modify mission status from string to int

db/migrate/20161228052102_modify_missions_status_from_string_to_int.rb

@@ -0,0 +1,5 @@
+class ModifyMissionsStatusFromStringToInt < ActiveRecord::Migration
+  def change
+    change_column :missions, :status, :integer
+  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: 20161228045935) do
+ActiveRecord::Schema.define(version: 20161228052102) do
 
   create_table "comments", force: :cascade do |t|
     t.text     "content"
@@ -26,7 +26,7 @@ ActiveRecord::Schema.define(version: 20161228045935) do
     t.string   "name"
     t.datetime "deadline"
     t.integer  "priority"
-    t.string   "status"
+    t.integer  "status"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.string   "content"