Rails Counter Caches

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Комментарии
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You can actually see the difference in performance with a small DB. On 13:53 we can infer that the update took 0.0396s (total migration time - add column time) and on 18:44 it took 0.0002s to do the same change.

Also, you can call user.forum_posts.size and it will default to the counter_cache column instead of querying the database, and if someone drop the counter cache you don't have to change the view

gmmcal
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This is a pretty good tutorial. Thanks for sharing!

mauriciofmartinez
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Chris, Rails guides say that "Rails will keep the cache value up to date, and then return that value in response to the size method." So you should be using #size method instead of #forum_posts_count. Without counter_cache: true in your model if you do User.last.forum_posts.size (or whatever model you have) it will trigger SELECT COUNT(*) FROM ForumPosts. Come out of the console, add counter_cache: true, open console and run User.last.forum_posts.size again and you will see that no SELECT COUNT(*) FROM was triggered. Same happens in your view. If you have 10 000 users, without counter_cache: true you will see 10 000 COUNT(*) in your logs whereas with counter_cache: true you will see no COUNT(*).

trailblazer_nomad
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Thanks, bro. This has been really helpful

mosesoloo
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I did not see when he create the forum_thread, is it already created?

ercntreras