Ruby on Rails

Hello,

I know in ruby that when you want to find the size of your query say

[1,2,3,4,5,6] would provide 6 as the total size, length, or even count.

When I try to use size, length, or count on my application, I would get
a pretty darn slow performance (takes around 10 seconds to load each
count and I do it twice). Is there another faster way to get the total
size from the postgres query?

I am using this kind of format in database

e.g: table population [id, race id]
table race [id, persons id]
table persons[id, likes]

so if I use "population.race.persons.count" I would get the total size
of the persons in that particular race and population.

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