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Rails scope does not cache
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| Rails cache SQL calls | |
| So suppose we have a model Author which has_many Book | |
| expect(author.books).to equal author.books | |
| If Book has a scope, say by_countries: | |
| scope :by_countries, -> c { where(countries: c) if c.present? } | |
| scoped queries are not cached: | |
| expect(author.books.by_countries(nil)).not_to equal author.books.by_countries(nil) |
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