如何使用nodejs中的service in function在mongodb中将boolean变量设置为true

Question

I have created a function in service using nodejs to set the boolean variable to true upon button click. But its not working.

I'm using get method in service to do the above. // in html

<tr *ngFor="let status of bookstatus">
              <td>{{status.bookname}}</td>
              <td>{{status.issuedate | date:'dd/MM/yyyy'}}</td>
              <td>{{status.returndate}}</td>
              <td>{{status.membername}}</td>
              <td>{{status.fine}}</td>
              <td>{{status.status}}</td>
              <td><button type="button" (click)="returnbook(status._id)">BookReturn</button></td>
              </tr>

// in ts

returnbook(id: number) {
   this.bookissueservice.returnbook(id).subscribe(response => {window.alert('book returned'); });

   if (this.bookstatus.isreturned === true) {
  this.bookstatus.status = 'returned';
  var date1 = new Date(this.bookreturn);
  var date2 = new Date(this.bookstatus.returndate);
  var timeDiff = Math.abs(date2.getTime() - date1.getTime());
  var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24));
  if (diffDays !== 0) {
    const res = 50;
    this.fine = res + diffDays;
  }
  else {this.fine = 0; }
}
 }

//in service

returnbook(id:number){
  return this.http.get(`http://localhost:4000/api/memberdetails/${id}`).
    pipe(map(response=>response));
}

//in api

router.get('/return/:id?',(req,res)=>{
                var body=req.params.id;
                var id=body.id;
                bookissue.findById(id,(error,bookissue)=>{if(error){
                    console.log(error);}  
              /*bookissue.isreturned is the boolean variable which I'm trying to set to true on button click */
                bookissue.isreturned = 1;
                bookissue.save(function(error,returned){
                    if(error){
                        console.log(error);
                        return next(error);
                    }
                    res.json({status:true,message:'saved',data:returned});

                });
            });
        });

Answer 1

If you wanna save the boolean variable to "1" use the update query.

bookissue.update({_id:id},{$set:{isreturned:true}},(error,result)=>{
if(error){
      console.log(error);
      return next(error);
 }
 console.log("result : ",result);
 res.json({status:true,message:'saved',data:result});
 });