Create association of translations with their problems

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: 20141214220056) do
+ActiveRecord::Schema.define(version: 20141214221259) do
 
   create_table "problems", force: true do |t|
     t.datetime "created_at"
@@ -26,6 +26,9 @@ ActiveRecord::Schema.define(version: 20141214220056) do
     t.text     "content"
     t.datetime "created_at"
     t.datetime "updated_at"
+    t.integer  "problem_id"
   end
 
+  add_index "translations", ["problem_id"], name: "index_translations_on_problem_id"
+
 end