New concept! Foreign key constraints. On database!

Gemfile

@@ -32,6 +32,7 @@ gem 'rack-robustness',      '~> 1.1.0'
 gem 'rack-rewrite',         '~> 1.5.0'
 gem 'oj',                   '~> 2.11'
 gem 'oj_mimic_json',        '~> 1.0'
+gem 'foreigner',            '~> 1.7'
 
 group :development do
   gem 'quiet_assets',   '~> 1.0.1'
@@ -40,6 +41,7 @@ group :development do
   gem 'foreman',        '~> 0.63.0'
   gem 'spring'
   gem 'spring-commands-rspec'
+  gem 'immigrant'
 end
 
 group :test, :development do

Gemfile.lock

@@ -112,6 +112,8 @@ GEM
       net-ssh (>= 2.1.3)
       nokogiri (~> 1.5.0)
       ruby-hmac
+    foreigner (1.7.2)
+      activerecord (>= 3.0.0)
     foreman (0.63.0)
       dotenv (>= 0.7)
       thor (>= 0.13.6)
@@ -132,6 +134,8 @@ GEM
       multi_xml (>= 0.5.2)
     i18n (0.6.11)
     ice_nine (0.11.0)
+    immigrant (0.3.1)
+      activerecord (>= 3.0)
     jasmine-core (1.3.1)
     jasmine-rails (0.4.5)
       jasmine-core (~> 1.3)
@@ -353,9 +357,11 @@ DEPENDENCIES
   draper (~> 1.3.1)
   factory_girl_rails (~> 4.2.0)
   fog (~> 1.9.0)
+  foreigner (~> 1.7)
   foreman (~> 0.63.0)
   guard
   guard-rspec
+  immigrant
   jasmine-rails (~> 0.4.5)
   jquery-rails (~> 3.0.4)
   kaminari (~> 0.14.1)

app/models/asciicast.rb

@@ -11,15 +11,15 @@ class Asciicast < ActiveRecord::Base
 
   serialize :snapshot, ActiveSupportJsonProxy
 
+  belongs_to :user
+  has_many :comments, -> { order(:created_at) }, dependent: :destroy
+  has_many :likes, dependent: :destroy
+
+  validates :user, :terminal_columns, :terminal_lines, :duration, presence: true
   validates :stdout_data, :stdout_timing, presence: true, unless: :file
   validates :file, presence: true, unless: :stdout_data
-  validates :terminal_columns, :terminal_lines, :duration, :presence => true
   validates :snapshot_at, numericality: { greater_than: 0, allow_blank: true }
 
-  belongs_to :user
-  has_many :comments, -> { order(:created_at) }, :dependent => :destroy
-  has_many :likes, :dependent => :destroy
-
   scope :featured, -> { where(featured: true) }
   scope :by_recency, -> { order("created_at DESC") }
   scope :by_random, -> { order("RANDOM()") }

db/migrate/20150311094819_add_keys.rb

@@ -0,0 +1,11 @@
+class AddKeys < ActiveRecord::Migration
+  def change
+    add_foreign_key "api_tokens", "users", name: "api_tokens_user_id_fk"
+    add_foreign_key "asciicasts", "users", name: "asciicasts_user_id_fk"
+    add_foreign_key "comments", "asciicasts", name: "comments_asciicast_id_fk"
+    add_foreign_key "comments", "users", name: "comments_user_id_fk"
+    add_foreign_key "expiring_tokens", "users", name: "expiring_tokens_user_id_fk"
+    add_foreign_key "likes", "asciicasts", name: "likes_asciicast_id_fk"
+    add_foreign_key "likes", "users", name: "likes_user_id_fk"
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20150228174314) do
+ActiveRecord::Schema.define(version: 20150311094819) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -115,4 +115,16 @@ ActiveRecord::Schema.define(version: 20150228174314) do
   add_index "users", ["provider", "uid"], name: "index_users_on_provider_and_uid", unique: true, using: :btree
   add_index "users", ["username"], name: "index_users_on_username", using: :btree
 
+  add_foreign_key "api_tokens", "users", name: "api_tokens_user_id_fk"
+
+  add_foreign_key "asciicasts", "users", name: "asciicasts_user_id_fk"
+
+  add_foreign_key "comments", "asciicasts", name: "comments_asciicast_id_fk"
+  add_foreign_key "comments", "users", name: "comments_user_id_fk"
+
+  add_foreign_key "expiring_tokens", "users", name: "expiring_tokens_user_id_fk"
+
+  add_foreign_key "likes", "asciicasts", name: "likes_asciicast_id_fk"
+  add_foreign_key "likes", "users", name: "likes_user_id_fk"
+
 end