不从react-apollo导出的撰写 [英] compose not exported from react-apollo

问题描述

我正在关注youtube上的graphql教程( https://www.youtube.com/观看?v = ed8SzALpx1Q 大约在3小时16分左右)，其中一部分使用"react-apollo"中的 compose .但是，我收到了错误消息，因为新版本的react-apollo不会导出此消息.

I'm following a graphql tutorial on youtube (https://www.youtube.com/watch?v=ed8SzALpx1Q at about 3hr 16min) and part of it uses compose from "react-apollo". However, I'm getting an error because the new version of react-apollo does not export this.

我在网上阅读到我需要将"react-apollo"中的 import {compose} 替换为"recompose"中的 import {compose} ，但是这样做会产生错误 TypeError:无法读取未定义的属性'loading' ，我还读到我应该用 import *替换来自react-apollo的import，作为"lodash"的组成，但是当我这样做是因为我收到其他错误，说×TypeError:lodash__WEBPACK_IMPORTED_MODULE_2 __(...)不是函数

I read online that I need to replace import { compose } from "react-apollo" with import { compose } from "recompose" but doing that produces the error TypeError: Cannot read property 'loading' of undefined I've also read that I should replace the import from react-apollo with import * as compose from "lodash" but when I do this I get other errors, saying that × TypeError: lodash__WEBPACK_IMPORTED_MODULE_2__(...) is not a function

App.js:

import React from "react";
import ApolloClient from "apollo-boost";
import { ApolloProvider } from "react-apollo";

import BookList from "./components/BookList";
import AddBook from "./components/AddBook";

//apollo client setup
const client = new ApolloClient({
  uri: "http://localhost:4000/graphql"
});

function App() {
  return (
    <ApolloProvider client={client}>
      <div className="main">
        <h1>My Reading List</h1>
        <BookList />
        <AddBook />
      </div>
    </ApolloProvider>
  );
}

export default App;

queries.js:

queries.js:

import { gql } from "apollo-boost";

const getBooksQuery = gql`
  {
    books {
      name
      id
    }
  }
`;

const getAuthorsQuery = gql`
  {
    authors {
      name
      id
    }
  }
`;

const addBookMutation = gql`
  mutation {
    addBook(name: "", genre: "", authorId: "") {
      name
      id
    }
  }
`;

export { getAuthorsQuery, getBooksQuery, addBookMutation };

AddBooks.js:

AddBooks.js:

import React, { Component } from "react";
import { graphql } from "react-apollo";
import { compose } from "recompose";
// import * as compose from "lodash";
import { getAuthorsQuery, addBookMutation } from "../queries/queries";

class AddBook extends Component {
  state = {
    name: "",
    genre: "",
    authorId: ""
  };

  displayAuthors = () => {
    let data = this.props.data;
    if (data.loading) {
      return <option>loading authors...</option>;
    } else {
      return data.authors.map(author => {
        return (
          <option key={author.id} value={author.id}>
            {author.name}
          </option>
        );
      });
    }
  };

  submitForm(e) {
    e.preventDefault();
    console.log(this.state);
  }

  render() {
    return (
      <form onSubmit={this.submitForm.bind(this)}>
        <div className="field">
          <label>Book name: </label>
          <input
            type="text"
            onChange={e => {
              this.setState({ name: e.target.value });
            }}
          />
        </div>
        <div className="field">
          <label>Genre: </label>
          <input
            type="text"
            onChange={e => {
              this.setState({ genre: e.target.value });
            }}
          />
        </div>
        <div className="field">
          <label>Author: </label>
          <select
            onChange={e => {
              this.setState({ authorId: e.target.value });
            }}
          >
            <option>Select author</option>
            {this.displayAuthors()}
          </select>
        </div>
        <button>+</button>
      </form>
    );
  }
}

export default compose(
  graphql(getAuthorsQuery, { name: "getAuthorsQuery" }),
  graphql(addBookMutation, { name: "addBookMutation" })
)(AddBook);

我希望可以从react-apollo导入compose并接受查询和变异，并使它们在AddBook的props中可用，因此我可以在displayAuthors()和SubmitForm()函数中使用它们，但我却得到了它不是从react-apollo导出的错误，当我尝试建议的解决方案时，我在网上发现了上面提到的其他错误.

I expected compose to be imported from react-apollo and to take the query and mutation and make them available inside of AddBook's props, so I can use them in the displayAuthors() and submitForm() funtions, but instead I get the error that it is not exported from react-apollo, and when I try the suggested solutions I found online I get the other errors mentioned above.

推荐答案

在客户文件夹中安装lodash

Install lodash in your client folder

npm install lodash 

并使用它从lodash导入compose(在flowRight中使用大写字母R)

and use this to import compose from lodash (use a capital R in flowRight)

import {flowRight as compose} from 'lodash';

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