CODEWITHSUNDEEP
rubyloopseach
user8142520
user8142520

Reputation: 781

Best way to iterate a list of hash in ruby

I have data structure like List< HashMap< String, List>>:

records = [{"1"=>[{"account_id"=>"1", "v"=>"1"}, {"account_id"=>"1", "v"=>"2"}, {"account_id"=>"1", "v"=>"3"}, {"account_id"=>"1", "v"=>"4"]}, {"2"=>[{"account_id"=>"2", "v"=>"4"}, {"account_id"=>"2", "v"=>"4"}, {"account_id"=>"2", "v"=>"4"}]}]

I don't care about the keys in hashmap ("1" and "2" in this case), and want to iterate values of map by group:

records.each do |account_map| 
    account_record = account_map.values[0] # This line
        for i in (0 ... account_record.size - 1)
            #do something and update account_record[i]
        end
    end
end

How can I merge account_record = account_map.values[0] into each loop or make it look better. Thanks

Upvotes: 0

Views: 1811

Answers (1)

Jeremie Zazoun
Jeremie Zazoun

Reputation: 144

Your example is quite confusing, but the regular way to iterate a hash is the following

hash.each do |key, value|
end

So in your example it looks like you should do

records.each do |account_map| 
    account_map.each do |index, array|
        array.each do |hash|
            hash['account_id'] # This is how you access your data
            hash['v']          # This is how you access your data
        end
    end
end

Of course you should use better variables names than index, array and hash.

Upvotes: 2

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