Question

我正在努力更新mongoDB中嵌套arrray中的元素。

假设我有这个架构：

var question = new Schema({
  problem: {
    type: String,
    required: true
  },
  multipleChoices: [{
    type: String,
    required: true
  }],
  correctAnswer: {
    type: Number,
    required: true
  }
});

var testCategorySchema = new Schema({
  category: {
    type: String,
    required: true
  },
  tests: [{
    version: {
      type: String,
      required: true
    },
    questions: [question]
  }]
});

例如，我有这样的模式的实例：

{
  category: "Math",
  tests: [
    {
      version: "1A",
      questions: [
         {
           problem: "blablabla",
           multiplechoices: [
            "bla bla", "blb blb", "blc blc"
          ],
           correctAnswer: 1
         },
         {
           problem: "blibliblibli",
           multiplechoices: [
            "bla bla", "blb blb", "blc blc"
          ]
           correctAnswer: 1
         }
      ]
    },
    {
      version: "1B",
      questions: [
         {
           problem: "auauauauau",
           multiplechoices: [
            "bla bla", "blb blb", "blc blc"
          ]
           correctAnswer: 1
         },
         {
           problem: "blibliblibli",
           multiplechoices: [
            "bla bla", "blb blb", "blc blc"
          ]
           correctAnswer: 1
         }
      ]
    }
  ]
}

当测试版本为：1A使用mongooseJS时，如何向数学类别添加新问题？

Answer 1

您需要将update和$push与位置运算符$一起使用：

db.test.update(
    {
        category: 'Math',
        'tests.version': '1A'
    }, 
    {
        $push: {
            'tests.$.questions': { 
                problem: 'test',
                multiplechoices: ['a', 'b', 'c'],
                correctAnswer: 1
            }
        }
    }

Answer 2

试试这个..

  Test.findOne( {category:"Math", tests.version:"1A"}, function(err, result){
   if (!err && result) {
    result.tests.questions.push({"new question"}); //push ur new question 
    var test = new Test(result);  //this is ur mongoose mdel
    test.save(function(err, result2){    //update
        if(!err) {
           console.log(result2); //updated result
        } console.log(err);
    })  

   } else console.log(err);
});

更新嵌套数组mongoose中的元素

2 个答案: