diff --git a/db/schema.rb b/db/schema.rb
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -9,112 +9,112 @@
 # 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 => 20161031063337) do
+ActiveRecord::Schema.define(version: 20161031063337) do
 
-  create_table "announcements", :force => true do |t|
+  create_table "announcements", force: :cascade do |t|
     t.string   "author"
     t.text     "body"
     t.boolean  "published"
-    t.datetime "created_at",                      :null => false
-    t.datetime "updated_at",                      :null => false
-    t.boolean  "frontpage",    :default => false
-    t.boolean  "contest_only", :default => false
+    t.datetime "created_at",                   null: false
+    t.datetime "updated_at",                   null: false
+    t.boolean  "frontpage",    default: false
+    t.boolean  "contest_only", default: false
     t.string   "title"
     t.string   "notes"
   end
 
-  create_table "contests", :force => true do |t|
+  create_table "contests", force: :cascade do |t|
     t.string   "title"
     t.boolean  "enabled"
-    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.string   "name"
   end
 
-  create_table "contests_problems", :id => false, :force => true do |t|
+  create_table "contests_problems", id: false, force: :cascade do |t|
     t.integer "contest_id"
     t.integer "problem_id"
   end
 
-  create_table "contests_users", :id => false, :force => true do |t|
+  create_table "contests_users", id: false, force: :cascade do |t|
     t.integer "contest_id"
     t.integer "user_id"
   end
 
-  create_table "countries", :force => true do |t|
+  create_table "countries", force: :cascade do |t|
     t.string   "name"
-    t.datetime "created_at", :null => false
-    t.datetime "updated_at", :null => false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
   end
 
-  create_table "descriptions", :force => true do |t|
+  create_table "descriptions", force: :cascade do |t|
     t.text     "body"
     t.boolean  "markdowned"
-    t.datetime "created_at", :null => false
-    t.datetime "updated_at", :null => false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
   end
 
-  create_table "grader_configurations", :force => true do |t|
+  create_table "grader_configurations", force: :cascade do |t|
     t.string   "key"
     t.string   "value_type"
     t.string   "value"
-    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.text     "description"
   end
 
-  create_table "grader_processes", :force => true do |t|
+  create_table "grader_processes", force: :cascade do |t|
     t.string   "host"
     t.integer  "pid"
     t.string   "mode"
     t.boolean  "active"
-    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  "task_id"
     t.string   "task_type"
     t.boolean  "terminated"
   end
 
-  add_index "grader_processes", ["host", "pid"], :name => "index_grader_processes_on_ip_and_pid"
+  add_index "grader_processes", ["host", "pid"], name: "index_grader_processes_on_ip_and_pid"
 
-  create_table "heart_beats", :force => true do |t|
+  create_table "heart_beats", force: :cascade do |t|
     t.integer  "user_id"
     t.string   "ip_address"
-    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.string   "status"
   end
 
-  add_index "heart_beats", ["updated_at"], :name => "index_heart_beats_on_updated_at"
+  add_index "heart_beats", ["updated_at"], name: "index_heart_beats_on_updated_at"
 
-  create_table "languages", :force => true do |t|
-    t.string "name",        :limit => 10
+  create_table "languages", force: :cascade do |t|
+    t.string "name",        limit: 10
     t.string "pretty_name"
-    t.string "ext",         :limit => 10
+    t.string "ext",         limit: 10
     t.string "common_ext"
   end
 
-  create_table "logins", :force => true do |t|
+  create_table "logins", force: :cascade do |t|
     t.integer  "user_id"
     t.string   "ip_address"
-    t.datetime "created_at", :null => false
-    t.datetime "updated_at", :null => false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
   end
 
-  create_table "messages", :force => true do |t|
+  create_table "messages", force: :cascade do |t|
     t.integer  "sender_id"
     t.integer  "receiver_id"
     t.integer  "replying_message_id"
     t.text     "body"
     t.boolean  "replied"
-    t.datetime "created_at",          :null => false
-    t.datetime "updated_at",          :null => false
+    t.datetime "created_at",          null: false
+    t.datetime "updated_at",          null: false
   end
 
-  create_table "problems", :force => true do |t|
-    t.string  "name",                 :limit => 30
+  create_table "problems", force: :cascade do |t|
+    t.string  "name",                 limit: 30
     t.string  "full_name"
     t.integer "full_score"
     t.date    "date_added"
@@ -126,57 +126,57 @@
     t.string  "description_filename"
   end
 
-  create_table "rights", :force => true do |t|
+  create_table "rights", force: :cascade do |t|
     t.string "name"
     t.string "controller"
     t.string "action"
   end
 
-  create_table "rights_roles", :id => false, :force => true do |t|
+  create_table "rights_roles", id: false, force: :cascade do |t|
     t.integer "right_id"
     t.integer "role_id"
   end
 
-  add_index "rights_roles", ["role_id"], :name => "index_rights_roles_on_role_id"
+  add_index "rights_roles", ["role_id"], name: "index_rights_roles_on_role_id"
 
-  create_table "roles", :force => true do |t|
+  create_table "roles", force: :cascade do |t|
     t.string "name"
   end
 
-  create_table "roles_users", :id => false, :force => true do |t|
+  create_table "roles_users", id: false, force: :cascade do |t|
     t.integer "role_id"
     t.integer "user_id"
   end
 
-  add_index "roles_users", ["user_id"], :name => "index_roles_users_on_user_id"
+  add_index "roles_users", ["user_id"], name: "index_roles_users_on_user_id"
 
-  create_table "sessions", :force => true do |t|
+  create_table "sessions", force: :cascade do |t|
     t.string   "session_id"
     t.text     "data"
     t.datetime "updated_at"
   end
 
-  add_index "sessions", ["session_id"], :name => "index_sessions_on_session_id"
-  add_index "sessions", ["updated_at"], :name => "index_sessions_on_updated_at"
+  add_index "sessions", ["session_id"], name: "index_sessions_on_session_id"
+  add_index "sessions", ["updated_at"], name: "index_sessions_on_updated_at"
 
-  create_table "sites", :force => true do |t|
+  create_table "sites", force: :cascade do |t|
     t.string   "name"
     t.boolean  "started"
     t.datetime "start_time"
-    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  "country_id"
     t.string   "password"
   end
 
-  create_table "submission_view_logs", :force => true do |t|
+  create_table "submission_view_logs", force: :cascade do |t|
     t.integer  "user_id"
     t.integer  "submission_id"
-    t.datetime "created_at",    :null => false
-    t.datetime "updated_at",    :null => false
+    t.datetime "created_at",    null: false
+    t.datetime "updated_at",    null: false
   end
 
-  create_table "submissions", :force => true do |t|
+  create_table "submissions", force: :cascade do |t|
     t.integer  "user_id"
     t.integer  "problem_id"
     t.integer  "language_id"
@@ -196,25 +196,25 @@
     t.string   "ip_address"
   end
 
-  add_index "submissions", ["user_id", "problem_id", "number"], :name => "index_submissions_on_user_id_and_problem_id_and_number", :unique => true
-  add_index "submissions", ["user_id", "problem_id"], :name => "index_submissions_on_user_id_and_problem_id"
+  add_index "submissions", ["user_id", "problem_id", "number"], name: "index_submissions_on_user_id_and_problem_id_and_number", unique: true
+  add_index "submissions", ["user_id", "problem_id"], name: "index_submissions_on_user_id_and_problem_id"
 
-  create_table "tasks", :force => true do |t|
+  create_table "tasks", force: :cascade do |t|
     t.integer  "submission_id"
     t.datetime "created_at"
     t.integer  "status"
     t.datetime "updated_at"
   end
 
-  create_table "test_pairs", :force => true do |t|
+  create_table "test_pairs", force: :cascade do |t|
     t.integer  "problem_id"
-    t.text     "input",      :limit => 16777215
-    t.text     "solution",   :limit => 16777215
-    t.datetime "created_at",                     :null => false
-    t.datetime "updated_at",                     :null => false
+    t.text     "input",      limit: 16777215
+    t.text     "solution",   limit: 16777215
+    t.datetime "created_at",                  null: false
+    t.datetime "updated_at",                  null: false
   end
 
-  create_table "test_requests", :force => true do |t|
+  create_table "test_requests", force: :cascade do |t|
     t.integer  "user_id"
     t.integer  "problem_id"
     t.integer  "submission_id"
@@ -222,59 +222,59 @@
     t.string   "output_file_name"
     t.string   "running_stat"
     t.integer  "status"
-    t.datetime "updated_at",       :null => false
+    t.datetime "updated_at",       null: false
     t.datetime "submitted_at"
     t.datetime "compiled_at"
     t.text     "compiler_message"
     t.datetime "graded_at"
     t.string   "grader_comment"
-    t.datetime "created_at",       :null => false
+    t.datetime "created_at",       null: false
     t.float    "running_time"
     t.string   "exit_status"
     t.integer  "memory_usage"
   end
 
-  add_index "test_requests", ["user_id", "problem_id"], :name => "index_test_requests_on_user_id_and_problem_id"
+  add_index "test_requests", ["user_id", "problem_id"], name: "index_test_requests_on_user_id_and_problem_id"
 
-  create_table "testcases", :force => true do |t|
+  create_table "testcases", force: :cascade do |t|
     t.integer  "problem_id"
     t.integer  "num"
     t.integer  "group"
     t.integer  "score"
     t.text     "input"
     t.text     "sol"
-    t.datetime "created_at", :null => false
-    t.datetime "updated_at", :null => false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
   end
 
-  add_index "testcases", ["problem_id"], :name => "index_testcases_on_problem_id"
+  add_index "testcases", ["problem_id"], name: "index_testcases_on_problem_id"
 
-  create_table "user_contest_stats", :force => true do |t|
+  create_table "user_contest_stats", force: :cascade do |t|
     t.integer  "user_id"
     t.datetime "started_at"
-    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.boolean  "forced_logout"
   end
 
-  create_table "users", :force => true do |t|
-    t.string   "login",           :limit => 50
+  create_table "users", force: :cascade do |t|
+    t.string   "login",           limit: 50
     t.string   "full_name"
     t.string   "hashed_password"
-    t.string   "salt",            :limit => 5
+    t.string   "salt",            limit: 5
     t.string   "alias"
     t.string   "email"
     t.integer  "site_id"
     t.integer  "country_id"
-    t.boolean  "activated",                     :default => false
+    t.boolean  "activated",                  default: false
     t.datetime "created_at"
     t.datetime "updated_at"
-    t.boolean  "enabled",                       :default => true
+    t.boolean  "enabled",                    default: true
     t.string   "remark"
     t.string   "last_ip"
     t.string   "section"
   end
 
-  add_index "users", ["login"], :name => "index_users_on_login", :unique => true
+  add_index "users", ["login"], name: "index_users_on_login", unique: true
 
 end