CODEWITHSUNDEEP
ruby-on-railsrubyhash
JNI_OnLoad
JNI_OnLoad

Reputation: 5442

appending values in key/value hash in ruby

I am trying to append values in hash specific to particular key and value and then sort them based on values. So here is what I am trying to do

 @arr = Hash.new
 $m.each do |s|
  if (s.start.hour == check.hour)
    if params[:type] == 'A'
      s.As.each do |w|
          @arr['name'].push((w.name))
          @arr['id'].push((w.id).to_i)
      end
    end
  end
end

It is obvious that I will get only last value but I could not find out how to append these values for this hash. Not much familiar with ruby so help appreciated on this and some idea how to sort the created hash with respect to 'id's in @arr

Links that I have already tried 1 2

Upvotes: 0

Views: 192

Answers (1)

Matt
Matt

Reputation: 74680

For your requirements, you are using the Hash in way that makes more work later. Your current data structure will look like this:

{ 
  id:   [ 1, 2, 3 ],
  name: [ a, b, c ] 
}

Which means you have to use arrays and indexes to sort and line up the id and name.

Hash's support what you are trying to achieve out of the box if you restructure it to use the id as a key:

{ 
  1: { name: a },
  2: { name: b },
  3: { name: c }
}

To do this you can assign values to the Hash in your loop like so: 

@arr[w.id.to_i] = { "name" => w.name }

Then your Hash can be accessed, in order with:

@arr.sort.map do |id, value|
  # work with id and value["name"]
end

Reiterating what Mark Thomas noted, use a meaningful name for the Hash instead of @arr as that only adds confusion.

Upvotes: 2

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