Dynamic validations example

app/models/domain.rb

@@ -127,8 +127,10 @@ class Domain < ActiveRecord::Base
   ### VALIDATIONS ###
 
   def validate_nameservers_count
-    unless nameservers.length.between?(1, 13)
+    sg = SettingGroup.find_by(code: SettingGroup::DOMAIN_VALIDATION_CODE)
-      errors.add(:nameservers, :out_of_range, {min: 1, max: 13})
+    min, max = sg.get(:ns_min_count).to_i, sg.get(:ns_max_count).to_i
+    unless nameservers.length.between?(min, max)
+      errors.add(:nameservers, :out_of_range, {min: min, max: max})
     end
   end
 

app/models/setting_group.rb

@@ -2,4 +2,11 @@ class SettingGroup < ActiveRecord::Base
   has_many :settings
 
   accepts_nested_attributes_for :settings
+
+  DOMAIN_VALIDATION_CODE = 'domain_validation'
+
+  def get(key)
+    s = settings.find_by(code: key.to_s)
+    s.try(:value)
+  end
 end

spec/epp/domain_spec.rb

@@ -4,7 +4,10 @@ describe 'EPP Domain', epp: true do
   let(:server) { server = Epp::Server.new({server: 'localhost', tag: 'gitlab', password: 'ghyt9e4fu', port: 701}) }
 
   context 'with valid user' do
-    before(:each) { Fabricate(:epp_user) }
+    before(:each) do
+      Fabricate(:epp_user)
+      Fabricate(:domain_validation_setting_group)
+    end
 
     it 'returns error if contact does not exists' do
       Fabricate(:contact, code: 'jd1234')

spec/fabricators/setting_group_fabricator.rb

@@ -5,3 +5,11 @@ Fabricator(:setting_group) do
     Fabricate(:setting, code: 'ns_max_count', value: 13)
   ]}
 end
+
+Fabricator(:domain_validation_setting_group, from: :setting_group) do
+  code 'domain_validation'
+  settings { [
+    Fabricate(:setting, code: 'ns_min_count', value: 1),
+    Fabricate(:setting, code: 'ns_max_count', value: 13)
+  ]}
+end

spec/features/setting_management_spec.rb

@@ -1,7 +1,7 @@
 require 'rails_helper'
 
 feature 'Setting management' do
-  background { Fabricate(:setting_group) }
+  background { Fabricate(:domain_validation_setting_group) }
 
   scenario 'User changes a setting', js: true do
     visit root_path

spec/models/contact_spec.rb

@@ -51,7 +51,11 @@ describe Contact, '#get_relation' do
 end
 
 describe Contact, '#has_relation' do
-  before(:each) { Fabricate(:domain) }
+  before(:each) do
+    Fabricate(:domain_validation_setting_group)
+    Fabricate(:domain)
+  end
+
   it 'should return false if no relation' do
     expect(Contact.last.has_relation(:chewbacca)).to eq false
   end

spec/models/domain_spec.rb

@@ -7,6 +7,9 @@ describe Domain do
   it { should have_many(:tech_contacts) }
   it { should have_many(:admin_contacts) }
 
+  context 'with sufficient settings' do
+    before(:each) { Fabricate(:domain_validation_setting_group) }
+
     it 'validates domain name' do
       d = Fabricate(:domain)
       expect(d.name).to_not be_nil
@@ -57,5 +60,5 @@ describe Domain do
       expect(Fabricate.build(:domain, period: 4).valid?).to be false
       expect(Fabricate.build(:domain, period: 3).valid?).to be true
     end
-
+  end
 end