One to many relation in mongo database

[@rameshsuthar4341]

By using db.dropDatabase() command we would be able to delete one database at a time. So to delete multiply database we can use loop function like forEach() and loop all the database and delete them. The code:- Mongo().getDBNames().forEach(function(x) { if (['admin', 'config', 'local'].indexOf(x) < 0) { Mongo().getDB(x).dropDatabase(); } })

[@anshikgupta2993]

This video is really helpful but I still didn't understood how to link documents or how to link collections if you can clarify with more videos

[@piyushtakale4648]

someone please help me i have date stored in my mongodb database in ISO format i want to find documents using date in java i searched everywhere i havent found it. the problem is i have to store the date in the same iso format and search using date object only. and the date objects stores the date in like ... Thu Aug 20 00:00:00 IST 2020.... that is why its not working someone please help me

[@Code-Patel]

One question sir. What about when we need to add one more comment after inserting record? I mean to say what about when we need to update this db for add one new comment

[@paolourielenriquez9715]

You inserted a comment with reply, in comments collection, but didn't associate the reply, in replies collection, to your comment. The inserted document in replies collection was useless.

[@hikari00xx]

11:10 then what is this? an embedded or a link?

[@darshanraut554]

Waste of time

[@FeelFreeToCode]

Sir you are my motivator 👍😊😊😊😊

[@narutodihargo]

00:00= One to One, 00:50= OneToMany example, 02:05= Drop databases,

[@helloWorldPlus]

Hello. And how would be done if the id is auto generated by the Atlas MongoDB and is not known?

[@dharmendraprasad198]

show dbs use oldStudents db.dropDatabse()

[@mritunjaisharma1242]

how we can retrieve the data, if we have 2 database say 1db and 2db, in 1db we have 'user' collection which include some personal data like firstName, lastName, rollNumber in that we have some duplicate rollNumber user are persent and in db 2 we have 'trip' collection, where we have rollNumber, dateOfTravel, etc..which were created by respective rollNumber now how we can fetch the data which is having duplicate user detail from db 1 and respective trip also.

[@amanmanojpreeti]

To delete courses db: 1. use courses 2. db.dropDatabase()

[@kartikgupta3756]

How can we query the latest top 10 replies of that particular comment?

[@NewtonIsLive]

I wanted to know how to add a reply later when a comment has been inserted. and then how to fetch replies and their backwards how to know this reply belongs to which comment

[@charans1845]

If replies gets nested, how to design the database?. please reply.

[@villanprabu7539]

why did you create new collection called replies. some time we got replies of replies multiple correct . but you can use same comments table and just refer comments id only

[@danielalfonsogarcia7565]

how do i add more elements to that array?

[@dwezyow9146]

this is what i expected from the video, ops but theres nothing.

[@ashishchhikara7829]

use array.push(element)

[@viveks-yt]

What's wrong in referring the document?

[@johnnydriesen7575]

Supposing the next vid is going to be ... ManyToMany Relations ... Can't wait for it ... Since months, I'm struggling with situations like ... e.g. A Product has many Suppliers A Supplier delivers many Products A Product has a different price per Supplier ... Can't wait for a good solution :)

[@nadim.a4351]

I'm sorry, months? you could just check the mongodb website. It's true that it's easier to just watch a video, but if I had no other option I would check the official website documentation instead of just waiting for a video.

[@pradeepadmingradalpharecord]

Just an excercise to test my knowledge db.product.insertOne({name: "Product1", suppliers: [{supplier_id: "123", price: 321}, {supplier_id: "134", price: 341}]}); db.supplier.insertMany([{_id: "123", name: "Supplier1"}, {_id: "134", name: "Supplier2"}])

[@temitopeagboolanuel]

I'm also presently struggling with Mongoose populate which does the same thing. I've tried many methods, none is working; I've been literally frustrated by this.

[@vipinkrishna6536]

use hiteshDB db.dropDatabase()

[@kamranjaved5583]

Sir , I am working on a webapp where app require a company signup, i want to create a separate db for each company. i am using mongoose for mongodb .. since mongodb doesn't support query to create Database. So what should i do so that i can create my DB dynamically in a node js application Please help me ..as i am new in this field

[@wassaufkhalid8593]

A better approach could have been to use the id of the comment inside the reply object. This will not require addition of ids to comment each time while adding a new reply

[@sajed8077]

Love from Kashmir sir

[@tejasmahajan4040]

Hi Hitesh, I have come across a scenario I have Hashmap in document Map, and I want to find document on basis of string which is present in List of value in map, is it possible can you please help me?

[@ArifAli-hl2xk]

what happen when someone edit that reply?

[@code_react]

Well the second method is pretty good but i am thinking about memory of mongodb document. i guess it provides you 16mb size and i am sure that by using second method your memory will fill up very quickly. Note: i am not mongodb expert i am also beginner but i read that on mongodb docs.

[@gaganchoudhary6114]

Use the delete delete('delete key':'delete data',()=>{using callback})

[@Script_Sage]

Embedded or Referenced.

[@aninditadas7348]

Hello,Thanks for the video. But how can we edit a single reply, if we approach the second one?

[@angulardesign7412]

plz make on nodejs sequalize relationships hasmany like

[@omarhegazi1613]

these are a normal crud operations that has nothing to do with relations in mongodb , please understand the subject first before recording a video

[@dharsan.s7937]

Hi tech my bro / teacher I love u brooooo

[@prakharsingh4531]

db.dropDatabase() command used to delete existing database

[@masifqadri12]

Sorry Boss Not Agree with the current example in replies, table add _id column with reply/replies

[@FeelFreeToCode]

Great 💐👌👌👌👌

[@SamareshMaity231]

thank you

[@vishaltalukar6676]

Can to make videos on data science using python for free?

[@krushna7467]

db.name.drop() ?

[@mr_don_key]

very odd that you can explain relationships in mongo.. but are not able to remove collections.. :)

[@praveenrangasubhe9374]

db.collectionname.drop()

[@taherlunavadi2559]

use youtube db.dropDatabase()

[@techspider2528]

use exampledb db.dropDatabase()

[@teklezegergish]

Use drop to delete from mongo DB

[@fincept-tilak2172]

Data science

[@cristianyamidperezgranda2949]

Thanks, ¿what's is the best way to get all replies from all comments?, is convenient create other collection to duplicate all replies?, thank you, nice video

[@disasterunfold7885]

db.dropDatabase() as simple as that

[@jijinp1612]

mongo youtube --eval "db.dropDatabase()"

[@pavanagarwal6753]

can i edit my comment? Answer is "yes"

[@Srinath666]

use and after that db.dropDatabase() to delete

[@muramullasiri5087]

db.dropDatabase()

[@sweetdevil3647]

db.COLLECTION_NAME.drop() !!!

[@vishaltalukar6676]

First

[@akhilakhil9325]

poor

[@NewtonIsLive]

you wasted my time , waste of time

[@NewtonIsLive]

you wasted my time..

[@usamajaved3509]

> show dbs - list of Databases > use > db.dropDatabase()

[@omkanade5]

show dbs use oldStudents db.dropDatabse()