i mean how to create a dynamical collection on Mongodb using node js, (equivalent to add column with a name chosen by user on Mysql).
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I am using nodejs, mongodb as my data base and mongoose. I wanted to use partialFilterExpression to handle issue with mongodb saving null as unique value when I set unique to be true and a user provides an empty value for that object.
I am using mongodb Atlas. I didn't install mongodb in my local machine. Methods that I have seen online on how to use partialFilterExpression didn't explain if it is possible for developers who are using mongodb Atlas. I have tried using it inside my mongoose schema but it didn't work.
Can partialFilterExpression be used inside mongoose schema? If no, how can I use it with my mongodb Atlas database system?
Thanks
i am currently creating a nodejs app that deals with huge data. I created a table(.csv file) in excel and then converted it to to JSON file and added the document to MongoDB Atlas under the collection
players. The collection is huge, hence i did not create the collection inside from Node.JS. Now I want to refer to the fields inside the MongoDB collection from my Node.JS application and using it as a model..
how to solve this problem.....
You can just create a mongoose schema and model as you do normally. But, name the model player so that it points to your mongodb's players collection.
I am new to Raspberry Pi and Node-RED. I am want to add custom node to firebase using Node-RED nodes. Here is my database screenshot :
I have used push option of firebase node to create multiple nodes with auto generated ID's. I want to give custom ID like "User1", "User2" and so on using firebase node in Node-RED. How can this be achieved.
push() always generates random IDs. The names of these nodes can't be changed after they're added. If you want to assign your own names, you will need to build a path to the node you want, and populate it with set().
Is there a module for performing validation in core mongodb driver of node.js. Similary how mongoose does it. As I would require mongodb in a new client project instead of monoose.
MongoDB introduced validation in collections in version 3.2 -
MongoDB provides the capability to validate documents during updates and insertions. Validation rules are specified on a per-collection basis using the validator option, which takes a document that specifies the validation rules or expressions.
You can read more about it in the official docs of MongoDB here.
As far as Node.js MongoDB driver is concerned, then it will also provide this feature out of the box. No need to install any other module. You can check this official tutorial which shows you how to use the Node.js driver to set up validation.
Keep in mind one thing that Mongoose provides you with application level validation so you save on the round trip time as you don't need to go to the Mongo database to validate your data. Whereas the native validation is provided by the Mongo Database itself hence a round trip would be necessary from your application to your Mongo Database to validate the data.
I'm using Mongo Express to view my data in my MongoDB instance during development. I also use the connect-mongo module to store my sessions in MongoDB. For some reason, Mongo Express has difficulties parsing embedded documents created by connect-mongo. The indention doesn't quite work and quotes are escaped. Documents created in connect-mongo do work, as well as those created with mongoose.
Looks like connect-mongo stores its data as strings, rather than as embedded documents. You can try using the default MongoDB shell - mongo and confirm if it's the case.