Mongoose: value from Model - node.js

Question

I have the following model:
var requestSchema = new Schema({
description: { type: String, required: true },
country: { type: String, index: true },
shipping: [shipping],
deliveryLoc: { type: String, index: true },
price: { type: Number, default: 0 },
})
I now want to get the price using mongoose and I am not sure which command I have to use.
I tried:
var pricy = _.first(_.where(request.price));
and it does not work, I get undefined even through through other queries in the same file I can get "shipping".
Getting the shipping type works with the following command:
var shipping = _.first(_.where(request.shipping, { type: shippingType }));
Am I using the wrong command?

Answer 1

You should be able to use the select method as follows:
// find a request
var query = Request.findOne();
// selecting the `price` field
query.select('price');
// execute the query at a later time
query.exec(function (err, request) {
if (err) return handleError(err);
console.log('The price is $%s.', person.price) // The price is $6.92
});
or if passing a callback:
var Request = mongoose.model('Request', requestSchema);
// find each request with a country matching 'Zimbabwe', selecting the `price` field
Request.findOne({ 'country': 'Zimbabwe' }, 'price', function (err, request) {
if (err) return handleError(err);
console.log('The price is $%s.', request.price) // The price is $6.92.
});

Answer 2

First, you need to create your schema like that:
var items = new Schema({
description: { type: String, required: true },
country: { type: String, index: true },
shipping: [shipping],
deliveryLoc: { type: String, index: true },
price: { type: Number, default: 0 },
});
After that you need to compile the new schema and add it to the database:
items = mongoose.model("Items", items); // The table name will be "Items"
When the model is created, you can execute your query (find or findOne):
items.findOne({price: request.price}, function (error, item) {
if (error) {
console.log(error);
} else {
console.log(item);
}
});
The full code:
var mongoose, Schema;
mongoose = require("mongoose");
Schema = mongoose.Schema;
var items = new Schema({
description: { type: String, required: true },
country: { type: String, index: true },
shipping: [shipping],
deliveryLoc: { type: String, index: true },
price: { type: Number, default: 0 },
});
items = mongoose.model("Items", items);
items.findOne({price: request.price}, function (error, item) {
if (error) {
console.log(error);
} else {
console.log(item);
}
});