json - Aggregate Method Not Getting Updated Data MongoDB -

So when I do a DELETE request, so I'm updating our model and have been removed from the selected Array items . Then I am sending updated JSON data via AJAX. I am using the overall method to determine the amount of values ​​selected in an array, but the problem is that the overall method is returning data based on the data available, although I put it in the callback. So how do I get the correct update amount? Here's the code I'm doing what I use:

  regUser.findOneAndUpdate ({username: req.user.username}, {$ bridge: {Budget: {uniqueId: parseFloat (req.param ( 'id'))}}}, function (err, data) {if (err) return console.log (err); regUser.aggregate ([{$ match: {username: req.user.username}}, / / unwind the { "$ group": { "$ group": { "_id": "$ _id", "expense": { "Total group with conditions including $ sum {" $ unwind ":" $ budgets " }, ": {" $ cond ": [" $ budgets.expense "," $ budgets.value ", 0]}}," non-Akspens ": {" $ sum ": {" $ cond ": [" $ budgets.expense ", 0," $ budgets.value "]}}}}}, function (err, Agreedeta) {sumData = aggData}); res.json ({sumData: sumData, budgetList: data.budgets}) ;});    
 
 
 async programming found :) Move:  
 < code> res.json ({sumData: sumData, budgetList: data.budgets});   
 Inside the regUser.gregate callback function.  
  function (err, aggData) {res.json ({sumData: aggData, budgetList: data.budgets}); });