How to sort not simple hash (hash of hashes)

Question

I have a Hash like this

{ 55 => {:value=>61, :rating=>-147},
  89 => {:value=>72, :rating=>-175},
  78 => {:value=>64, :rating=>-155},         


        

Answer 1

I would change the data structure to an array of hashes:

my_array =
[
  {:id => 78, :value=>64, :rating=>-155},
  {:id => 84, :value=>90, :rating=>-220},
  {:id => 95, :value=>39, :rating=>-92}
]

You can sort this kind of structure easily with

my_array.sort_by { |record| record[:rating] }

To get the hash-like functionality of fetching a record by id you can define a new method on my_array:

def my_array.find_by_id(id) 
  self.find { |hash| hash[:id] == id }
end

so after that you can do

my_array.find_by_id(id)

instead of

my_hash[id]