Question

我正在尝试更新元素。

//模式

var SurveySchema = new Schema({
    id: String,
    form: [{
            sections: [ // each section's a page
                {
                    name: String,
                    description: String,
                    input: {
                        _type: String,
                        contents: [
                            {
                                _id: false,
                                "text": String,
                                "value": String
                            }
                        ]
                    }
                }
            ]
        }]
});

//我的Json

{
    "_id": "58fe27e0e340671c9859c995",
    "__v": 0,
    "form": [
    {
        "_id": "58fe2b1de437791cd02b9a8c",
        "sections": [
            {
                "_id": "58fe2b1de437791cd02b9a8d",
                "input": {
                    "_type": "radio"
                }
            }
        ]
    },
    {
        "_id": "58fe2ca32470711c586d6b6e",
        "sections": []
    }
    ]
}

//更新

var save = function(req, res) {
    var survey = {};
    survey.id = req.params.surveyId; // 58fe27e0e340671c9859c995
    survey.form_id = req.params.formId; // 58fe2b1de437791cd02b9a8c

    Survey.update(
        { _id: survey.id, // 58fe27e0e340671c9859c995
          'form._id': survey.form_id // 58fe2b1de437791cd02b9a8c
         },  
        {'$set': {
           'form.$.sections.$.input._type': 'checkbox'
        }},
        {safe: true, upsert: true},
        function(err, model) {
            if (err)
                res.send(err);
            res.json(model);
        }
    );
};

我想更改input._type以获取新值'checkbox'的ID：_id: 58fe2b1de437791cd02b9a8c，但我一直收到此错误消息："Too many positional (i.e. '$') elements found in path 'form.$.sections.$.input._type'"并且应用崩溃了

Answer 1

对于您拥有的每个不同类型的元素（部分，输入），您应该有不同的模式

试一试：

const surveySchema = new Schema({
  name: String,
  sections: [
    {
      type: Schema.Types.ObjectId,
      ref: 'Section'
    }
  ]
});

const sectionSchema = new Schema({
  name: String,
  description: String,
  contents: [
    {
      type: Schema.Types.ObjectId,
      ref: 'Input'
    }
  ]
});

const inputSchema = new Schema({
  text: String,
  value: String,
  _type: String
});

const Input = mongoose.model('Input', inputSchema);
const Section = mongoose.model('Section', sectionSchema);
const Survey = mongoose.model('Survey', surveySchema);

然后更新它

Input.update({ _id: id }, { $set: { _type: 'checkbox' }});

您可以在Mongoose架构this

上找到更多信息

您可以找到有关Mongoose关系的更多信息here

尝试更新时位置太多（即＆＃39; $＆＃39;）

1 个答案: