todo-app-with-db-1.js

class TodoApp extends React.Component {

  constructor({db}) {
    super();
    this.db = db;
    this.state = {
      todos: [],
      text: '',
    }
  }

  async componentWillMount() {
    const todos = await this.db.collection('todos').find({}).sort({_id: -1}).toArray();
    this.setState({
      todos
    });
  }

  onSubmit = async (e) => {
    e.preventDefault();
    await this.db.collection('todos').insert({text: this.state.text});
    this.setState({
      todos: await this.db.collection('todos').find({}).sort({_id: -1}).toArray(),
      text: ''
    });
  }

  render() {
    return (
      <div>
        <form onSubmit={this.onSubmit}>
          <input value={this.state.text} onChange={(e) => this.setState({text: e.target.value})} type='text'/>
          <button type='submit'>Add Todo</button>
        </form>
        <ul>
          {this.state.todos.map((todo) => {
            return <li key={todo._id}>{todo.text}</li>
          })}
        </ul>
      </div>
    )
  }
}