CODEWITHSUNDEEP
arraysrubysorting
jpw
jpw

Reputation: 19257

How to sort an array of hashes in ruby

I have an array, each of whose elements is a hash with three key/value pairs:

:phone => "2130001111", :zip => "12345", :city => "sometown"

I'd like to sort the data by zip so all the phones in the same area are together. Does Ruby have an easy way to do that? Can will_paginate paginate data in an array?

Upvotes: 188

Views: 116417

Answers (5)

abhilashak
abhilashak

Reputation: 3621

If you have Nested Hash (Hash inside a hash format) as Array elements (a structure like the following) and want to sort it by key (date here)

data =  [
    {
        "2018-11-13": {
            "avg_score": 4,
            "avg_duration": 29.24
        }
    },
    {
         "2017-03-13": {
            "avg_score": 4,
            "avg_duration": 40.24
        }
    },
    {
         "2018-03-13": {
            "avg_score": 4,
            "avg_duration": 39.24
        }
    }
]

Use Array 'sort_by' method as

data.sort_by { |element| element.keys.first }

Upvotes: 5

Diego D
Diego D

Reputation: 1776

Use the bang to modify in place the array:

array_of_hashes.sort_by!(&:zip)

Or re-assign it:

array_of_hashes = array_of_hashes.sort_by(&:zip)

Note that sort_by method will sort by ascending order.

If you need to sort with descending order you could do something like this:

array_of_hashes.sort_by!(&:zip).reverse!

or

array_of_hashes = array_of_hashes.sort_by(&:zip).reverse

Upvotes: 19

Gareth
Gareth

Reputation: 138210

Simples:

array_of_hashes.sort_by { |hsh| hsh[:zip] }

Note:

When using sort_by you need to assign the result to a new variable: array_of_hashes = array_of_hashes.sort_by{} otherwise you can use the "bang" method to modify in place: array_of_hashes.sort_by!{}

Upvotes: 432

taivn07
taivn07

Reputation: 39

If you want to paginate for data in array you should require 'will_paginate/array' in your controller

Upvotes: 3

Edu
Edu

Reputation: 1969

sorted = dataarray.sort {|a,b| a[:zip] <=> b[:zip]}

Upvotes: 19

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