Extract mismatch validator to separate class

#569

app/models/contact/ident.rb

@@ -12,7 +12,7 @@ class Contact::Ident
 
   validates :type, presence: true, inclusion: { in: proc { types } }
   validates :country_code, presence: true, iso31661_alpha2: true
-  validate :mismatched
+  validates_with MismatchValidator
 
   def self.epp_code_map
     {
@@ -35,14 +35,6 @@ class Contact::Ident
     %w[org priv birthday]
   end
 
-  Mismatch = Struct.new(:type, :country)
-
-  def self.mismatches
-    [
-      Mismatch.new('birthday', Country.new('EE'))
-    ]
-  end
-
   def marked_for_destruction?
     false
   end
@@ -66,10 +58,7 @@ class Contact::Ident
   private
 
   # https://github.com/rails/rails/issues/1513
-  def validation_context=(_value); end
-
-  def mismatched
-    mismatched = self.class.mismatches.include?(Mismatch.new(type, country))
-    errors.add(:base, :mismatch, type: type, country: country) if mismatched
+  def validation_context=(_value)
+    ;
   end
 end

app/validators/contact/ident/mismatch_validator.rb

@@ -0,0 +1,20 @@
+class Contact::Ident::MismatchValidator < ActiveModel::Validator
+  Mismatch = Struct.new(:type, :country)
+
+  def self.mismatches
+    [
+      Mismatch.new('birthday', Country.new('EE')),
+    ]
+  end
+
+  def validate(record)
+    record.errors.add(:base, :mismatch, type: record.type, country: record.country) if mismatched?(record)
+  end
+
+  private
+
+  def mismatched?(record)
+    mismatch = Mismatch.new(record.type, record.country)
+    self.class.mismatches.include?(mismatch)
+  end
+end

spec/models/contact/ident_spec.rb

@@ -129,8 +129,8 @@ RSpec.describe Contact::Ident, db: false do
     let(:ident) { described_class.new(type: 'test', country_code: 'DE') }
 
     before do
-      mismatches = [Contact::Ident::Mismatch.new('test', Country.new('DE'))]
-      allow(described_class).to receive(:mismatches).and_return(mismatches)
+      mismatches = [Contact::Ident::MismatchValidator::Mismatch.new('test', Country.new('DE'))]
+      allow(Contact::Ident::MismatchValidator).to receive(:mismatches).and_return(mismatches)
     end
 
     it 'rejects mismatched' do
@@ -161,16 +161,6 @@ RSpec.describe Contact::Ident, db: false do
     end
   end
 
-  describe '::mismatches' do
-    it 'returns mismatches' do
-      mismatches = [
-        Contact::Ident::Mismatch.new('birthday', Country.new('EE'))
-      ]
-
-      expect(described_class.mismatches).to eq(mismatches)
-    end
-  end
-
   describe '#birthday?' do
     context 'when type is birthday' do
       subject(:ident) { described_class.new(type: 'birthday') }

spec/requests/epp/contact/create/ident_spec.rb

@@ -271,9 +271,9 @@ RSpec.describe 'EPP contact:create' do
 
     before do
       mismatches = [
-        Contact::Ident::Mismatch.new('priv', Country.new('DE'))
+        Contact::Ident::MismatchValidator::Mismatch.new('priv', Country.new('DE'))
       ]
-      allow(Contact::Ident).to receive(:mismatches).and_return(mismatches)
+      allow(Contact::Ident::MismatchValidator).to receive(:mismatches).and_return(mismatches)
     end
 
     it 'does not create a contact' do

spec/validators/contact/ident/mismatch_validator_spec.rb

@@ -0,0 +1,13 @@
+require 'rails_helper'
+
+RSpec.describe Contact::Ident::MismatchValidator do
+  describe '::mismatches' do
+    it 'returns mismatches' do
+      mismatches = [
+        Contact::Ident::MismatchValidator::Mismatch.new('birthday', Country.new('EE'))
+      ]
+
+      expect(described_class.mismatches).to eq(mismatches)
+    end
+  end
+end