I’m working on an API which requires the primary node’s name from an mongodb replia set. Is there a way to get the name and ip of primary/master node in a replicaset using the pymongo API? Or generally any way i could get that info from a python program? Answer Use the hello command. It will retur…
Tag: mongodb
AttributeError: ‘AnimalShelter’ object has no attribute ‘database’
I am not understanding why I am receiving this error as my .py file indicates that database is in fact an attribute. I have made sure that everything is indented as it should be and made sure that the correct .py is notated when importing AnimalShelter. I am following a walkthrough for this for class and the …
Why I am getting “Not Implemented Error: Database objects do not implement truth value testing or bool().” while running makemigration cmd in django
I am trying to connect Django with MongoDB using Djongo. I have changed the Database parameter but I am getting this error Not Implemented Error: Database objects do not implement truth value testing or bool(). when I am running makemigration command. Please can anybody explain why I am getting this error and…
how to find $avg and $sum for fields which contain NaN value in mongodb?
I can find and limit columns which contain NaN value before using $group clause in mongodb when I use mongo cli or JavaScript. However, when I use python and its major library “pymongo” it seems not to be able to do the same. As following code NaN is not part of python syntax. Whereas it is easy a…
How to create MongoDB Time Series Collection using pymongo
The documentation shows how to do it with mongosh, but how do you create Time Series Collection using pymongo from within a python script? Answer You can try this: General Reference: Time Series Collections
docker-compose throwing “ModuleNotFoundError” with pandas
I am trying to containerize a very simple Flask API that connects to mongodb. For the API’s output, I am using the pandas module. However, when I run ‘docker-compose up’, I get the following error: app_1 | Traceback (most recent call last): app_1 | File “app.py”, line 6, in app_1…
Sort an array by occurances mongodb
Is it possible to sort an array by occurrences? For Example, given return I am able to get it most of the way there but I cannot figure out how to join them all back together in an array. I have been using an aggregation pipeline Starting with $match to find the site I want Then $unwind on with path:
Mongoengine: Querying using __not__contains but with lists instead of string
I have a list of topics that I want to filter out from ‘title’ field in News Database. I want the solution to do the opposite of what __contains does, but contains works with string, and I want to give it a list in which it will filter out every news that will contain the words given in the list.
Display documents in a table from MongoDB with Jinja2 HTML
I currently try to figure out how to display multiple documents from my MongoDB collection “one by one”. My recent code to fetch the data looks like this: My HTML Jinja injection like this: The code itself works fine – but literally all URLs are displayed in one row of course. Right now I ca…
Mongo append to standardized string field based on mapping of multiple fields (including nested)
I have a large collection with fields like: I also have a Python dictionary mapping field values like: I’m trying to (in PyMongo) update my MongoDB collection so that a string field of mapped characters is accumulated, from both the top-level class field and the nested nested.classification fields. In t…