Convert EmailHelper to CanonicalEmail model concern

app/helpers/email_helper.rb

@@ -1,18 +0,0 @@
-# frozen_string_literal: true
-
-module EmailHelper
-  def self.included(base)
-    base.extend(self)
-  end
-
-  def email_to_canonical_email(str)
-    username, domain = str.downcase.split('@', 2)
-    username, = username.delete('.').split('+', 2)
-
-    "#{username}@#{domain}"
-  end
-
-  def email_to_canonical_email_hash(str)
-    Digest::SHA2.new(256).hexdigest(email_to_canonical_email(str))
-  end
-end

app/models/canonical_email_block.rb

@@ -12,7 +12,7 @@
 #
 
 class CanonicalEmailBlock < ApplicationRecord
-  include EmailHelper
+  include CanonicalEmail
   include Paginable
 
   belongs_to :reference_account, class_name: 'Account', optional: true
@@ -26,7 +26,7 @@ class CanonicalEmailBlock < ApplicationRecord
   end
 
   def email=(email)
-    self.canonical_email_hash = email_to_canonical_email_hash(email)
+    self.canonical_email_hash = self.class.email_to_canonical_email_hash(email)
   end
 
   def self.block?(email)

app/models/concerns/canonical_email.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+module CanonicalEmail
+  extend ActiveSupport::Concern
+
+  class_methods do
+    def email_to_canonical_email(str)
+      username, domain = str.downcase.split('@', 2)
+      username, = username.delete('.').split('+', 2)
+
+      "#{username}@#{domain}"
+    end
+
+    def email_to_canonical_email_hash(str)
+      Digest::SHA2
+        .new(256)
+        .hexdigest(
+          email_to_canonical_email(str)
+        )
+    end
+  end
+end