reactjs - React Apollo 客户端查询抛出错误 "Invalid prop ` children` of type `array` supplied to `Query`, expected `function` "

Question

我正在做一个 React JS 项目。我的应用程序需要使用 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 组件的客户端属性。

我有一个名为 RestaurantForm 的组件，它使用如下 GraphQL 查询组件。

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 Hook 中查询它，问题是没有使用 Query 组件和 ApolloProvider 组件，它正在工作。但是我需要使用 ApolloProvider 和 Query 组件。我的代码有什么问题，我该如何解决？

Answer 1

上面的 Query 组件有两个子组件:

1. 一个函数:{({ data }) => {...}
2. 空:{ null }

删除 { null } 以便您只传递一个子项(函数)来解决错误。

回调也需要返回

{({ data }) => {
    return (
      //here are your components
    )
}}