The following code snippet is an SQL Alchemy ORM table definition class.

I’m struggling with SQLAlchemy. I have a model with a many to many relationship set up:

I’m struggling with SQLAlchemy. I have a model with a many to many relationship set up:

I have an ORM-mapped class Data which includes a ‘valid_until’ (datetime) attribute I use for versioning of rows. This means that rows in the table can be duplicates with respect to some attributes, but the ‘valid_until’ attribute sets them apart, allowing me to identify which one is the most recent. The most recent such row has a future “infinity” ‘valid_until’ and all previous rows have the ‘valid_until’ set to when they were superseded.

I have an ORM-mapped class Data which includes a ‘valid_until’ (datetime) attribute I use for versioning of rows. This means that rows in the table can be duplicates with respect to some attributes, but the ‘valid_until’ attribute sets them apart, allowing me to identify which one is the most recent. The most recent such row has a future “infinity” ‘valid_until’ and all previous rows have the ‘valid_until’ set to when they were superseded.

I have these data models:

I am performing a regular web scrape for laptop prices with Beautifulsoup. The data from these searches I want to put in a data base with Sqlalchemy. But for each search I want to add just one row, with the date of the search, and a new price for each of the 15 laptops (the laptop names are the names of the columns). I cannot figure out how to do this, your help is appreciated.

Can someone tell me how to use SQLAlchemy relationship if each model is in a separate file? Example:

I have the following models in sqlalchemy:

I have the following models in sqlalchemy: