Mongoose模型的save()不会更新空数组

时间:2017-09-08 12:10:28

标签: arrays mongodb mongoose model save

我在Mongoose模型中有一个数组(bookedby),如下所示:

var mongoose = require('mongoose');
var Schema = mongoose.Schema;

    var BarSchema = new Schema({
      date: {
        type: Date,
        required: true
      },
      barid: {
        type: String,
        required: true
      },
      bookedby: {
        type: [String],
        required: true
      },
    });

    module.exports = mongoose.model('Bar', BarSchema);

我用以下函数更新它,由nodejs express router调用:

const Bars = require("../../models/bars");
const { getToday } = require('../../utils');

module.exports = function(req, res) {
  const { barid } = req.body;
  const { username } = req.user;
  const date = getToday();

  if( !barid ) return res.json({ success: false, error: 'Please specify parameter \'barid\'.'})

  Bars.findOne({ barid, date }, function (err, bar) {
    if (err) return next(err);

    if (!bar || bar.bookedby.indexOf(username) === -1) return res.json({ error: `Bar is not booked yet.` });

    // Someone booked the bar
    const index = bar.bookedby.indexOf(username);
    bar.bookedby.splice(index, 1);
    bar.save(err => {
      if (err) res.json({ error: `Error saving booking.` });
      else res.json({ success: true });
    });
  });
};

除非我从bookedby数组中删除最后一项,否则一切正常。然后save()函数不更新数据库。最后一项仍然存在。我想这与mongodb优化空数组有关,但我该如何解决呢?

1 个答案:

答案 0 :(得分:0)

根据猫鼬常见问题解答: http://mongoosejs.com/docs/faq.html

对于版本> = 3.2.0,您应该使用array.set()语法:

doc.array.set(3, 'changed');
doc.save();

如果您运行的版本低于3.2.0,则必须在保存之前标记修改的数组:

doc.array[3] = 'changed';
doc.markModified('array');
doc.save();