Kolong Kinghu Kolong Kinghu - 4 months ago 17
Node.js Question

Trying to resolve a promise chain from ES6 class functions

So I have this class called Events and I'm trying to call an async function from my server. I'm trying to understand where I went wrong / how to resolve a promise inside another async call. Any hints or tips would be greatly appreciated.

This is the event function I'm calling:

Event.prototype.getCost = function(name_of_place){
return new Promise( function(){
var placeID;
var GooglePlaces = require("node-googleplaces");
const places = new GooglePlaces(API_KEY);
const params = {
location: '40.689247,-123.102192',
radius: 1000
};
var query =
{
query: name_of_place
};
// ASYNC call
places.textSearch(query).then((res) => {
console.log("FIRST ASYNC CALL");
console.log(res.body.results[0].place_id);
placeID = res.body.results[0].place_id;
var request_place_details={
placeid : placeID
};
console.log(request_place_details);

return request_place_details;

}).then((request_place_details) => {
console.log("SECOND ASYNC CALL");
places.details(request_place_details).then((res) => {
console.log(res.body.result.price_level + " S");
var cost = res.body.result.price_level;
//trying to resolve getCost promise
//resolve(this.cost);
return cost;
}).then((cost) => {
console.log("ATTEMPT TO RESOLVE ORIGINAL");
this.cost = cost;
console.log(cost + " F");

//WANT TO RETURN THIS VALUE IN THE END
resolve(this.cost);
});
});
})};


This is where I'm calling it from:

//Server is currently serving on port 8420
app.listen(8420,function startServer(){
console.log("Listening on :: " + 8420);
var Event1 = new events(7,10,'New York');
// console.log(Event1.getCost('Sushi'));
Event1.getCost('Sushi').then(res => {
console.log(res);
})
});

Answer

your whole structure is way to complicated. when stripping the comments, you can reduce the code to this:

Event.prototype.getCost = function(name_of_place){
    var GooglePlaces = require("node-googleplaces");
    const places = new GooglePlaces(API_KEY);
    //const params = {
    //  location: '40.689247,-123.102192',
    //  radius: 1000
    //};

    return places.textSearch({ query: name_of_place })
        .then(res => res.body.results[0].place_id)
        .then(placeID => places.details({ placeid : placeID }))
        .then(res => res.body.result.price_level)
}