How to print nested array using mongo query - mongodb

Question

I'm trying to print the values of an nested array.But getting execute script error.How do I print object BSON and avoid error in for nested array.
Note : I want to do with print and not find().
Customer schema
{
"name" : "Sam",
"phone" : [
{
"home" : "123456",
"work" : "045842"
}]}
query
db.getCollection('customer').find({}).forEach( function(cust)
{
print("Customer Name : " + cust.name); // prints Sam
print("Home Contact : " + cust.phone) // prints [object BSON]
print("Home Contact : " + cust.phone.home) // throws error
});

Answer 1

You could use aggregation if there are multiple items in the array
db.collectionName.aggregate([
{ $unwind: { path: "$phone", preserveNullAndEmptyArrays: true}},
]).forEach(function(doc){
print(doc.name)
if(doc.phone !== undefined) print(doc.phone.home)
if(doc.phone !== undefined) print(doc.phone.work)
})

Answer 2

You just need to convert the object to string and access the array;
print("Home Contact : " + JSON.stringify(cust.phone[0]))
// prints ` Home Contact: { "home" : "123456", "work" : "045842" }
print("Home Contact : " + cust.phone[0].home) // "123456"
An example:
aireclaimRs:PRIMARY> use test
switched to db test
aireclaimRs:PRIMARY> db.createCollection('customer')
{ "ok" : 1 }
aireclaimRs:PRIMARY> db.customer.insert( {
... "name" : "Sam",
... "phone" : [
... {
... "home" : "123456",
... "work" : "045842"
... }]})
WriteResult({ "nInserted" : 1 })
aireclaimRs:PRIMARY> db.getCollection('customer').find().forEach(function(cust){
... print("Customer Name : " + cust.name);
... print("Homes Contact : " + JSON.stringify(cust.phone[0]));
... print("Home Contact : " + cust.phone[0].home)
... })
Customer Name : Sam
Homes Contact : {"home":"123456","work":"045842"}
Home Contact : 123456