Async call in angular 6 API

Question

I did below code in my API file but I don't understand how to manage below two async calls to execute the function in order can someone help me to resolve the issue or can I use promise to solve the issue.

Thanks in advance for the help.

function getDataFromBK() {
  connection((db) => {

    var comment = "";
    db.collection('comment')
      .find({
        "appNo": appNo
      }, {
        "filename": fileName
      })
      .toArray()
      .then((filelist) => {
        /* response.data = filelist;
         res.json(response);*/

        comment = filelist[0].comment;
        console.log("comment-->" + comment);

        return comment;
      }).catch((err) => {
        console.log("err-->" + err);

        return err;
      })
  });


  filepath = path.join(__dirname, '../../uploads/output/' + req.body.appNo) + '/' + req.body.filename[i];
  fileInfo.push({
    "originalName": req.body.filename[i],
    //"size": req.body.filename.size,
    "b64": new Buffer(fs.readFileSync(filepath)).toString("base64"),
    "comment": comment
  });
}

I want to use both calls in one function & the response of the first call I want to use in the second call. — Pramod
– Pramod, Commented Oct 5, 2018 at 6:47

Pramod · Accepted Answer · 2018-10-05 17:50:58Z

1

Since comment is set inside then, you can't expect it to be available where you're doing fileInfo.push as the find operation is going to be async in nature.

Try restructuring your code like this:

function getDataFromBK() {
  connection((db) => {

    var comment = "";

    db.collection('comment')
      .find({ "appNo": appNo }, { "filename": fileName })
      .toArray()
      .then(filelist => {

        comment = filelist[0].comment;

        filepath = path.join(__dirname, '../../uploads/output/' + req.body.appNo) + '/' + req.body.filename[i];
        fileInfo.push({
          "originalName": req.body.filename[i],
          "b64": new Buffer(fs.readFileSync(filepath)).toString("base64"),
          "comment": comment
        });



      })
      .catch(err => err)
  });
}

edited Oct 5, 2018 at 17:50

Pramod

4343 gold badges7 silver badges28 bronze badges

answered Oct 5, 2018 at 7:04

SiddAjmera

39.6k7 gold badges78 silver badges114 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Async call in angular 6 API

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related