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mysqlnode.jsrestloopbackjs

How to fix the callback was already called in loopback model

I have tried to extend api in loopback model. In the model, I used standard api of model such as findOne, create. The example codes are below

Subscriber.findOne({
 where : {
      email : "............."
 },
 function(err, instance){
      if(instance)
      {
           cb(null,instance);
           response = "success";
      }
 }
 cb(null, response);

But when I called this extended api, the error was occurred.

throw err:// Rethron non-MsSQL errors
    ^

Error: Callback was already called.

How to fix this error?

Solution

  • You need to use return inside the if callback as you haven't used else statement. Change your code to:

    Subscriber.findOne({
  where: {
    email: "............."
  },
  function(err, instance) {
    if (instance) {
      response = "success";
      return cb(null, instance);
    }
  },
  return cb(null, response);
});