feat: move resolved contacts to a scope

app/models/contact.rb

@@ -68,6 +68,8 @@ class Contact < ApplicationRecord
 
   enum contact_type: { visitor: 0, lead: 1, customer: 2 }
 
+  scope :resolved_contacts, -> { where("contacts.email <> '' OR contacts.phone_number <> '' OR contacts.identifier <> ''") }
+
   scope :order_on_last_activity_at, lambda { |direction|
     order(
       Arel::Nodes::SqlLiteral.new(
@@ -164,10 +166,6 @@ class Contact < ApplicationRecord
     }
   end
 
-  def self.resolved_contacts
-    where("contacts.email <> '' OR contacts.phone_number <> '' OR contacts.identifier <> ''")
-  end
-
   def discard_invalid_attrs
     phone_number_format
     email_format