Query on array of array object in mongodb - arrays

Question

Following is my product collection in mongodb..
{
"_id" : ObjectId("56d42389db70393cd9f47c22"),
"sku" : "KNITCHURI-BLACK",
"options" : [
{
"sku" : "KNITCHURI-BLACK-M",
"stores" : [
{
"code" : "6",
"quantity" : 0
},
{
"code" : "10",
"quantity" : 26
}
],
"ean_code" : "2709502",
"size" : "M"
},
{
"sku" : "KNITCHURI-BLACK-S"
"stores" : [
{
"code" : "6",
"quantity" : 0
},
{
"code" : "10",
"quantity" : 30
}
],
"size" : "S"
}
]
}
want query on where { 'options.stores.code' : '6' } and { 'options.stores.quantity' : { $gt : 0 } }, How i query on this collection then i got response? Kindly help on this issue..

Answer 1

Here is the two approaches to get documents in Mongoose.
You can change the Mongo query if required as given in the various answers. I have just used your approach for Mongo query.
Approach 1 - Using cursor - Recommended Approach
Approach 2 - Using Query
var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/test');
var Schema = mongoose.Schema, ObjectId = Schema.ObjectId;
var Store = new Schema({
code : String,
quantity : Number
});
var Option = new Schema({
sku : String,
stores : [ Store ],
ean_code : String,
size : String
});
var productSchema = new Schema({
_id : ObjectId,
sku : String,
options : [ Option ]
});
var Product = mongoose.model('product', productSchema, 'product');
console.log("Cursor Approach #1");
var cursor = Product.find({
'options.stores' : {
$elemMatch : {
code : '6',
quantity : {
$gt : 0
}
}
}
}).cursor();
console.log("Curosr Results***************************************");
cursor.on('data', function(doc) {
console.log("Getting doc using cursor ==========>" + JSON.stringify(doc));
});
cursor.on('close', function() {
console.log("close the cursor");
});
console.log("Query Approach #2");
var query = Product.find({
'options.stores' : {
$elemMatch : {
code : '6',
quantity : {
$gt : 0
}
}
}
});
console.log("Query Results***************************************");
query.exec(function(err, doc) {
if (err) {
console.log(err);
}
console.log("Getting doc using query ==========>" + JSON.stringify(doc));
});

Answer 2

I think you need to unwind options
db.product.aggregate( [
{ $unwind: "$options" }
{ $match: { 'options.stores.code' : '6','options.stores.quantity' : { $gt : 0 }}
] )

Answer 3

As far as I understand the question, you want to find a products that are in stock in stores with code 6. The following query does that:
db.collection.find({"options.stores" : {$elemMatch: {"code" : "6", "quantity" : {$gt : 0}}}});