Questions tagged [MongoDB] (1430)

I have, for example, 10 000 different products, and they belong to the 300 categories (electronics, food, toys...). The question, as in this case the right to select the list of categories in the database mongodb? I have the option to create a separate model for categories, and each adding new product to check whether such ...

Help, I do not understand the logic! I have a collection of galleries, and each of them can have an array of albums. And gallery and albums can have their picture thumbnail to display in the list. I add the field image to the gallery without any problems, and everything is fine Merida: db.photos.update({_id:"1587050015794"...

Is it possible in one query, add and delete fields from a single field? db.colll.update({ tags : 1 },{ $pull: { tags: 1 }, $addToSet: { tags: 2 } }, { multi: true }) Does not work, as mongodb does not allow to appeal to one and tomuzhe field

Is the server in online - Windows server 2012. In the Internet Ip is the same as the car. Trying to connect to a MongoDB database on the server from home, but no way. Apparently the problem is not in the database, namely in Windows. set to check the telnet on both computers, from home ip and port will not connect. The port...

Hello!!! Need help!!! The user regaetsya to the site and fills in the information for your personal account, and next time when the authorization data is displayed on a personal account! I do not understand how to do it Do not judge strictly, I'm only a beginner

All good! I have let's say a basket that consists of an array aytemov that are in the database. products = [ { ID: 'co-00578_12-04-2020', name: 'item1', size: '1', qty: 1, imgUrl: 'img-url-co-00578.jpg', modified_on: 2020-04-12T13:59:32.423 Z }, { ID: '22b4b7b4-a2ea-11e8-b8f2-208984330634', name: 'item2', size: '1...

there is a structure db1 { "_id" : UUID("83ccb7fc-0c42-4121-b4f9-6c7f2fb82fdd"), "items" : [ UUID("7eb90f2f-180e-4531-90ac-0ea1946f5155"), UUID("0e1e885f-4cee-4ef5-8220-b8d503ac3337"), UUID("543e4187-b752-4978-89df-234aca92a77c"), UUID("0e6e2c89-f007-4147-a433-ee0325ba2719"), ] } db2 { "_id" : UUID("7eb90f2...

Hello. Write telegram. bot in nodejs + mongodb. It sends messages with pictures and description on request, there are filters and no messages are repeated, until all in the same category. Filters and id viewed is stored in the database, in the user's document. When performing this function, the load on the VPS processor j...

The question in the title. Adminer is not suitable, because of its incorrect work. It is desirable that the solution was simple to install, not java

The essence of the question is whether the saved data after restarting the computer, or is it B. how redis stores data in RAM and to use it for cache?