
const interval = Meteor.setInterval(poll, <poll interval>);
this.onStop(() => {
Meteor.clearInterval(interval);
});
});
https://stackoverflow.com/questions/50780760
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