＆＃39; TypeError：解析不是函数＆＃39;什么时候使用gql

Question

我从graphql error教程开始学习graphql和reactjs并修改它。 现在我在尝试调用gql时遇到此错误： {{3}}

这是执行调用的类：

import React from 'react';
import gql from 'graphql-tag';
import { graphql } from 'react-apollo'

class BookForm extends React.Component {

    constructor(props) {
        super(props);
        this.state = {
            title: '',
            author: '',
            src: '',
        };
        this.handleChange = this.handleChange.bind(this);
        this.handleSubmit = this.handleSubmit.bind(this);
    }

    handleChange(event) {
        this.setState({[event.target.name]: event.target.value });
    }

    handleSubmit = (e) => {
        this.props.addBook({
            variables: {
                author: this.state.author,
                title: this.state.title,
                src: this.state.src
            }
        });
    }

    render() {
        return (
            <form className="book__form" onSubmit={this.handleSubmit}>
                <label>
                    Title:
                    <input type="text" name="title" value={this.srtate.title} onChange={this.handleChange} />
                </label>
                <label>
                    Author:
                    <input type="text" name="author" value={this.state.author} onChange={this.handleChange} />
                </label>
                <label>
                Src:
                <input type="text" name="src" value={this.state.src} onChange={this.handleChange}/>
                </label>
                <label>
                    <input type="submit" value="Submit" />
                </label>
            </form>
        );
    }
}


const addBook =  gql `mutation addBook ($author: String!, $title: String!, $: ID!) {
    addBook(author: $author, title: $title, src: $src) {
      id,
      author,
      title,
      src,
    }
  }`

const addBookWithMutation = graphql(addBook)(BookForm);
export default addBookWithMutation;

查询graphql会返回所有数据，但现在当我尝试添加新数据时，我无法获取任何数据。 我在代码中做错了什么，或者这是graphql-tag的问题？

由于