Events: make 'title' a required field

app/models/event.rb

@@ -15,6 +15,7 @@ class Event < ActiveRecord::Base
   # suggestion from Nicholas
   to_param :title
 
+  validates :title, presence: true
   validates :starts_at, presence: true
 
   def self.published

db/migrate/20140929233719_create_events.rb

@@ -5,7 +5,7 @@ def up
       t.datetime :starts_at, null: false
       t.timestamps
     end
-    Event.create_translation_table! :title => :string, :introduction => :text, :conclusion => :text
+    Event.create_translation_table! title: {type: :string, null: false}, introduction: :text, conclusion: :text
   end
 
   def down

db/schema.rb

@@ -21,7 +21,7 @@
     t.string   "locale",       null: false
     t.datetime "created_at",   null: false
     t.datetime "updated_at",   null: false
-    t.string   "title"
+    t.string   "title",        null: false
     t.text     "introduction"
     t.text     "conclusion"
   end

spec/models/event_spec.rb

@@ -9,16 +9,21 @@
 #  updated_at :datetime
 #
 
-require 'rails_helper'
+require "rails_helper"
 
 RSpec.describe Event, :type => :model do
 
-  describe 'attribute validations' do
-    it 'does not validate when starts_at is not defined' do
+  describe "attribute validations" do
+    it "does not validate when 'starts_at' is not defined" do
       event = Event.new(starts_at: nil)
-      expect(event).to_not be_valid
+      expect(event).to be_invalid
       expect(event.errors.messages.keys).to include :starts_at
     end
-  end
 
+    it "does not validate when 'title' is not defined" do
+      event = Event.new(title: nil)
+      expect(event).to be_invalid
+      expect(event.errors.messages.keys).to include :title
+    end
+  end
 end