Ruby - Sort by array of hashes

Question

I have this array of hashes:

@fournisseurs = [
{ id: 10592,
  nom: 'Carrossier Procolor Armand-Paris (Garage Michel Tondreau)',
  distance: '3.9 km',
  dispos: nil
},
{ id: 10463,
  nom: 'Carrossier Procolor Grand Beauport(Garage Michel Tondreau)',
  distance: '3.8 km',
  dispos: nil
}, 
{ id: 10594,
  nom: 'Honda Charlesbourg',
  distance: '5.2 km',
  dispos: nil
}, 
{ id: 10508,
  nom: 'Carrossier ProColor Charlesbourg',
  distance: '15.5 km',
  dispos: nil
}]

And I would like to sort it by distance. I tried @fournisseurs.sort_by! { |fournisseur| fournisseur[:distance]}, but it doesn't sort my array of hashes. I read that sort_by!was unstable. How can I do that?

Thanks in advance !

Possible duplicate of How to sort an array of hashes in ruby — Joseph Cho
– Joseph Cho, Commented Jun 5, 2018 at 13:26
@JosephCho I checked this post, and it didn't help me cause I did the same and it doesn't sort my array of hashes... — Noémie Harvey
– Noémie Harvey, Commented Jun 5, 2018 at 13:32
@Stefan I don't get a error message, but it doesn't sort my array of hashes. — Noémie Harvey
– Noémie Harvey, Commented Jun 5, 2018 at 13:33
@NoémieHarvey thanks for the edit and the clarification. Unfortunately, that hash is invalid and would result in a SyntaxError. For example, it should be :id => ... or "id" => ... – same for the values. Without a working hash, it's unclear what's causing the problem. — Stefan
– Stefan, Commented Jun 5, 2018 at 13:33

Stefan · Accepted Answer · 2018-06-05 13:48:33Z

6

Assuming that each distance is given as a string, you need to convert it to a float to effectively sort by distance.

@fournisseurs = [
{ id: 10592,
  nom: 'Carrossier Procolor Armand-Paris (Garage Michel Tondreau)',
  distance: '3.9 km',
  dispos: nil
},
{ id: 10463,
  nom: 'Carrossier Procolor Grand Beauport(Garage Michel Tondreau)',
  distance: '3.8 km',
  dispos: nil
}, 
{ id: 10594,
  nom: 'Honda Charlesbourg',
  distance: '5.2 km',
  dispos: nil
}, 
{ id: 10508,
  nom: 'Carrossier ProColor Charlesbourg',
  distance: '15.5 km',
  dispos: nil
}]


@fournisseurs.sort_by! { |f| f[:distance].to_f}


puts @fournisseurs.inspect

edited Jun 5, 2018 at 13:48

Stefan

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answered Jun 5, 2018 at 13:36

Stefan

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3 Comments

Stefan Over a year ago

You don't have to split – to_f ignores tailing characters, i.e. '3.9 km'.to_f returns 3.9.

Stefan Over a year ago

@Stefan, fixed.

Stefan Over a year ago

"@Stefan, fixed. – Stefan" – that has a nice schizophrenic touch 🙃

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