How to order data in sqlalchemy by list

Question

I have list of ID from external postgresql database.

A = [1,2,3,4,5,6,7,98,0]

I would to do query to database using SQLAlchemy, but I would

Answer 1

Here's the example of sorting by using SQLAlchemy case expression.

from sqlalchemy import case

from core.orm import session
from core.orm import models

query = session.query(models.Model)

ids_list = [1, 2, 4, 3, 5]

# order query by index of id in `id_list`

id_ordering = case(
    {_id: index for index, _id in enumerate(ids_list)},
    value=models.Model.id
)

# order 
query = query.order_by(id_ordering)