reactjs - React Apollo 客户端查询抛出错误“提供给`Query`的`array`类型的无效prop`children`，预期`function`”
问题描述
我正在开发一个 React JS 项目。我的应用需要使用 GraphQL API。所以我为此使用了 Apollo 客户端。当我将 Query 组件与 ApolloProvider 组件一起使用时，它会抛出错误。以下是我的代码。
这是我的 app.js
import React from "react";
import ReactDOM from "react-dom";
import { createBrowserHistory } from "history";
import { HashRouter, Route, Switch, Redirect } from "react-router-dom";
import AdminLayout from "./layouts/Admin";
import { ApolloProvider } from '@apollo/react-hooks';
import ApolloClient, { gql } from 'apollo-boost';
const client = new ApolloClient({
uri: 'https://48p1r2roz4.sse.codesandbox.io',
});
const hist = createBrowserHistory();
ReactDOM.render(
<ApolloProvider client={client}>
<HashRouter history={hist}>
<Switch>
<Route path="/admin" render={(props) => <AdminLayout {...props} />} />
<Redirect to="/admin/dashboard" />
</Switch>
</HashRouter>
</ApolloProvider>,
document.getElementById("app")
);
如您所见，我声明了 Apollo 客户端并将其分配给 ApolloProvider 组件的 client 属性。
我有一个名为 RestaurantForm 的组件，它使用 GraphQL Query 组件，如下所示。
import React from 'react';
import {Button, Card, CardBody, CardFooter, CardHeader, CardTitle, Col, Form, FormGroup, Input, Row} from "reactstrap";
import gql from 'graphql-tag';
import { Query } from 'react-apollo';
const EXCHANGE_RATES_QUERY = gql`
{
rates(currency: "USD") {
currency
rate
}
}
`;
class RestaurantForm extends React.Component {
render() {
return (
<Query query={EXCHANGE_RATES_QUERY}>
{({ data }) => {
<>
<div className="content">
<Row>
<Col md="4">
<Card className="card-user">
<div className="image">
<img
alt="..."
src={"assets/paper-dashboard/img/damir-bosnjak.jpg"}
/>
</div>
<CardBody>
<div className="author">
<a href="#pablo" onClick={(e) => e.preventDefault()}>
<img
alt="..."
className="avatar border-gray"
src={"assets/paper-dashboard/img/mike.jpg"}
/>
<h5 className="title">Chet Faker</h5>
</a>
<p className="description">@chetfaker</p>
</div>
<p className="description text-center">
"I like the way you work it <br />
No diggity <br />I wanna bag it up"
</p>
</CardBody>
<CardFooter>
<hr />
<div className="button-container">
<Row>
<Col className="ml-auto" lg="3" md="6" xs="6">
<h5>
12 <br />
<small>Files</small>
</h5>
</Col>
<Col className="ml-auto mr-auto" lg="4" md="6" xs="6">
<h5>
2GB <br />
<small>Used</small>
</h5>
</Col>
<Col className="mr-auto" lg="3">
<h5>
24,6$ <br />
<small>Spent</small>
</h5>
</Col>
</Row>
</div>
</CardFooter>
</Card>
</Col>
<Col md="8">
<Card className="card-user">
<CardHeader>
<CardTitle tag="h5">Edit Profile</CardTitle>
</CardHeader>
<CardBody>
<Form>
<Row>
<Col className="pr-1" md="5">
<FormGroup>
<label>Company (disabled)</label>
<Input
defaultValue="Creative Code Inc."
disabled
placeholder="Company"
type="text"
/>
</FormGroup>
</Col>
<Col className="px-1" md="3">
<FormGroup>
<label>Username</label>
<Input
defaultValue="michael23"
placeholder="Username"
type="text"
/>
</FormGroup>
</Col>
<Col className="pl-1" md="4">
<FormGroup>
<label htmlFor="exampleInputEmail1">
Email address
</label>
<Input placeholder="Email" type="email" />
</FormGroup>
</Col>
</Row>
<Row>
<Col className="pr-1" md="6">
<FormGroup>
<label>First Name</label>
<Input
defaultValue="Chet"
placeholder="Company"
type="text"
/>
</FormGroup>
</Col>
<Col className="pl-1" md="6">
<FormGroup>
<label>Last Name</label>
<Input
defaultValue="Faker"
placeholder="Last Name"
type="text"
/>
</FormGroup>
</Col>
</Row>
<Row>
<Col md="12">
<FormGroup>
<label>Address</label>
<Input
defaultValue="Melbourne, Australia"
placeholder="Home Address"
type="text"
/>
</FormGroup>
</Col>
</Row>
<Row>
<Col className="pr-1" md="4">
<FormGroup>
<label>City</label>
<Input
defaultValue="Melbourne"
placeholder="City"
type="text"
/>
</FormGroup>
</Col>
<Col className="px-1" md="4">
<FormGroup>
<label>Country</label>
<Input
defaultValue="Australia"
placeholder="Country"
type="text"
/>
</FormGroup>
</Col>
<Col className="pl-1" md="4">
<FormGroup>
<label>Postal Code</label>
<Input placeholder="ZIP Code" type="number" />
</FormGroup>
</Col>
</Row>
<Row>
<Col md="12">
<FormGroup>
<label>About Me</label>
<Input
type="textarea"
defaultValue="Oh so, your weak rhyme You doubt I'll bother, reading into it"
/>
</FormGroup>
</Col>
</Row>
<Row>
<div className="update ml-auto mr-auto">
<Button
className="btn-round"
color="primary"
type="submit"
>
Update Profile
</Button>
</div>
</Row>
</Form>
</CardBody>
</Card>
</Col>
</Row>
</div>
</>
}}
{ null }
</Query>
)
}
}
export default RestaurantForm;
当我运行我的应用程序并转到 RestaurantForm 组件页面时，出现以下错误。
app.js:66453 Warning: Failed prop type: Invalid prop `children` of type `array` supplied to `Query`, expected `function`.
in Query (created by RestaurantForm)
in RestaurantForm (created by Context.Consumer)
in Route (created by Dashboard)
in Switch (created by Dashboard)
in div (created by Dashboard)
in div (created by Dashboard)
in Dashboard (created by Context.Consumer)
in Route
in Switch
in ApolloProvider
in Router (created by HashRouter)
in HashRouter
如果我只是在 RestaurantForm 组件中实例化客户端并在 componentDidMount 钩子中查询它，那么事情就是不使用 Query 组件和 ApolloProvider 组件，它正在工作。但我需要使用 ApolloProvider 和 Query 组件。我的代码有什么问题，我该如何解决？
解决方案
上面的Query组件有两个孩子：
- 一个功能：
{({ data }) => {...} - 空值：
{ null }
删除，{ null }以便您只传递一个孩子（函数）来解决错误。
回调也需要返回
{({ data }) => {
return (
//here are your components
)
}}
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