ORMs and slow DB queries kind of go hand in hand. Also, you'd be surprised at how efficient arrays are for membership checks so long as the number of items is e

ORMs and slow DB queries kind of go hand in hand. Also, you'd be surprised at how efficient arrays are for membership checks so long as the number of items is even moderately small (as a rough rule of thumb, the only thing that really matters with these kinds of checks is how many cache lines are involved).