app.rb

require 'json'

file = File.read('data.json')
data_hash = JSON.parse(file)
data = data_hash['properties'].sort_by{ |e| e['id'].to_i }

class Property
  attr_accessor :id, :group, :colour, :name, :price, :rent, :house_price, :mortage

  def initialize(params = {})
    @id = params[:id]
    @group = params[:group]
    @colour = params[:colour]
    @name = params[:name]
    @price = params[:price]
    @rent = params[:rent]
    @house_price = params[:house_price]
    @mortage = params[:mortage]
  end
end

a = Property.new(
 id: 1,
 group: 'property',
 colour: 'brown',
 name: 'Parkveien',
 price: 1200,
 rent: [40, 200, 600, 1800, 3200, 5000],
 house_price: 1000,
 mortage: 600
)

data.json

{
  "properties": [
      {"id": 0, "group": "property","colour": "brown","name": "Parkveien", "price": 1200, "rent": [40, 200, 600, 1800, 3200, 5000], "house_price": 1000, "mortage": 600},
      {"id": 1, "group": "property","colour": "brown","name": "Kirkeveien", "price": 1200, "rent": [80, 400, 1200, 3600, 6400, 9000], "house_price": 1000, "mortage": 600},
      {"id": 2, "group": "train","colour": "white","name": "Oslo Sentralstasjon", "price": 4000, "rent": [500, 1000, 2000, 4000], "mortage": 2000},
      {"id": 3, "group": "property","colour": "blue","name": "Kongens Gate", "price": 2000, "rent": [120, 600, 1800, 5400, 8000, 11000], "house_price": 1000, "mortage": 1000},
      {"id": 4, "group": "property","colour": "blue","name": "Prinsens Gate", "price": 2000, "rent": [120, 600, 1800, 5400, 8000, 11000], "house_price": 1000, "mortage": 1000},
      {"id": 5, "group": "property","colour": "blue","name": "Øvre Slottsgate", "price": 2400, "rent": [160, 800, 2000, 6000, 9000, 12000], "house_price": 1000, "mortage": 1200},
      {"id": 6, "group": "property","colour": "pink","name": "Nedre Slottsgate", "price": 2800, "rent": [200, 1000, 3000, 9000, 12500, 15000], "house_price": 2000, "mortage": 1400},
      {"id": 7, "group": "energy","colour": "white","name": "Oslo Lysverk", "price": 3000, "rent": [80, 200], "mortage": 1500},
      {"id": 8, "group": "property","colour": "pink","name": "Trondheimsveien", "price": 2800, "rent": [200, 1000, 3000, 9000, 12500, 15000], "house_price": 2000, "mortage": 1400},
      {"id": 9, "group": "property","colour": "pink","name": "Nobels Gate", "price": 3200, "rent": [240, 1200, 3600, 10000, 14000, 18000], "house_price": 2000, "mortage": 1600},
      {"id": 10, "group": "train","colour": "white","name": "Skøyen Stasjon", "price": 4000, "rent": [500, 1000, 2000, 4000], "mortage": 2000},
      {"id": 11, "group": "property","colour": "orange","name": "Grensen", "price": 3600, "rent": [280, 1400, 4000, 11000, 15000, 19000], "house_price": 2000, "mortage": 1800},
      {"id": 12, "group": "property","colour": "orange","name": "Gabels Gate", "price": 3600, "rent": [280, 1400, 4000, 11000, 15000, 19000], "house_price": 2000, "mortage": 1800},
      {"id": 13, "group": "property","colour": "orange","name": "Ringgata", "price": 4000, "rent": [320, 1600, 4400, 12000, 16000, 20000], "house_price": 2000, "mortage": 2000},
      {"id": 14, "group": "property","colour": "red","name": "Bygdøy Alle", "price": 4400, "rent": [360, 1800, 5000, 14000, 17500, 21000], "house_price": 3000, "mortage": 2200},
      {"id": 15, "group": "property","colour": "red","name": "Skarpsno", "price": 4000, "rent": [360, 1800, 5000, 14000, 17500, 21000], "house_price": 3000, "mortage": 2200},
      {"id": 16, "group": "property","colour": "red","name": "Slemdal", "price": 4800, "rent": [400, 2000, 6000, 15000, 18500, 22000], "house_price": 3000, "mortage": 2400},
      {"id": 17, "group": "train","colour": "white","name": "Grorud Stasjon", "price": 4000, "rent": [500, 1000, 2000, 4000], "mortage": 2000},
      {"id": 18, "group": "property","colour": "yellow","name": "Karl Johans Gate", "price": 5200, "rent": [440, 2200, 6600, 16000, 19500, 23000], "house_price": 3000, "mortage": 2600},
      {"id": 19, "group": "property","colour": "yellow","name": "Stortorget", "price": 5200, "rent": [440, 2200, 6600, 16000, 19500, 23000], "house_price": 3000, "mortage": 2600},
      {"id": 20, "group": "energy","colour": "white","name": "Vannverket", "price": 3000, "rent": [80, 200], "mortage": 1500},
      {"id": 21, "group": "property","colour": "yellow","name": "Torggata", "price": 5600, "rent": [480, 2400, 7200, 17000, 20500, 24000], "house_price": 3000, "mortage": 2600},
      {"id": 22, "group": "property","colour": "green","name": "Trosterudveien", "price": 6000, "rent": [520, 2600, 7800, 18000, 22000, 25500], "house_price": 4000, "mortage": 3000},
      {"id": 23, "group": "property","colour": "green","name": "Pilestredet", "price": 6000, "rent": [520, 2600, 7800, 18000, 22000, 25500], "house_price": 4000, "mortage": 3000},
      {"id": 24, "group": "property","colour": "green","name": "Sinsen", "price": 6400, "rent": [560, 3000, 9000, 20000, 24000, 280000], "house_price": 4000, "mortage": 3000},
      {"id": 25, "group": "train","colour": "white","name": "Bryn Stasjon", "price": 4000, "rent": [500, 1000, 2000, 4000], "mortage": 2000},
      {"id": 26, "group": "property","colour": "dark-blue","name": "Ullevål Hageby", "price": 7000, "rent": [700, 3500, 10000, 22000, 26000, 30000], "house_price": 4000, "mortage": 3500},
      {"id": 27, "group": "property","colour": "dark-blue","name": "Rådhusplassen", "price": 8000, "rent": [1000, 4000, 12000, 28000, 34000, 40000], "house_price": 4000, "mortage": 4000}
    ]
}