I agree with Frederick Cheung.
Your code will be like this :
myHashes = []
tags.each do |tag|
h = {"$in" => [tag]}
myHash << h
end
and myHashes will contains :
[{ "$in" => [tags[0]]}, {"$in" =>[tags[1]}, ...]
which myHashes is an array of hashes.
Hope this can help you :)
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