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NARKOZ
on June 28, 2015
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Using Nested Selects for Performance in Rails
Author could use counter cache to solve the problem.
schneidmaster
on June 30, 2015
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Author here. That would work for a count (so perhaps that was a poor example to choose for this post) but we also use calculated_attributes for many more complex cases (for example, querying the earliest date in 3 columns across 3 tables).
NARKOZ
on July 5, 2015
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There is a gem called eager_group that you might find useful.
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