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Boring Rails: Skip the bullshit and ship fast |
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Find records missing an association with `where.missing`
https://boringrails.com/tips/activerecord-where-missing-associations
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You can’t prove a negative, but what about querying a database for a negative? While the majority of the time you are writing queries to find data, there are some cases when you want the opposite: writing a query that looks for the absence of data.
