React-Apollo:从组件状态动态更新GraphQL查询

创建一个新组件,该组件将具有 prop 忙碌的

这一过程在 react-apollo 第节中的文档: Computing from props

演示: https://codesandbox.io/embed/PNnjBPmV2

Data.js

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

const Data = ({ data }) =>
  <div>
    <h2>Data</h2>
    <pre style={{ textAlign: 'left' }}>
      {JSON.stringify(data, undefined, 2)}
    </pre>
  </div>;

Data.propTypes = {
  active: PropTypes.bool.isRequired,
};

const query = gql`
  query SearchAuthor($id: Int!) {
    author(id: $id) {
      id
      firstName
      lastName
    }
  }
`;

export default graphql(query, {
  options(ownProps) {
    return {
      variables: {
        // This is the place where you can 
        // access your component's props and provide
        // variables for your query
        id: ownProps.active ? 1 : 2,
      },
    };
  },
})(Data);

App.js

import React, { Component } from 'react';
import Data from './Data';

class App extends Component {
  constructor(props) {
    super(props);

    this.state = {
      active: false,
    };

    this.handleChange = this.handleChange.bind(this);
  }

  handleChange() {
    this.setState(prevState => ({
      active: !prevState.active,
    }));
  }

  render() {
    const { active } = this.state;

    return (
      <div>
        <h1>App</h1>
        <div>
          <label>
            <input
              type="checkbox"
              checked={active}
              onChange={this.handleChange}
            />
            If selected, fetch author <strong>id: 1</strong>
          </label>
        </div>
        <Data active={active} />
      </div>
    );
  }
}

export default App;