Add column FederalSubject#number

app/models/federal_subject.rb

@@ -27,6 +27,11 @@ class FederalSubject < ApplicationRecord
 
   validates :native_name, presence: true, uniqueness: true
 
+  validates :number,
+            presence: true,
+            uniqueness: true,
+            numericality: { only_integer: true, greater_than: 0 }
+
   ###########
   # Methods #
   ###########

db/migrate/20190719224405_add_number_to_federal_subjects.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class AddNumberToFederalSubjects < ActiveRecord::Migration[6.0]
+  def change
+    # rubocop:disable Rails/NotNullColumn
+    add_column :federal_subjects, :number, :integer, null: false
+    add_index  :federal_subjects, :number, unique: true
+    # rubocop:enable Rails/NotNullColumn
+  end
+end

db/seeds.rb

@@ -5,14 +5,16 @@ require 'csv'
 federal_subjects_filename = Rails.root.join 'config', 'federal_subjects.csv'
 
 CSV.foreach federal_subjects_filename,
-            col_sep: '|' do |(id, english_name, native_name, _number)|
+            col_sep: '|' do |(id, english_name, native_name, number)|
   id = Integer(id.strip)
   english_name.strip!
   native_name.strip!
+  number = Integer(number.strip.sub(/\A0*/, ''))
 
   FederalSubject.where(id: id).first_or_create! do |new_federal_subject|
     new_federal_subject.english_name = english_name
     new_federal_subject.native_name = native_name
+    new_federal_subject.number = number
   end
 end
 

db/structure.sql

@@ -219,7 +219,8 @@ CREATE TABLE public.federal_subjects (
     created_at timestamp without time zone NOT NULL,
     updated_at timestamp without time zone NOT NULL,
     english_name character varying NOT NULL,
-    native_name character varying NOT NULL
+    native_name character varying NOT NULL,
+    number integer NOT NULL
 );
 
 
@@ -834,6 +835,13 @@ CREATE UNIQUE INDEX index_federal_subjects_on_english_name ON public.federal_sub
 CREATE UNIQUE INDEX index_federal_subjects_on_native_name ON public.federal_subjects USING btree (native_name);
 
 
+--
+-- Name: index_federal_subjects_on_number; Type: INDEX; Schema: public; Owner: -
+--
+
+CREATE UNIQUE INDEX index_federal_subjects_on_number ON public.federal_subjects USING btree (number);
+
+
 --
 -- Name: index_passports_on_person_id; Type: INDEX; Schema: public; Owner: -
 --
@@ -1158,6 +1166,7 @@ INSERT INTO "schema_migrations" (version) VALUES
 ('20190715210610'),
 ('20190718181335'),
 ('20190718184543'),
-('20190719024630');
+('20190719024630'),
+('20190719224405');
 
 

factories/federal_subjects.rb

@@ -13,5 +13,7 @@ FactoryBot.define do
     end
 
     native_name { english_name }
+
+    sequence :number
   end
 end

spec/models/federal_subject_spec.rb

@@ -15,9 +15,18 @@ RSpec.describe FederalSubject do
 
   it { is_expected.to validate_presence_of :english_name }
   it { is_expected.to validate_presence_of :native_name }
+  it { is_expected.to validate_presence_of :number }
 
   it { is_expected.to validate_uniqueness_of :english_name }
   it { is_expected.to validate_uniqueness_of :native_name }
+  it { is_expected.to validate_uniqueness_of :number }
+
+  it do
+    is_expected.to \
+      validate_numericality_of(:number)
+      .only_integer
+      .is_greater_than(0)
+  end
 
   describe '.order_by_display_name' do
     let! :federal_subject_1 do