FirebaseAppImpl。（匿名函数）[作为数据库]我该怎么办类型错误

Question

此代码给出TypeError：无法读取未定义的属性“ bind” FirebaseAppImpl。（匿名函数）[作为数据库] 在线错误  this.databaseref = 看起来像是来自火力发源地

从'react'导入React，{Component}; 从“ ../../PostEditor/components/PostEditor”导入PostEditor；

import Post from '../../Post/component/Post';
export default class ThreadDisplay extends Component{

  constructor(props) {
        super(props);
        this.databaseRef = this.props.database().ref().child('posts');
        this.addPost = this.addPost.bind(this);
        this.updateLocalState = this.updateLocalState.bind(this);

        this.state = {
      posts:[],

    }
  }
componentWillMount() {
  const{updateLocalState}=this;
  this.databaseRef.on('child_added', snapshot => {
  const response = snapshot.val();
  updateLocalState(response);
  });

}


  addPost(postBody) {
  const postToSave = {postBody};
  this.databaseRef.push().set(postToSave);


  }


updateLocalState(response)
{
  const posts = this.state.posts;
  const brokenDownPost= response.postBody.split(/[\r\n]/g);
  posts.push(brokenDownPost);
  this.setState({
  posts: posts,
  })
}
render() {
return(
<div>
         {
            this.state.posts.map((postBody, idx) => {
       return (
             <Post  key={idx} postBody={postBody} />
              )
            })
         }
       <PostEditor addPost={this.addPost} />
      </div>

);

}
}