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jbranchaud
2024-11-02 13:47:16 -05:00
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rails/prefer-select-all-over-execute-for-read-queries.md
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@@ -35,10 +35,19 @@ result = ActiveRecord::Base.connection.select_all(books_by_status_query)
``` ```
It has the advantage of semantically communicating that it's just a read and It has the advantage of semantically communicating that it's just a read and
won't have any side-effects. won't have any side-effects. It also avoids an unnecessary clear of the query
cache.
> Note: the query is assumed to have side effects and the query cache will be > Note: [when execute is used] the query is assumed to have side effects and
> cleared. If the query is read-only, consider using select_all instead. > the query cache will be cleared. If the query is read-only, consider using
> select_all instead.
The `#execute` method also has been known to leak memory with some database
connectors.
> Note: depending on your database connector, the result returned by this
> method may be manually memory managed. Consider using exec_query wrapper
> instead.
We can then iterate through and transform the results just as we would have We can then iterate through and transform the results just as we would have
done with `#execute`. done with `#execute`.