[Enhancement] Capture the number of rows instantiated #585
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This is close to telling you the number of rows brought back from the database It doesn't show pluck results, so just need to keep that in mind. But it does help you understand why so much memory is being taken up from active record queries.
kbrock
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Goal
This uses active support notifications to capture the number of active record objects instantiated.
Useful?
If you just look at the number of queries, doing a bunch of outer joins looks like a great optimization.
But if you take into account the amount of data brought back, it keeps that over simplification in check.
I have been using this for >7 years and it is a key metric for me.
So I'm putting it out there and see if it is useful to others, as well.
Shortcoming
This only captures instantiation
Model.where(:category => 5).limit(20).select(:name)- capturesModel.where(:category => 5).limit(20).pluck(:name)- doesn't captureSince instantiations are a majority of our use cases, I've only seen a handful of cases where the
pluckmisrepresented a PR or an issue.This is only for active record notifications
I only implemented this for
ActiveSupport::Notifications. It could be done for the others, but I'd prefer to gauge demand before implementing this for every patch configuration.This isn't in the ui
I use the command line to view the results, so I haven't coded this into the ui.
If that is needed, would like a little help.