How to sort an array of hashes in ruby

Question

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

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


        

Answer 1

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

Answer 2

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!{}

Answer 3

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 }

Answer 4

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

Answer 5

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