diff --git a/.rubocop.yml b/.rubocop.yml
index 8b36803..559bd75 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -41,7 +41,6 @@ Style/StringLiterals:
 Metrics/AbcSize:
   Exclude:
     - db/migrate/**/*
-    - app/services/crypt_serializer.rb
 
 Metrics/LineLength:
   Max: 110
@@ -54,3 +53,6 @@ Metrics/LineLength:
 Metrics/MethodLength:
   Exclude:
     - db/migrate/*
+
+Rails:
+  Enabled: true
diff --git a/.ruby_version b/.ruby_version
new file mode 100644
index 0000000..2bf1c1c
--- /dev/null
+++ b/.ruby_version
@@ -0,0 +1 @@
+2.3.1
diff --git a/Guardfile b/Guardfile
index e97c0a7..5113fbf 100644
--- a/Guardfile
+++ b/Guardfile
@@ -32,5 +32,6 @@ end
 guard :rubocop do
   watch(/.+\.rb$/)
   watch(/Rakefile/)
+  watch(/.rubocop.yml/)
   watch(%r{(?:.+/)?\.rubocop\.yml$}) { |m| File.dirname(m[0]) }
 end
diff --git a/app/services/crypt_serializer.rb b/app/services/crypt_serializer.rb
index ef391c6..9f2b656 100644
--- a/app/services/crypt_serializer.rb
+++ b/app/services/crypt_serializer.rb
@@ -26,18 +26,28 @@ class CryptSerializer
       raise "Attribute was supposed to be a `String`, but was instead a `#{value.class}`"
     end
 
-    cipher.encrypt
-    parts = [cipher.random_key, cipher.random_iv, cipher.update(value) + cipher.final]
-    Base64.urlsafe_encode64 Marshal.dump(parts)
+    build_cipher value
   end
 
   def decrypt(value)
     return value if value.nil?
 
     parts = Marshal.load Base64.urlsafe_decode64(value)
-    cipher.decrypt
-    cipher.key = parts[0]
-    cipher.iv = parts[1]
-    cipher.update(parts[2]) + cipher.final
+    decode_cipher parts
   end
+
+  private
+
+    def build_cipher value
+      cipher.encrypt
+      parts = [cipher.random_key, cipher.random_iv, cipher.update(value) + cipher.final]
+      Base64.urlsafe_encode64 Marshal.dump(parts)
+    end
+
+    def decode_cipher parts
+      cipher.decrypt
+      cipher.key = parts[0]
+      cipher.iv = parts[1]
+      cipher.update(parts[2]) + cipher.final
+    end
 end
diff --git a/config/database.yml b/config/database.yml
index 73b808d..23bb41d 100644
--- a/config/database.yml
+++ b/config/database.yml
@@ -16,7 +16,7 @@ default: &default
   host: <%= ENV['mysql_host'] %>
   username: <%= ENV['mysql_usr'] %>
   password: <%= ENV['mysql_pwd'] %>
-  socket: /var/run/mysqld/mysqld.sock
+  # socket: /var/run/mysqld/mysqld.sock
 
 development:
   <<: *default