Morphia aggregation stage group with object push

Morphia aggregation stage group with object push

I’m using that latest version of morphia (1.3.2) and I’m trying to replicate the following succesfull mongodb aggregation stage in Java:
{
_id: null,
pv: { $push: { t: ‘$_id’, c: ‘$c’ }}
}

example input to stage … Read the rest “Morphia aggregation stage group with object push”

MongoDB “NumberLong/$numberLong” issue while converting back to Java Object

MongoDB “NumberLong/$numberLong” issue while converting back to Java Object

I am having a json which is somethink like {“Header” : {“name” : “TestData”, “contactNumber” : 8019071740}}
If i insert this to mongoDB it will be something like
{“_id” : ObjectId(“58b7e55097989619e4ddb0bb”),”Header” : {“name” : “TestData”,”contactNumber” : … Read the rest “MongoDB “NumberLong/$numberLong” issue while converting back to Java Object”

Why Mongoose sort is slower than native javascript sort?

Why Mongoose sort is slower than native javascript sort?

I’m using Node.js 6.10.0 and Mongoose 4.8.5. Actually I’m trying to find the nearest coordinates from a coordinate and with a certain datetime. I have billions data into my MongoDB. I want to apply a sort … Read the rest “Why Mongoose sort is slower than native javascript sort?”

Does index help in Mongo bitwise query

Does index help in Mongo bitwise query

I learnt that bitwise query was introduced to MongoDB since 3.2.
ref: https://docs.mongodb.com/manual/reference/operator/query/bitsAllSet/#op._S_bitsAllSet
Will these queries be speed up by indexes on numeric fields? If so, how does it work?

Solutions/Answers:

Solution 1:

mongodb does not support index

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How to get the value for a nested item inside a collection?

How to get the value for a nested item inside a collection?

Suppose I have this document:
{
“_id” : ObjectId(“4e2f2af16f1e7e4c2000000a”),
“location” : {
“geometry” : [
[ 123, 23.45321 ],
[ 124.55632, 43.256 ]
]
},
“advertisers” : {
“created_at” : ISODate(“2011-07-26T21:02:19Z”),
“category” : … Read the rest “How to get the value for a nested item inside a collection?”

Mongoose select,populate and save behaving differently on Mac and Windows

Mongoose select,populate and save behaving differently on Mac and Windows

Here’s what i did
static populateReferralLinks(){
return Promise.coroutine(function*(){
let companies = yield Company.find({},’billing referral current_referral_program’)
.populate(‘billing.user’,’emails name’);

for(let i = 0 ; i < length ; i++){ companies[i].referral.is_created = true; companies[i].referral.referral_email = companies[i].billing.user.emails[0].email; companies[i] = yield companies[i].save(); } return companies; }).apply(this) .catch((err) => {
throw err;
});
}

I have a funciton in which i … Read the rest “Mongoose select,populate and save behaving differently on Mac and Windows”

Can’t connect to mongo from flask in docker containers

Can’t connect to mongo from flask in docker containers

I have a python script that runs the following
import mongoengine
client = mongoengine.connect(‘ppo-image-server-db’, host=”db”, port=27017)
db = client.test_db

test_data = {
‘name’ : ‘test’
}

db.test_data.insert_one( test_data )
print(“DONE”)

And I have a docker-compose.yml that … Read the rest “Can’t connect to mongo from flask in docker containers”

What are the differences between starting mongod as a service and starting it as a normal executable?

What are the differences between starting mongod as a service and starting it as a normal executable?

The official MongoDB documentation says:

Issue the following command to start mongod:
sudo service mongod start

However, the reputable MongoDB: The Definitive Guide, 2nd Edition says on page … Read the rest “What are the differences between starting mongod as a service and starting it as a normal executable?”