Update VAT

#623

app/models/invoice.rb

@@ -29,6 +29,7 @@ class Invoice < ActiveRecord::Base
 
   validates :invoice_type, :due_date, :currency, :seller_name,
             :seller_iban, :buyer_name, :invoice_items, :vat_rate, presence: true
+  validates :vat_rate, numericality: { greater_than_or_equal_to: 0, less_than_or_equal_to: 99 }, allow_nil: true
 
   before_create :set_invoice_number, :check_vat
 
@@ -106,12 +107,12 @@ class Invoice < ActiveRecord::Base
   def buyer_country
     Country.new(buyer_country_code)
   end
-  
+
 # order is used for directo/banklink description
   def order
     "Order nr. #{number}"
   end
-  
+
   def pdf(html)
     kit = PDFKit.new(html)
     kit.to_pdf

app/models/registrar.rb

@@ -1,3 +1,21 @@
+class VATRateType < ActiveRecord::Type::Value
+  def type_cast_from_user(value)
+    if value.blank?
+      nil
+    else
+      super
+    end
+  end
+
+  def type_cast_from_database(value)
+    BigDecimal.new(value) * 100 if value
+  end
+
+  def type_cast_for_database(value)
+    BigDecimal.new(value) / 100 if value
+  end
+end
+
 class Registrar < ActiveRecord::Base
   include Versions # version/registrar_version.rb
 
@@ -23,16 +41,9 @@ class Registrar < ActiveRecord::Base
   validates :vat_rate, numericality: { greater_than_or_equal_to: 0, less_than_or_equal_to: 99 }, allow_nil: true
   validate :forbidden_codes
 
+  attribute :vat_rate, VATRateType.new
   after_initialize :set_defaults
 
-  before_save do
-    self.vat_rate = vat_rate / 100.0 if vat_rate
-  end
-
-  after_find do |registrar|
-    registrar.vat_rate = registrar.vat_rate * 100 if registrar.vat_rate
-  end
-
   def forbidden_codes
     return true unless ['CID'].include? code
     errors.add(:code, I18n.t(:forbidden_code))
@@ -87,6 +98,16 @@ class Registrar < ActiveRecord::Base
   # rubocop:disable Metrics/MethodLength
   # rubocop:disable Metrics/AbcSize
   def issue_prepayment_invoice(amount, description = nil)
+    vat_rate = if local_vat_payer?
+                 Setting.registry_vat_prc
+               else
+                 if vat_no.blank?
+                   self.vat_rate
+                 else
+                   nil
+                 end
+               end
+
     invoices.create(
       invoice_type: 'DEB',
       due_date: (Time.zone.now.to_date + Setting.days_to_keep_invoices_active.days).end_of_day,
@@ -94,6 +115,7 @@ class Registrar < ActiveRecord::Base
       description: description,
       currency: 'EUR',
       vat_rate: Setting.registry_vat_prc,
+      vat_rate: vat_rate,
       seller_name: Setting.registry_juridical_name,
       seller_reg_no: Setting.registry_reg_no,
       seller_iban: Setting.registry_iban,

test/fixtures/invoices.yml

@@ -30,3 +30,11 @@ outstanding:
 overdue:
   <<: *DEFAULTS
   due_date: <%= Date.parse '2010-07-03' %>
+
+with_vat:
+  <<: *DEFAULTS
+  vat_rate: 0.2
+
+without_vat:
+  <<: *DEFAULTS
+  vat_rate: null

test/integration/admin/invoices/invoice_details_test.rb

@@ -0,0 +1,19 @@
+require 'test_helper'
+
+class InvoiceDetailsTest < ActionDispatch::IntegrationTest
+  def setup
+    login_as users(:admin)
+  end
+
+  def test_with_vat
+    invoice = invoices(:with_vat)
+    visit admin_invoice_path(invoice)
+    assert_selector '.total', text: 'VAT'
+  end
+
+  def test_without_vat
+    invoice = invoices(:without_vat)
+    visit admin_invoice_path(invoice)
+    assert_no_selector '.total', text: 'VAT'
+  end
+end

test/integration/admin/registrars/show_registrar_test.rb

@@ -17,7 +17,7 @@ class ShowRegistrarTest < ActionDispatch::IntegrationTest
     assert_text 'Language English'
   end
 
-  def test_vat_number
+  def test_vat_no
     assert_text 'US12345'
   end
 

test/integration/registrar/invoices/invoice_details_test.rb

@@ -0,0 +1,19 @@
+require 'test_helper'
+
+class InvoiceDetailsTest < ActionDispatch::IntegrationTest
+  def setup
+    login_as users(:api)
+  end
+
+  def test_with_vat
+    invoice = invoices(:with_vat)
+    visit registrar_invoice_path(invoice)
+    assert_selector '.total', text: 'VAT'
+  end
+
+  def test_without_vat
+    invoice = invoices(:without_vat)
+    visit registrar_invoice_path(invoice)
+    assert_no_selector '.total', text: 'VAT'
+  end
+end

test/models/invoice_test.rb

@@ -1,9 +1,34 @@
 require 'test_helper'
 
 class InvoiceTest < ActiveSupport::TestCase
+  def setup
+    @invoice = invoices(:valid)
+  end
+
+  def test_valid
+    assert @invoice.valid?
+  end
+
   def test_invalid_without_vat_rate
-    invoice = Invoice.new(vat_rate: nil)
+    @invoice.vat_rate = nil
-    invoice.validate
+    assert @invoice.invalid?
-    assert invoice.errors.added?(:vat_rate, :blank)
+  end
+
+  def test_allows_absent_vat_rate
+    @invoice.vat_rate = nil
+    @invoice.validate
+    assert @invoice.valid?
+  end
+
+  def test_rejects_negative_vat_rate
+    @invoice.vat_rate = -1
+    @invoice.validate
+    assert @invoice.invalid?
+  end
+
+  def test_rejects_vat_rate_greater_than_max
+    @invoice.vat_rate = 100
+    @invoice.validate
+    assert @invoice.invalid?
   end
 end

test/models/registrar_test.rb

@@ -39,7 +39,7 @@ class RegistrarTest < ActiveSupport::TestCase
     assert_equal 'de', registrar.language
   end
 
-  def test_rejects_vat_number_when_local_vat_payer
+  def test_rejects_vat_no_when_local_vat_payer
     Registry.instance.stub(:legal_address_country, Country.new('US')) do
       @registrar.vat_no = 'US1'
       @registrar.validate
@@ -67,11 +67,6 @@ class RegistrarTest < ActiveSupport::TestCase
     assert @registrar.invalid?
   end
 
-  def test_converts_integer_vat_rate_to_fractional
-    @registrar = registrars(:foreign_vat_payer_with_rate)
-    assert_equal 20, @registrar.vat_rate
-  end
-
   def test_requires_vat_rate_when_foreign_vat_payer_without_number
     Registry.instance.stub(:legal_address_country, Country.new('GB')) do
       @registrar.vat_no = nil
@@ -88,4 +83,21 @@ class RegistrarTest < ActiveSupport::TestCase
       assert @registrar.invalid?
     end
   end
+
+  def test_serializes_and_deserializes_vat_rate
+    valid_attributes = registrars(:valid).attributes.except('id').merge({ name: 'uniq1',
+                                                                          reg_no: 'uniq1',
+                                                                          code: 'uniq1',
+                                                                          country_code: 'GB' })
+    registrar = Registrar.new(valid_attributes)
+    registrar.vat_rate = 55
+    registrar.save!
+    registrar.reload
+    assert_equal 55, registrar.vat_rate
+  end
+
+  def test_treats_empty_vat_rate_as_absent
+    @registrar.vat_rate = ''
+    assert_nil @registrar.vat_rate
+  end
 end