Validate iban

app/controllers/admin/registrars_controller.rb

@@ -3,6 +3,7 @@ module Admin
     load_and_authorize_resource
     before_action :set_registrar, only: [:show, :edit, :update, :destroy]
     helper_method :registry_vat_rate
+    helper_method :iban_max_length
 
     def index
       @q = Registrar.joins(:accounts).ordered.search(params[:q])
@@ -80,5 +81,9 @@ module Admin
     def registry_vat_rate
       Registry.current.vat_rate
     end
+
+    def iban_max_length
+      Iban.max_length
+    end
   end
 end

app/models/iban.rb

@@ -0,0 +1,5 @@
+class Iban
+  def self.max_length
+    34
+  end
+end

app/views/admin/registrars/form/_billing.html.erb

@@ -73,7 +73,7 @@
                         <%= f.label :iban %>
                     </div>
                     <div class="col-md-7">
-                        <%= f.text_field :iban, class: 'form-control' %>
+                        <%= f.text_field :iban, maxlength: iban_max_length, class: 'form-control' %>
                     </div>
                 </div>
             </div>

test/models/iban_test.rb

@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class IbanTest < ActiveSupport::TestCase
+  def test_returns_max_length
+    assert_equal 34, Iban.max_length
+  end
+end