Ruby on Rails: Model.all.each vs find_by_sql("SELECT * FROM model").each ?

Posted by B_ on Stack Overflow See other posts from Stack Overflow or by B_
Published on 2010-03-30T02:23:27Z Indexed on 2010/03/30 8:23 UTC
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I'm fairly new to RoR. In my controller, I'm iterating over every tuple in the database. For every table, for every column I used to call

SomeOtherModel.find_by_sql("SELECT column FROM model").each {|x| #etc }

which worked fine enough. When I later changed this to

Model.all(:select => "column").each {|x| #etc }

the loop starts out at roughly the same speed but quickly slows down to something like 100 times slower than the the find_by_sql command. These calls should be identical so I really don't know what's happening.

I know these calls are not the most efficient but this is just an intermediate step and I will optimize it more once this works correctly.

Thanks!

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