Implementing a queue with the Python-Rom Redis ORM

Question

I am working with flask and redis. I use the rom redis orm to manage some mildly complex data structures. I want to use a queue of model objects, with the ability to push or pop objects off either end.

I have the following rom model:

class A(rom.Model):
    url = rom.String(required=True, unique=True)()
    t = rom.String()
    delete_at = rom.Float(index=True)
    created_at = rom.Float(default=time.time, index=True)

I see that at the command line when I run obj._columns (with obj being a single instance of class A), that there is an id field. My first thought on how to approach this is to order by id:

queue = A.get_by(id).

This would allow easy addition to the back of the queue, by setting:

obj.id = len(queue)+1

But I'm not sure how to insert into the 0 element of the list which would require renumbering of the ids of the entire list.

Am I on the right track here? What is the best way to implement a queue?

Josiah · Accepted Answer · 2015-08-07 18:44:33Z

1

I wouldn't implement a queue with rom. If I needed a queue, and I needed to put rom entities in that queue, I would use the raw Redis connection to put entity ids in a Redis list - which offers push and pop from both ends, range scanning, etc.

You can get the raw Redis connection in your example via: A._connection.

answered Aug 7, 2015 at 18:44

Josiah

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