adds validation for postal codes in Madrid

app/models/verification/residence.rb

@@ -14,6 +14,7 @@ class Verification::Residence
 
   validate :allowed_age
   validate :document_number_uniqueness
+  validate :postal_code_in_madrid
   validate :residence_in_madrid
 
   def initialize(attrs={})
@@ -30,10 +31,19 @@ class Verification::Residence
                 residence_verified_at: Time.now)
   end
 
+  def allowed_age
+    return if errors[:date_of_birth].any?
+    errors.add(:date_of_birth, I18n.t('verification.residence.new.error_not_allowed_age')) unless self.date_of_birth <= 16.years.ago
+  end
+
   def document_number_uniqueness
     errors.add(:document_number, I18n.t('errors.messages.taken')) if User.where(document_number: document_number).any?
   end
 
+  def postal_code_in_madrid
+    errors.add(:postal_code, I18n.t('verification.residence.new.error_not_allowed_postal_code')) unless valid_postal_code?
+  end
+
   def residence_in_madrid
     return if errors.any?
     self.date_of_birth = date_to_string(date_of_birth)
@@ -48,11 +58,6 @@ class Verification::Residence
     self.date_of_birth = string_to_date(date_of_birth)
   end
 
-  def allowed_age
-    return if errors[:date_of_birth].any?
-    errors.add(:date_of_birth, I18n.t('verification.residence.new.error_not_allowed_age')) unless self.date_of_birth <= 16.years.ago
-  end
-
   def store_failed_attempt
     FailedCensusCall.create({
       user: user,