Learn how to use Docker Compose to run multi-container applications easily. This is the second video in this Docker series.

Learn Docker in 12 Minutes: https://youtu.be/YFl2mCHdv24
Deploy Docker Containers with Docker Cloud https://youtu.be/F82K07NmRpk

Source code https://github.com/jakewright/tutorials/tree/master/docker/02-docker-compose

Support this channel at https://www.patreon.com/jakewright

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Prologue:

This is a question arising often in SO:
Django Models Group By
Django equivalent for count and group by
How to query as GROUP BY in django?
How to use the ORM for the equivalent of a SQL

I've got a table in PostgreSQL 9.4:

user_votes (
 user_id int,
 portfolio_id int,
 car_id int
 vote int
)
Is it possible to put a constraint on the table so a user max can have 99 point to vote