无法更新mongoose模型 [英] Unable to update mongoose model

问题描述

我有一个令人困惑的奇怪问题。我有一个模型：

I have a weird issue that is baffling me. I have a model:

var Model = new Schema({
    name: String,
    variations: Array
});

变体条目如下所示：

[ {code: '', price: '' }, {code: '', price: '' }]

我需要添加一个新字段 - 比如color。所以我这样做是批量更新：

I need to add a new field - say "color". So I am doing this to batch update:

Model.find().exec(function(err, products) {
    if (!err) {
        products.forEach(function(p) {
            for(var i = p.variations.length - 1; i >= 0; i--) {
                p.variations[i]['color'] = 'red';
                // This shows all existing variations 
                // with the new color feed - correct
                console.log(p.variations[i]);
            }
            p.save(function(err) {
                if (!err) {
                    console.log("Success");
                } else {
                    console.log(err);
                }
            });
        });     
    }
});

然而，颜色字段未设置 - 如果我再次检查并注释掉 p.variations [i] ['color'] ='red'; 行然后它不会显示。我似乎无法弄清楚为什么这样做。我有一个正确触发的onSave事件，所以它正在保存。我也没有检查变体结构 - 即没有代码只允许代码和价格。我显然遗漏了一些东西，但几个小时后我就没想完了。

However the "color" field is not set - if I go through again and comment out the p.variations[i]['color'] = 'red'; line then it does not show. I can't seem to figure out why it's doing this. I have an onSave event that is triggered correctly so it's saving. I also do not have any check on the variations structure - i.e. there is no code that only allows code and price. I'm obviously missing something but after a couple of hours I ran out of ideas.

推荐答案

修改内容时无类型数组字段，如变种，您需要通过调用<$ c $通知Mongoose您已更改其值c>修改后的文档上的markModified（路径）或后续的 save（）调用将不会保存它。 查看文档。

When you modify the contents of an untyped Array field like variations, you need to notify Mongoose that you've changed its value by calling markModified(path) on the modified document or a subsequent save() call won't save it. See docs.

  for(var i = p.variations.length - 1; i >=0; i--) {
    p.variations[i]['color'] = 'red';
  }
  p.markModified('variations');
  p.save(function(err) { ...

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