ActiveRecord: size vs count

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You should read that, it’s still valid.

You’ll adapt the function you use depending on your needs.

Basically:

  • if you already load all entries, say User.all, then you should use length to avoid another db query

  • if you haven’t anything loaded, use count to make a count query on your db

  • if you don’t want to bother with these considerations, use size which will adapt

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