Derive from application_record

app/models/accountify/contact.rb

@@ -1,5 +1,5 @@
 module Accountify
-  class Contact < ActiveRecord::Base
+  class Contact < ApplicationRecord
     self.table_name = 'accountify_contacts'
 
     validates :organisation_id, presence: true

app/models/accountify/invoice.rb

@@ -1,5 +1,5 @@
 module Accountify
-  class Invoice < ActiveRecord::Base
+  class Invoice < ApplicationRecord
     self.table_name = 'accountify_invoices'
 
     module Status

app/models/accountify/invoice_line_item.rb

@@ -1,5 +1,5 @@
 module Accountify
-  class InvoiceLineItem < ActiveRecord::Base
+  class InvoiceLineItem < ApplicationRecord
     self.table_name = 'accountify_invoice_line_items'
   end
 end

app/models/accountify/invoice_status_summary.rb

@@ -1,5 +1,5 @@
 module Accountify
-  class InvoiceStatusSummary < ActiveRecord::Base
+  class InvoiceStatusSummary < ApplicationRecord
     self.table_name = 'accountify_invoice_status_summaries'
 
     validates :organisation_id, presence: true

app/models/accountify/organisation.rb

@@ -1,5 +1,5 @@
 module Accountify
-  class Organisation < ActiveRecord::Base
+  class Organisation < ApplicationRecord
     self.table_name = 'accountify_organisations'
 
     has_many :events, -> { order(created_at: :asc) }, as: :eventable

app/models/application_record.rb

@@ -0,0 +1,3 @@
+class ApplicationRecord < ActiveRecord::Base
+  self.abstract_class = true
+end

app/models/event.rb

@@ -1,4 +1,4 @@
-class Event < ActiveRecord::Base
+class Event < ApplicationRecord
   self.table_name = 'events'
 
   # associations