Update Array Fields - mongodb

Question

I have a Document Structure as shown below
let's say for a tree structure like ORDERS.MAIN_ORDERS.P1, this ;basically created 3 document showing parents for each node
{
"_id" : ObjectId("5362a7fd300400ffbabc3754"),
"categoryid" : "ORDERS",
"ancestors" : [],
"availableLocales" : [
{
"locale" : "en_US",
"count" : 1
}
],
"rolledUpCount" : 1
}
{
"_id" : ObjectId("5362a7fd300400ffbabc3755"),
"categoryid" : "MAIN_ORDERS",
"ancestors" : [
"ORDERS"
],
"availableLocales" : [
{
"locale" : "en_US",
"count" : 1
}
],
"rolledUpCount" : 1
}
{
"_id" : ObjectId("5362a7fd300400ffbabc3756"),
"categoryid" : "P1",
"ancestors" : [
"ORDERS",
"MAIN_ORDERS"
],
"availableLocales" : [
{
"locale" : "en_US",
"count" : 1
}
],
"rolledUpCount" : 1
}
When a new tree comes in(e;g ORDERS.MAIN_ORDERS.P2) i need to increment the count of all the parents for that categoryid( P2) for that particular locale. how do i do that with mongoQuery?

Answer 1

You can try to update using the following:
db.mycollection.update(
{ "availableLocales.locale" : { "$in": ["en_US"] } },
{ "$inc" : { "availableLocales.count" : 1 } }
})
This update uses the $in and $inc operators.
Find collection where availableLocales holds an array containing locale with "en_US" value.
{ "availableLocales.locale" : { "$in": ["en_US"] } }
Increment the value of the count field by 1. Note that you can pass multi:true to update all matching documents, not just one.
{ "$inc" : { "availableLocales.count" : 1 } }
Please see the docs for more info on how these works.
--- more info:
Update ORDERS:
db.mycollection.update(
{
"categoryid" : "ORDERS",
"availableLocales.locale" : { "$in": ["en_US"] }
},
{ "$inc" : { "availableLocales.count" : 1 } }
})
Update MAIN_ORDERS:
db.mycollection.update(
{ "categoryid" : "MAIN_ORDERS", "availableLocales.locale" : { "$in": ["en_US"] } },
{ "$inc" : { "availableLocales.count" : 1 } }
})
Hope that this clarifies things further. It should point you in the right direction!