content: import React, { Component } from 'react';
  import { connect } from 'react-redux';
  import { Link } from 'react-router-dom';
  
  import { fetchPost, deletePost } from '../actions';
  
  
  class PostsShow extends React.Component {
    componentDidMount(){
      //optional to leave out for stale data vs network usage concerns
      if (!this.props.post){
        const { id } = this.props.match.params;
        this.props.fetchPost(id);
     }
    }
    onDeleteClick(){
      const { id } = this.props.match.params;
      this.props.deletePost(id, ()=> {
        this.props.history.push('/');
      });
    }
    render(){
      const { post } = this.props;
  
      if (!post){
        return <div>Loading...</div>;
      }
      return(
        <div>
          <Link to="/" className="btn btn-primary">Back to Index</Link>
          <button
            className="btn btn-danger pull-xs-right"
            onClick={this.onDeleteClick.bind(this)}
          >
            Delete Post
          </button>
          <h3>{post.title}</h3>
          <h6>Categories: {post.categories}</h6>
          <p>{post.content}</p>
        </div>
      );
    }
  }
  
  function mapStateToProps( { posts }, ownProps ){
    return {post: posts[ownProps.match.params.id] };
  }
  
  export default connect(mapStateToProps, { fetchPost, deletePost })(PostsShow);
  