How to use for loop in mongoose find function?

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Here is my code:

app.post('/update', async (req, res, done) => {
  let drive = req.app.get('drive');
  let fileId = req.body.id;
  let subject = req.body.subject;
  let grade = req.body.grade;
  let industry = req.body.industry;
  await TagFile.findOne({id: fileId}, (err, res) => {
    if (err) return console.log(err);
    //console.log(res);
    //console.log(subject);
    takeRes(res);
  })
  function takeRes(res) {
    for (let i = 0; i > subject.length; i++) {
      if(!res[0].subject.includes(subject[i])) {
        res[0].subject.push(subject[i]);
        console.log(res[0].subject)
        console.log("first was called")
      }
      else {
        console.log(res[0].subject)
        console.log("else was called.")
      }      
    }
  }
})

This is a post request that is made from my site. When it gets to the step where the for loop needs to be used, I don’t get anything in the console from the if else statements. I know this probably has something to do with async, but I don’t fully understand it, and would love a push in the right direction. Thank you!

221 thoughts on “How to use for loop in mongoose find function?”

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