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Attentive reader could notice that in every described case, it was a requirement to explicitly list data that we want to preload for a group of users. Gladly, there is a simple solution! ArLazyPreload will make N+1 disappear just by enabling it. As soon as you need to load association for any record, it will load it once for all records that were fetched along this one. And it works with ActiveRecord and N1Loader perfectly!
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It's worth mentioning counter_culture alternative that has many features compared with the built-in counter_cache
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Unfortunately, such associations are not possible to preload with includes. Gladly, there is a solution with N1Loader.
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Thank you for sharing this with me! It seems that https://github.com/salsify/goldiloader gem does the same as https://github.com/DmitryTsepelev/ar_lazy_preload. It would be great to compare both solutions.
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