Mongoose exec() does not await properly - node.js

Question

For some reason, exec() is not awaiting in my code:
let team = <SOME TEAM NAME> //putting manually for testing
let results = []
TeamModel.find({ name: team })
.exec(async (err, docs) => {
if (err)
return res.send(Response("failure", "Error occured while retrieving fixtures"))
for(let i = 0; i < docs.length; i++){
let doesExist = await FixtureModel.exists({ leagueName: docs[i].leagueName })
if (doesExist) {
let query = FixtureModel.find({ leagueName: docs[i].leagueName, $or: [{ homeTeam: team }, { awayTeam: team }] })
await query.exec((err2, docs2) => {
if (err2)
return res.send(Response("failure", "Error occured while retrieving fixtures"))
docs2.forEach((doc2, index) => {results.push(doc2.toObject())})
console.log('during await') //Executes second
})
console.log('after await') //Executes first
}
else { //This section is not required
let result = await Communicator.GetFixturesFromLeague(docs[i].leagueId)
result.api.fixtures.forEach((fixture, index) => {
let newFixture = new FixtureModel({
fixtureId: fixture.fixture_id,
leagueId: fixture.league_id,
leagueName: fixture.league.name,
eventDate: fixture.event_date,
statusShort: fixture.statusShort,
homeTeam: fixture.homeTeam.team_name,
awayTeam: fixture.awayTeam.team_name
})
newFixture.save()
results.push(newFixture.toObject())
})
}
}
console.log(results)
res.send(Response("success", "Retrieved fixtures", results))
})
and the result looks something like this:
after await
[]
during await
and therefore an empty array of results is sent before values are added inside. I'm not sure what I'm missing here.

Answer 1

This is a workaround if anyones wondering. Sending the response inside the exec() callback when the forLoop completes bypassing the need for async/await.
if (doesExist) {
let query = FixtureModel.find({ league_name: docs[i].leagueName, $or: [{ homeTeam: { team_name: team} }, { awayTeam: { team_name: team} }] })
await query.exec((err2, docs2) => {
if (err2)
return res.send(Response("failure", "Error occured while retrieving fixtures"))
docs2.forEach((doc2, index) => {results.push(doc2.toObject())})
if(i + 1 == docs.length){
return res.send(Response("success", "Retrieved fixtures", results))
}
})
}