[Rails] How to store the same key multi times in a Hash ?

given an Arra tags[]

I need to produce a resulting Hash as following ..

{ "$in" => [tags[0]], "$in" =>[tags[1], ...}

in which the key should be always the same and the value being an
Array

I tried this :

myHash = {}
tags.each do |tag|
h = {"$in" => [tag]}
myHash.merge!(h)
end

but the merge! is only changing the value ... (as the key is always
the same ..)
(there is no += as with Array class ...)

thanks for your feedback

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