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MissingIndexChecker

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Evgeniy Demin edited this page Nov 25, 2022 · 1 revision

Imagine your model has a has_one :user association but has no index in the database. In this case, querying the database to get the associated instance can be very inefficient. Mostly, you'll need an index to process such queries fast.

Additionally, has_one associations should be unique on the database level to avoid unexpected behavior.

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