If I add items to a ListField on a mongo db document in a specific order and then write it to the database, is it guaranteed that all subsequent reads will see the list in the same order? e.g. write read this is using python mongoengine ORM v0.4.2 Answer Yes they do, the driver is faithful to the underlying d…
Tag: mongoengine
Python Mongo docker-compose Topology Error
I’m trying really simple example of mongo with python and got an error. Dockerfile: run_test.sh docker-compose.yaml: db_test.py: db.py: I’m doing docker-compose up and got this output: So it looks like it can’t connect to the database. I didn’t change ports or something, and another ex…
Query by computed property in python mongoengine
I wondered if it is possible to query documents in MongoDB by computed properties using mongoengine in python. Currently, my model looks like this: When I do for example SnapshotIndicatorKeyValue .objects().first().snapshot, I can access the snapshotproperty. But when I try to query it, it doesn’t work.…
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.
Mongoengine: Exception has occurred: ServerSelectionTimeoutError
I am having some issues connecting to my database on MongoDB. I am using mongoengine library to connect to the DB. I am also using ATLAS. Whenever I try to run my project it keeps showing “Exception has occurred: ServerSelectionTimeoutError” then show [SSL: CERTIFICATE_VERIFY_FAILED] certificate v…
MongoEngine: Close connection
I spent ages trying to find a simple example where MongoEngine was being used and a connection was being closed. Finally figured it out and posting my code. Answer I know this is an old question, but if anyone else is searching I figured I’d give an alternate answer. close() does not actually remove the…
How to make a combined set of fields unique in Mongodb in Python
I want to create a table where two of its fields combine to form an index field. My Python code for creating the table is as follows. What I want to do is make the combined fields course_name and group_name unique so that no two groups with the same course_name and group_name can be created. Can someone pleas…