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Advanced Active Record: Using Subqueries in Rails
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How to get unique record by special column from a where method with Rails? : r/rails
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DISTINCT in PostgreSQL: Select, Order By & Limit (Examples)
A Visual Guide to Using :includes in Rails
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GitHub - equivalent/public_uid: Automatically generates random unique public id for record.
Steve Polito on Twitter: "Have you ever needed to get the most recent record for each user in #rails, but didn't know how to do it without using map? Here's one way
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