MongoDB is a scalable, high-performance, open source, document-oriented database. It supports a large number of languages and application development platforms.
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count and match related documents in mongodb [on hold]
I have users collection and book collection:
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2answers
52 views
Avoiding nested callbacks when using MongooseJS
I'm diving into the world of nodejs and mongo. I am playing around with a simple app that uses MongooseJS to talk to Mongo. I have been looking at examples and some GitHub projects for references, but ...
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1answer
37 views
Finding mongodb records in batches using mongoid
I want to get records in batches. But mongoid doc says to avoid using skip due as it can be expensive. I wrote this method to iterate through a large number records efficiently.
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1answer
36 views
'join' MongodDB collections with a for loop
This is a very simplified version of my query. Is it acceptable to join the two collections for the client with the use of for loops?
There could be up to 2,000 books, which also means there could be ...
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81 views
Get last n items from collection in order from least recent to most recent
I wanted to get the last n items from a MongoDB collection starting with the least recently added element (lowest id) and ending with the most recently added element. After that I want to stream them ...
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0answers
16 views
Node.js stream of objects from MongoDB
I have a collection inside MongoDB with thousands of documents. A document should be processing depending on some logic. To make the point simple, I suppose here there is a field ...
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0answers
52 views
GitHub user graph crawler using akka
This code queries the GitHub followers API and stores the graph in a mongodb collection:
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0answers
18 views
Matching a current user's “liked / followed” items with results from a search query
This is pretty ugly now. My main objective is to perform a search query, which I do via mongoosastic / elastic search (the search paginates 12 items at time). Then, I want to match those results with ...
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58 views
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46 views
Generating a random ObjectID
We want to ensure that certain documents in our DB get distributed well across the shards. Currently the documents are sharded by their _id, but they are often ...
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100 views
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81 views
Handle decimal in mongodb
I'm trying to find a way to handle decimals in mongodb. Is there any good way and/or should I handle it with a class like this:
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0answers
19 views
MongoDB Per-Module Reusable DB Object With Reconnection Handled
This implementation was derived from the following requirements. I would like to learn that whether the implementation is clean enough, without memory leak and performance hit.
Requirements
Always ...
2
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1answer
84 views
2
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1answer
142 views
MongoDB CRUD operations for various types of data in Go
First of all I am a newbie in Go. I wrote a CRUD REST API that consists of handlers, a database layer and so on, and it contains a lot of code duplication. I see some patterns here, and I know how to ...
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0answers
41 views
Locate enteries to the nearest date selected
This code loops through a given range of dates and for every 5 minute iteration pulls up the last known records of the users in the database relative to that timestamp.
I'm trying to find a way to ...
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2answers
71 views
RSS to JSON for insertion into MongoDB
In my code, there is a chain of functions call where the deepest function may throw an exception. I catch and handle it according to the business logic. The problem is that all other functions in the ...
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1answer
79 views
Retrieve rich text from GridFS with Java
I am writing a storage for articles and I have decided to use GridFS from MongoDB. I have found and tested some code, but I am not sure that it is a best one. Could you advice me how to make it better?...
2
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0answers
90 views
Managing modules in phone book app
This is a test app built with NodeJS, Express and MongoDB. This code is the main and complete JavaScript file. I would like suggestions on dividing it into different modules and making the main app.js ...
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32 views
Script to migrate event, artist, and venue information from MongoDB to Drupal
At first I brute forced the migration to just get it finished. However, the procedural program mixed the events with the venues so I rewrote it, this time using classes which I'm just beginning to use....
2
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61 views
Knowledge base app using MEAN stack
I've been working on an app based on the MEAN Framework. I have got the app working but I just wasnt sure whether my coding structure and standard was good enough, meaning does it adhere to the ...
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203 views
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34 views
Properly updating multiple MongoDB documents with Angular
In the app I'm creating, when a user upvotes a post, the post should be upvoted, as well as the user that wrote the post. But this updates two MongoDB documents. This presents a number of issues. I'll ...
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1answer
276 views
Nesting BsonDocuments in MongoDB queries
I have a MongoDB collection setup where each document's JSON looks like this:
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265 views
Sentiment analysis on tweets in MongoDB
What i have done here is used 2 scripts in which from my main file I am using streaming api for particular handles and that data being directly pushed to ...
4
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1answer
50 views
MongoDB - Find records in one collection that match string in 2nd collection
I have a MongoDB collection of product IDs/unique products attributes and a second collection of codes that relate to attributes common for products whose IDs are prefixed with those codes.
For ...
5
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1answer
208 views
Listening from Mongodb always and triggering
I am using classes for the first time. In this program I want the object to run infinitely so that any change in the MongoDB will trigger the function and do the necessary processing.
I am little ...
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1answer
218 views
mongodb query in waterline,sailsjs
Because it is a lot of code, I don't want to ask for details what is wrong, but want to ask about review what can be changed in approach to this.
This is controller that make query:
It grabs data ...
3
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1answer
312 views
Updating state with React
I am creating a blog using React, MongoDB, Express and Node. I have three components: App, List, and Item. The item is a blog post; the list is a list of the blog posts, and the app includes a place ...
5
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1answer
135 views
Image duplicate finder
I have a bunch of exact-duplicate pictures that I've acquired over the years. I'd like to create a list of all them so I can eventually delete some. My idea was simple: dump the hash and location of ...
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2answers
168 views
Builder pattern for users in document database
I'm attempting to make a builder pattern that makes sense and is practical for storing user data in a flexible way in a document database. The DB I chose is MongoDB, and I'm using its Java API ...
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47 views
Trade off in database efficiency versus a nested for loop on client
I built an app where a user has a recipe box with recipes in it - for the db, there is a user and recipe model, user has "recipeBox" property. The recipebox is an array of objects like so:
User ...
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2k views
A plugin that integrates Angular Smart Tables with Mongoose DB for server side pagination
I'm using Angular Smart Tables with data that might become a huge set of documents and rows. So rather than client side processing of the data for pagination, I borrowing code from two Mongoose.js ...
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2answers
268 views
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59 views
Pulling Docker Machine IP
I am working with MongoDB through Docker, and I have a terrible bash command to pull the Docker Machine IP so I can sanely connect locally.
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8
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1answer
58 views
Retrieving StackExchange sites and tags
I have setup agenda tasks to periodically retrieve and possibly insert new SE sites and tags in my MongoDB database.
Some things that bother me in particular:
Lots of code duplication
No string ...
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1answer
139 views
Flattening a 2D array to use map/reduce
I have been trying to get better at functional programming, which includes understanding map/reduce. I wrote a function intended to fill an autocomplete with values. The challenge I was encountering ...
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2answers
3k views
Get all followers and friends of a Twitter user
I'm trying to find my bug or any potential bottleneck that cause my program to be really slow. The script is to get all the followers and friends and save that in MongoDB.
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0answers
70 views
Pulling data quickly from mongodb with node.js
I am currently struggling with a request I am making to my server that is taking more than 4 seconds! I cut out a lot of the cruft to hopefully make it easier to read. Excuse my horrible variable ...
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234 views
Game server in Java querying MongoDB for JSON
I was hoping someone would have a look at how I retrieve the questions from the db, parse the JSON and process the results - possibly advise how I could improve efficiency by streamlining my code. I ...
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1answer
236 views
Multi-player game server accessing and querying MongoDB
I have a remote hosted server that's running Java VM with custom server code for a multiplayer real-time quiz game. The server deals with matchmaking, rooms, lobbies etc. I'm also using a MongoDB on ...
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734 views
MongoDB repository, dynamic objects, Razor Templates
I am writing a repository for MongoDB and are looking for some review at its current state. I am looking for ways to improve it without adding complexity.
Should I be using a Singelton pattern for ...
2
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0answers
29 views
Modify records at one time
Do you think this works well? I.e, do I need to close the database connection at the end? The goal is to be able to upsert and delete many records in one shoot.
Here is is an example HTTP POST ...
7
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2answers
102 views
Recursive download articles and dump to MongoDB
This is simple code that recursively downloads articles from the public WordPress API:
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8
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1answer
364 views
One-to-many relationship with Python objects
I have built Python objects to simulate a one-to-many relationship and then store the object in a MongoDB instance. I am using lots of composition to achieve what I want. The code works perfectly fine ...
3
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1answer
183 views
Realtime chat service
I am new to Node.js and Socket.io. I implemented a realtime chat service that has a chatroom feature. When the actual product is launched, there will be at least 200 concurrent users with 50 groups of ...
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1answer
254 views
Constructing MongoDB document from a dict with character code-to-integer translation
I have an class definition:
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4
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1answer
108 views
Tabulating a report
I have a method for generating a report in Python. I want to organize the section about the date into a separate method so I can repeat the report for different dates.
What's the best way to ...
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3answers
65 views
Top-10 lists of occupations, ranked by various attributes
In the code below, all pairs of functions are very similar:
set function
rankListId is different
rankListName is ...
2
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1answer
2k views
Node.js Paging with Mongodb
I want to create variable paging on Node.js with MongoDB. I use MongoJS on client side create a request:
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