How to sort a hash table with Ruby on Rails?

Question

I'm trying to sort my data as a timeline:

[
  {
    "date": "1996-07-16T08:26:01 -02:00",
    "isPublished": false,
    "events": [
      {
        "title": "occaecat aliqua dolor sint",
        "text": "Laboris nisi dolor ipsum pariatur veniam esse.",
        "picture": "http://placehold.it/32x32",
        "isPublished": true,
        "tags": [
          "elit",
          "incididunt",
          "consectetur"
        ]
      },
      ...
  },
  {
    "date": "1989-09-27T01:46:10 -01:00",
    "isPublished": false,
    "events": [
      {
        "title": "reprehenderit excepteur id minim",
        "text": "Commodo id officia est irure proident duis. Occaecat",
        "picture": "http://placehold.it/32x32",
        "isPublished": false,
        "tags": [
          "ex",
          "occaecat",
          "commodo"
        ]
      },
      ..
  }
]

After reading some answers here on SO, I came with this so far:

class PagesController < ApplicationController
  require 'httparty'
  def index
    response = HTTParty.get('https://raw.githubusercontent.com/valterhenrique/timeliner-sample/master/sample-data.json')
    @dates = JSON.parse(response.body)
    @sorted_dates = @dates.sort_by {|s| Date.strptime(s, '%Y-%m-%d')}
    puts @new_dates
  end
  ...
end

But I had no success so far. Any idea of how to sort these data by date ?

Aleksei Matiushkin · Accepted Answer · 2017-06-02 10:36:04Z

2

@dates.sort_by { |s| Date.parse(s["date"]) }

The above will produce a Date instance out of the string, that is stored under "date" key in each subsequent hash.

As @yzalavin properly noted in comments, you might want to instantiate DateTime to make the sorting better:

@dates.sort_by { |s| DateTime.parse(s["date"]) }

edited Jun 2, 2017 at 10:36

answered Jun 2, 2017 at 10:33

Aleksei Matiushkin

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3 Comments

yzalavin Over a year ago

Maybe DateTime?

Aleksei Matiushkin Over a year ago

@yzalavin indeed, thanks, I just copied what was in the OP.

Valter Silva Over a year ago

WOW! Thank you sir! The Ruby community is really amazing! I'm new to RoR, and hope to repay your help soon, good sir!

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