Change invoices.issue_date database column to NOT NULL

app/models/invoice.rb

@@ -26,7 +26,6 @@ class Invoice < ActiveRecord::Base
 
   scope :overdue, -> { unpaid.non_cancelled.where('due_date < ?', Time.zone.today) }
 
-  validates :issue_date, presence: true
   validates :due_date, :currency, :seller_name,
             :seller_iban, :buyer_name, :items, presence: true
   validates :vat_rate, numericality: { greater_than_or_equal_to: 0, less_than: 100 },

db/migrate/20190315172802_change_invoices_issue_date_to_not_null.rb

@@ -0,0 +1,5 @@
+class ChangeInvoicesIssueDateToNotNull < ActiveRecord::Migration
+  def change
+    change_column_null :invoices, :issue_date, false
+  end
+end

db/structure.sql

@@ -1082,7 +1082,7 @@ CREATE TABLE public.invoices (
     total numeric(10,2) NOT NULL,
     in_directo boolean DEFAULT false,
     buyer_vat_no character varying,
-    issue_date date
+    issue_date date NOT NULL
 );
 
 
@@ -4934,6 +4934,8 @@ INSERT INTO schema_migrations (version) VALUES ('20190311111718');
 
 INSERT INTO schema_migrations (version) VALUES ('20190312211614');
 
+INSERT INTO schema_migrations (version) VALUES ('20190315172802');
+
 INSERT INTO schema_migrations (version) VALUES ('20190319133036');
 
 INSERT INTO schema_migrations (version) VALUES ('20190322152123');

test/models/invoice_test.rb

@@ -33,11 +33,6 @@ def test_overdue_scope_does_not_return_invoices_with_due_due_of_today_or_in_the_
     assert_not Invoice.overdue.include?(@invoice), 'Should not return non-overdue invoice'
   end
 
-  def test_invalid_without_issue_date
-    @invoice.issue_date = nil
-    assert @invoice.invalid?
-  end
-
   def test_optional_vat_rate
     @invoice.vat_rate = nil
     assert @invoice.valid?