Nosql Questions

I've made some updates in article model and it's affects to all elements in the collection so i need to update whole collection. i don't

I am using firebase rules simulator, but it denies read, write for authenticated or non-authenticated users. rules_version = '2';

I'm doing a little test thing to get into firebase. but now when i'm trying to access my timestamp object, it returns undefined. this is

I am building an android(java) app that reads data from cloud firestore and displays said data in a list view. currently i am planing on querying

Right now what i'm doing is: write some data in 3 different tables perform some reads to check if new values

I am working on a migration from ms sql to dynamodb and i'm not sure what's the best hash key for my purpose. in ms sql i've an item table where i

When i used to work with ms sql server i used to create for example this query select sum(amount * price) from table

I have a collection in firestore where some documents contain an array but some don't. the structure looks like this: document1 = {

So i was wondering, the one downside i have to nosql is: if my front end app ever drastically changes then i would have a horrible time

How would you structure your cloud firestore db. i have collections of teams, arenas and games: public class team {

I'm trying to make trivial sum on mongodb to count number of prices for single client. my collection:

I'm new to the nosql world and i'm wondering if there are some known good patterns established for maintaining a manually sorted list.

I tried to design a book sharing app. a user can enroll in different group and share his books. each book contains field

I am using apollo graphql for getting a list of different models or types. i tried to use inhirit, but i didn't get it. i was trying to use whole

I am trying to implement soft delete by having a field on every document deletedon that is either a timestamp or null. but so far it

I have a firebase (nosql) collection of say 5,000 "players". each day i want to query a subset of those players in order to perform some

I have a collection of tasks on my firestore database like this: "tasks": { v8nc4govvope21fhwtp0 : { id:

Some times ago i found a few articles that keep saying that mongoose is prevention for nosql attacks but know i found a different article saying

Input: created_at:monday, 29 april 2019 15:07:59 gmt+05:30 updated_at:monday, 29 april 2019 15:07:59 gmt+05:30 i tried

I'm creating a dating app with react native and firebase cloud firestore. in my app users can dislike other

Is there any way to get all unique field value in firestore using a collectiongroup query like a select distinct ?

Similar to another question i had (here). but now i'm trying to count unique and total

I am learning mongoose relationship and stuck in this problem... someone tell me where am i wrong..? and is there a better approach of doing

The data looks like this. i need to calculate the distance travelled by a user. i achieved that and can specify a date range and it shows the

In my flutter app. i have to fetch data from firebase using multiple filters. i've done as below. it worked but the problem is that some

My database structure is appname: tasks: childbyautoid1: "name": "myname"

I'm trying to make a chat app that can have chatrooms with max two users. i got a collection chatrooms and chatroom-documents with

I'm trying to struct firestore database for chat application. i want to add owner's reference of chat room into specific chat room. here is my

In my gym log app you can create an own gymplan. this plan will have a fix amount of exercises where you can note every day your stats for each

I would like to know how i could structure my database in order to avoid doing n requests for all the joins i want to do. firebase gets quite

I am learning my basics for firestore and trying to build an app which allows user1 to share a document with user2/3/4 etc. for billing

I'm working on a contact-app for android with firebase and i want to read values (here: the users' profile) from a user in my database that

I have a php function that gets the following json file from a firebase db and creates an object called $data. keep in mind

I am fetching data from firebase using ref(). the issue , i am facing is when there is no valid child path means, its fetching whole parent. for

I want my code to be able to connect to a wide-column store database like cassandra or dynamodb and read/write information to it. i have

I realise there is many questions in regards to replicating joins with nosql document databases such as firestore, however i'm unable to find a

I'm trying to update a property inside an object using $inc in mongoose. i've tried several ways but apparently the syntax is not valid.

My firm asked me to get all the documents from the root collection, users. they must be sorted according to the value of a numeric

I'm building an app using react + redux + firebase. in firestore users collection, i have multiple fields including language, subject as map data.

For example instead of a field named, column_1, that holds an embedded document with fields a, b, and c. why not 3

I am wondering if i am modelling my firestore data models correctly as i realise the current way will result in a lot of requests to the

I have collection with some documents. sometimes i need to move certain document to another collection (aka archive) and i also need to add

I am using mongodb with nodejs and i am trying to find the usertype value of a specific user so i've got this: var myquery= {

I am trying to update all records in my mongodb database. i want to sort the records based on a date(updatedat) in the ascending order. and then

What is the best way to figure out how many documents are being created per hour into a firestore collection. i have created a cloud functions

I'm working on an app where you can follow/unfollow other app users. so in firestore i've got a collections of users, and each user contains a

I want to track the number of unseen messages for each member of a group chat. i store chat metadata in a chats collection, and

I have a simple question. i am building a instagram clone app and i want to show each user to their friends. also they can see the friends list. i

In my firebase project i need to query all users who are available on a certain date at a certain city and sort by some other criteria.

I have section of code that updates a variable by the return of a firebase query. outside of this section, i reference that variable and print

I am working on a social network app from scratch, i designed my database (choosing mysql) to store and retrieve data the problem starts

In my app i currently have three collections: db_contacts firestore-root | --- db_contacts

After extensive research and a very thorough comparison i've found that all nosql databases uses json to store data, collections and what not.

I want to store data in following format: { "chatname": "football", "chatmembers": [ { "userid":

This is my first firestore – and nosql – project, and i'm struggling with modeling my data. i have a number of objects (in the order

I have these two collections which i want to join as 2 conditions.the examid and the user id .i am using mongodb version 4 and nodejs.there is no

I'm working on a flutter app where each user can create projects, and share projects with other users. i've created a 'shares' collection, where

I'm new to cassandra and i've been having some issues trying to delete multiple rows in table. i have a table defined as follows:

For a facebook type social networking app, a high performing database structure is required, for storing data in firebase(cloud firestore)

Intro i have a firestore database similar to a social media db, with 3 collections users, events, and eventupdates. my goal

I am building a messaging system in node.js,socket.io and mongodb. i am well aware of node.js and socket.io but i am new to mongodb. here are my

In my android project i need firebase to load/retrieve my list of 'children' (user with name) when retrieving an object (group) that is in a

If you cannot understand the title i am very sorry. i am new to nosql don't know how to address this problem. i am having a nested

I have a collection accounts structured as follow:

I am trying to register 20 users and create a document on my collection for each of them on firebase firestore. my program successfully registers

I want to retrieve all the documents with their variants except variants which has property isdeleted : true [ {

I want to make request to mongodb via mongoose. i need in get documents in interval. for example: i have cats with their ages:

I am going to develop android mobile app and going to use firebase as backend. i am new to nosql firestore. in my app an user has many

My app has profile and work databases (and others) stored locally using sembast db. please look at the two examples below, which one is a better

Am looking at the data structure in this

I am trying to create a nosql database for a flutter app that has different stores for different activities done throughout the day (sleep,

Is there a way to sort by a given array? something like this: const somes = await somemodel.find({}).sort({'_id': {'$in':

I am trying to query my firestore database using cloud functions. i want to trigger an email notification every time a new reading in my database

I want to do something like: final collectionreference = firestore.instance.collection('mycollection'); final list<string>

Using flutter package called sembast. what are the difference behaviors between these two commands?

Why is it that i can't seem to update a result set. i have 1000 items and i query firebase and get back a datasnapshot array. i want to check

How can i join data in flutter firebase realtime database. data model on appended screen i've something like this.

I'm developing a mobile application in flutter, and i would like to manage the settings of my application (light theme or dark theme, ...).

I am planning to develop production ready hybrid ionic3 mobile application similar to instagram using firebase.

I have the following table structure: create table test_keyspace.persons ( id uuid, country text, city text,

I am building an ios app that is using cloud firestore (not firebase realtime database) as a backend/database. google is trying to push

I want to scan all items for last 7 days, so what i do is i generate timestamp for 7 days back and filter for timestamp greater than that value.

So i am definitely a firebase and just generally a nosql noob at this point. here is my issue. i have a set of data like so

I'm using the mongoose odm wrapper for nodejs and i'm concerned about injection attacks.

Lets say that i have two sets of coordinates that bound the island of bermuda: x1y1 = [32.43059334605672,-64.90143284218118] x2y2

I'm trying to model a database structure to retrieve restaurants within a specific city. for example: when a user accepts

I want to merge two json collection with vue. { "menu" : { "-lejeln1gntoi0u_xcgo" : { "available" : true,

Documentation goes as far as explaining how to write the following data types: data = { u'stringexample': u'hello, world!',

I'm building an app where i need to get the list of tasks planned for today. but i'm not sure how to write the query for it. this is the

I am currently working on an app that will connect clients and craftsmen. right now i am structuring the database and thinking about possible

I have been going through some nodejs/mongoose code and i realised that there are some codes which explicitly define the _id field when trying to

Let's say i have a collection of cars and i want to filter them by price range and by year range. i know that firestore

I'm working on a flutter application that basically allows users to place orders to restaurants then go and pick-up those orders. a

In hibernate we can automatically create db and tables (sql databases) using entity classes. is it possible to achieve the same facility in

I am curious to know, if firebase uses sqlite under the hood to save its data for offline use or it creates a file saving the data or anything

I've had some relational database experience, but i am quite new to nosql databases. i am trying to do the following (in firebase firestore) i

summary: i want to use the 'skip' function used in mysql and mongodb. however, 'startafter (number)' does not skip.

I have a firestore database with a lot of data in it. in my application i have to get a lot of documents from it at once. i know the exact

Func databaseconnect() (db *mongo.database, err error) { ctx, cancel := context.withtimeout(context.background(), 20*time.second)

Consider the following code: findandmodify({id: id}, undefined, {$inc: {counter: 1}, {$max: {counter: 10}) this