CODEWITHSUNDEEP
node.jsexpressmongoosepromiseasync.js
mtths
mtths

Reputation: 53

Mongoose : using promises as parameters for other functions

I am trying to get a good understanding of how to work with promises, mostly because I want to query data and then use that data to query other data

I have this Schema :

var serviceSchema = new Schema({
name: String,
});

And this method on it :

serviceSchema.statics.getIdByName = function getIdByName (serviceName) {

this.findOne({name :serviceName }).exec(function(err, service){
    if(err) console.log(err)

    return service._id

})
}

In my code I would like to do something like :

var service_id = Service.getIdByName("facebook")
otherSchema.findOne({service : service_id}).exec(...)

but service_id is a promise so the query isn't right, I don't want to be in callback hell and calling models inside of callbacks etc I have tried async with something like

async.series([getVariables], function(err, results){
otherSchema.findOne({service : service_id}).exec(...)})

Where getVariables is :

function getVariables(callback1) {
if(service_id!=undefined) {
    callback1(serviceID)
}}

Any help on how to achieve this is more than welcome! thanks a lot

Upvotes: 2

Views: 111

Answers (2)

mtths
mtths

Reputation: 53

The answer to this is actually using async/await and and do var x = await Model.findOne().exec()

or any function that returns a promise, then you can use x anywhere in the code

Upvotes: 0

Rahul Sharma
Rahul Sharma

Reputation: 10071

try this exec() returns promise.

serviceSchema.statics.getIdByName = function getIdByName(serviceName) {
    return this.findOne({
        name: serviceName
    }).exec();
}

Call getIdByName function

Service.getIdByName("facebook").then((data) => {
    console.log(data)
})

Upvotes: 2

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