如何查詢數組中的ID？ 貓鼬

Question

如何使用貓鼬查詢數組中的特定_id

這是代碼

var userSchema = new mongoose.Schema({
   resume: {
      educations: [{
          school: String,
          year: String
      }]
   }
});

如何特別查詢教育ID？

我的嘗試

User.findById({ 'resume.educations._id': req.body.education_id}, function(err, foundUser){

   console.log(foundUser) --> Keep returning Undefined
});

已存儲的數據

console.log(req.body.education_id) -> 5644318364acb9f1eb25c939

Answer 1

您可以將$ elementMatch與findOne一起使用，如下所示

User.findOne({'resume.educations': {$elemMatch: {_id: '564497eb366f59b004e9d17e'}}}, function(err, foundUser){

   console.log(foundUser);
   // output
   // [ { resume: { educations: [ [Object] ] },
   //   __v: 0,
   //   _id: 564497eb366f59b004e9d17d } ]

});

這是我嘗試過的文件，它起作用了

{
        "_id" : ObjectId("564497eb366f59b004e9d17d"),
        "resume" : {
                "educations" : [
                        {
                                "school" : "school name",
                                "year" : "1999",
                                "_id" : ObjectId("564497eb366f59b004e9d17e")
                        }
                ]
        },
        "__v" : 0
}