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without_instanciation
On large results of ActiveRecord queries, instanciation + GC of objects has a real cost of
allocating memory, setting values, and after all GC garbage ...
Inside a without_instanciation block, data is returned as hash of values.
Objects instanciation process id skipped and though GC of theses objects too.
Performance up to 80% for large query result.
Of course, you no longer work with Ruby AR objects in this block.
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