Question

每当我尝试访问"ReferenceError: next is not defined"时，我都会遇到/catalog/bookinstance/:id/delete。我花了差不多2个小时试图排除故障，但无济于事:(

关于哪个部分出错的任何建议？

catalog.js

/* GET request to delete BookInstance. */
router.get('/bookinstance/:id/delete', book_instance_controller.bookinstance_delete_get);

// POST request to delete BookInstance
router.post('/bookinstance/:id/delete', book_instance_controller.bookinstance_delete_post);

bookinstanceController.js

var BookInstance = require('../models/bookinstance');
var Book = require('../models/book');

var async = require('async');
// Display BookInstance delete form on GET
exports.bookinstance_delete_get = function(req, res, next) {
    BookInstance.findById(req.params.id)
    .populate('book')
    .exec(function(err, bookinstance){
      if(err){
        return next(err);
      }
      res.render('bookinstance_delete', {title: 'Delete BookInstance', bookinstance: bookinstance})
    });
};

// Handle BookInstance delete on POST
exports.bookinstance_delete_post = function(req, res, next) {
    //req.checkBody('bookid', 'Book ID must exist').notEmpty();
    BookInstance.findByIdAndRemove(req.body.id, function deleteBookInstance(err){
      if(err){
        return next(err);
      }
      res.redirect('/catalog/bookinstances');
    });
};

bookinstance_delete.pug

  h1= title

  p #[strong Do you really want to delete this BookInstance?]

  div(style="margin-left:20px")

    p #[strong ID]: #{bookinstance._id}

    p #[strong Title:] 
      a(href=bookinstance.book.url) #{bookinstance.book.title}

    p #[strong Imprint:] #{bookinstance.imprint}

    p #[strong Status:] 
      if bookinstance.status=='Available'
        span.text-success #{bookinstance.status}
      else if bookinstance.status=='Maintenance'
        span.text-danger #{bookinstance.status}
      else
        span.text-warning #{bookinstance.status} 

    if bookinstance.status!='Available'
      p #[strong Due back:] #{bookinstance.due_back_formatted}

  form(method='POST' action='')
    div.form-group
      input#id.form-control(type='hidden',name='id', required='true', value=bookinstance._id )

    button.btn.btn-primary(type='submit') Delete

bookinstance.js

var mongoose = require('mongoose');
var moment = require('moment');

var Schema = mongoose.Schema;

var BookInstanceSchema = Schema({
  book: {type: Schema.ObjectId, ref: 'Book', required: true},
  imprint: {type: String, required: true},
  status: {type: String, required: true, enum: ['Available', 'Maintenance', 'Loaned', 'Reserved'], default: 'Maintenance'},
  due_back: {type: Date, default: Date.now},
});

BookInstanceSchema
.virtual('url')
.get(function(){
  return '/catalog/bookinstance/' + this._id;
});

BookInstanceSchema
.virtual('due_back_formatted')
.get(function(){
  return moment(this.due_back).format('MMMM Do, YYYY');
});

module.exports = mongoose.model('BookInstance', BookInstanceSchema);

解决“下一个没有定义”

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