Document method

18 Document Method

var stu=new StuModel({
    
    name:" Rush to bully ",
    age:48,
    gender:"male"
});
console.log(stu);

stu.save(function (err){
    
    if(!err){
    
        console.log(" Saved successfully ");
    }
});

StuModel.findOne({
    },function (err,doc){
    
    doc.update({
    $set:{
    age:27}},function (err){
    
        if(!err){
    
            console.log(" Modification successful ";)
        }
    })
});

StuModel.findOne({
    },function (err,doc){
    
    doc.age=18;
    doc.save();
});

Delete

StuModel.findOne({
    },function (err,doc){
    
    doc.remove(function (err){
    
        if(!err){
    
            console.log(" Goodbye, elder martial brother ");
        }
    })
});

obtain

doc.get("age");
// Or more succinct 
doc.age;

Set the specified attribute value of the document

doc.set("name","xai");

 Database is not affected ,
doc.name="hhh";

Get document underline id

doc.id

toJson/toObject

 Turn into json object , Pay attention to all document Object methods cannot be used 
var j=doc.toJson();
 Turn to object 

doc=doc.toObject();
delete doc.address;