I’ve just encountered this problem yet again effecting code I’m working though, so I thought I’d quickly blog about it.
Put basically if you call count on a relationship it will always make a db call to see how many there are even if the relationship has been populated. If you use size or any? they [...]
Tag Archives: named_scope
Be careful how you count in Rails
Performance optimisation through named_scope
I recently gave a presentation about using named_scopes to WellRailed and while it was still on my mind I thought that I’d cover named_scope in conjunction with some performance optimisation work I’ve been doing.
I used to use relationship extensions lots and it always irked me that I was putting business logic for a model, say [...]
