Create Problem model with reference to current translation

app/models/problem.rb

@@ -0,0 +1,3 @@
+class Problem < ActiveRecord::Base
+  has_one :translation
+end

db/migrate/20141214214958_create_problems_again.rb

@@ -0,0 +1,7 @@
+class CreateProblemsAgain < ActiveRecord::Migration
+  def change
+    create_table :problems do |t|
+      t.timestamps
+    end
+  end
+end

db/migrate/20141214220056_add_translation_to_problem.rb

@@ -0,0 +1,5 @@
+class AddTranslationToProblem < ActiveRecord::Migration
+  def change
+    add_reference :problems, :translation, index: true
+  end
+end

db/schema.rb

@@ -11,7 +11,15 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20141213151812) do
+ActiveRecord::Schema.define(version: 20141214220056) do
+
+  create_table "problems", force: true do |t|
+    t.datetime "created_at"
+    t.datetime "updated_at"
+    t.integer  "translation_id"
+  end
+
+  add_index "problems", ["translation_id"], name: "index_problems_on_translation_id"
 
   create_table "translations", force: true do |t|
     t.string   "title"

test/fixtures/problems.yml

@@ -0,0 +1,7 @@
+# Read about fixtures at http://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  Translation_id: 
+
+two:
+  Translation_id: 

test/models/problem_test.rb

@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class ProblemTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end