Reference between movies and directors.

db/migrate/20160414053806_add_director_id_to_movies.rb

@@ -0,0 +1,5 @@
+class AddDirectorIdToMovies < ActiveRecord::Migration
+  def change
+    add_reference :movies, :director, index: true, foreign_key: true
+  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: 20160414052838) do
+ActiveRecord::Schema.define(version: 20160414053806) do
 
   create_table "directors", force: :cascade do |t|
     t.string   "first_name"
@@ -25,8 +25,11 @@
     t.string   "title"
     t.integer  "year"
     t.text     "synopsis"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
+    t.datetime "created_at",  null: false
+    t.datetime "updated_at",  null: false
+    t.integer  "director_id"
   end
 
+  add_index "movies", ["director_id"], name: "index_movies_on_director_id"
+
 end

log/development.log

@@ -1514,3 +1514,20 @@ Migrating to CreateDirectors (20160414052838)
   SQL (0.2ms)  INSERT INTO "schema_migrations" ("version") VALUES (?)  [["version", "20160414052838"]]
    (1.6ms)  commit transaction
   ActiveRecord::SchemaMigration Load (0.1ms)  SELECT "schema_migrations".* FROM "schema_migrations"
+  ActiveRecord::SchemaMigration Load (1.8ms)  SELECT "schema_migrations".* FROM "schema_migrations"
+Migrating to AddDirectorIdToMovies (20160414053806)
+   (0.1ms)  begin transaction
+   (0.6ms)  ALTER TABLE "movies" ADD "director_id" integer
+   (0.1ms)  select sqlite_version(*)
+   (0.4ms)  CREATE  INDEX "index_movies_on_director_id" ON "movies" ("director_id")
+  SQL (0.3ms)  INSERT INTO "schema_migrations" ("version") VALUES (?)  [["version", "20160414053806"]]
+   (0.8ms)  commit transaction
+  ActiveRecord::SchemaMigration Load (0.1ms)  SELECT "schema_migrations".* FROM "schema_migrations"
+   (0.2ms)              SELECT sql
+            FROM sqlite_master
+            WHERE name='index_movies_on_director_id' AND type='index'
+            UNION ALL
+            SELECT sql
+            FROM sqlite_temp_master
+            WHERE name='index_movies_on_director_id' AND type='index'
+