Sorting a hash using a method from the corresponding model

Question

Let's say you have a model Dog with an attribute "age" a method that determines "barking frequency":

class Dog < ActiveRecord::Base
  scope by_age, -> { order('age ASC') }

  def barking_frequency
    # some code
  end
end

In your controller you have:

def index
  @dogs = Dog.by_age
end

Once you have the hash for @dogs, how can you sort it by barking_frequency, so that the result keeps the dogs of a particular age sorted together, like this:

Name    Age   Barking Frequency
Molly    2    1
Buster   2    4
Jackie   2    7
Dirk     3    1
Hank     3    3
Jake     3    4
Spot     10   0

score 2 · Accepted Answer · answered Sep 18 '14 at 18:22

2

Below will work:

def index
  @dogs = Dog.by_age.sort_by { |dog| [dog.age, dog.barking_frequency] }
end

answered Sep 18 '14 at 18:22

Arup Rakshit

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1

Isn't that beautiful? – Patrice Gahide Sep 18 '14 at 19:04
@PatriceGahide Means ? ;) – Arup Rakshit Sep 19 '14 at 03:06
1

Sorry, I'm still astounded by how beautiful and simple Ruby code can be sometimes, and I was just writing my toughts ;) – Patrice Gahide Sep 19 '14 at 06:08
@PatriceGahide Thanks for appreciating.. :-) – Arup Rakshit Sep 19 '14 at 06:18

Sorting a hash using a method from the corresponding model

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