Rails - Nov 2014 - How to find the count of the associated models with less number of queries being executed?

I have a rails app where I need to take count of the associated model like 
post.comments.count and this loads up number of queries and I was searching 
for option to reduce this and found counter cache which saves the count in 
the table but is there any other option to find the count without saving in 
the table?

Thanks in advance.

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