Relax Rails dependency to allow 5.1

test-app/db/migrate/20160218212104_create_blogs.rb

@@ -1,4 +1,10 @@
-class CreateBlogs < ActiveRecord::Migration
+migration_class = if Gem::Version.new(Rails.version) >= Gem::Version.new("5.0")
+                    ActiveRecord::Migration[4.2]
+                  else
+                    ActiveRecord::Migration
+                  end
+
+class CreateBlogs < migration_class
   def change
     create_table :blogs do |t|
       t.string :title

test-app/db/schema.rb

@@ -1,4 +1,3 @@
-# encoding: UTF-8
 # This file is auto-generated from the current state of the database. Instead
 # of editing this file, please use the migrations feature of Active Record to
 # incrementally modify your database, and then regenerate this schema definition.
@@ -9,15 +8,15 @@
 # from scratch. The latter is a flawed and unsustainable approach (the more migrations
 # you'll amass, the slower it'll run and the greater likelihood for issues).
 #
-# It's strongly recommended to check this file into your version control system.
+# It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20160218212104) do
+ActiveRecord::Schema.define(version: 20160218212104) do
 
-  create_table "blogs", :force => true do |t|
-    t.string   "title"
-    t.text     "content"
-    t.datetime "created_at", :null => false
-    t.datetime "updated_at", :null => false
+  create_table "blogs", force: :cascade do |t|
+    t.string "title"
+    t.text "content"
+    t.datetime "created_at"
+    t.datetime "updated_at"
   end
 
 end