firebase_denormalization_handler.js

  firebase.database().ref('transactions/').push(data).then(function(res){ // PUSH 1
          firebase.database().ref('users/' + user.uid + '/transactions/' + res.key).set({dtCreated: data.dtCreated}).then(
              function(res2){ // AFTER PUSH 2
                  console.log("Gravou nos 2");
                  window.location.href = "#/dashboard/history";
              }, function(err2) {
                  var error = {
                      canceled: true,
                      log: "transaction not registered in owner attributes."
                  };
                  // WORKAROUND IF ERROR
                  firebase.database().ref('transactions/' + res.key).update(error).then(function(resRemoved){
                      console.log("removido!" + resRemoved);
                  });
                  toast.message = "Problemas ao gravar sua transação";
                  tpl.toastOn();
              }
          );
      }, function(err) {
          console.log(err);
          toast.message = "Problema ao gravar a transação";
          tpl.toastOn();
      }
  );