dry

app/models/application_record.rb

 class ApplicationRecord < ActiveRecord::Base
   self.abstract_class = true
+
+  def self.models_with_concern(concern)
+    descendants.select { |model|
+      model.included_modules.include?(concern)
+    }
+  end
+
+  def self.model_names_with_concern(concern)
+    models_with_concern(concern).map(&:name)
+  end
 end

app/models/communication/block.rb

@@ -103,7 +103,7 @@ class Communication::Block < ApplicationRecord
   before_validation :set_university_and_website_from_about, on: :create
 
   def self.permitted_about_types
-    ApplicationRecord.descendants.select { |model| model.included_modules.include?(WithBlocks) }.map(&:name)
+    ApplicationRecord.model_names_with_concern(WithBlocks)
   end
 
   # When we set data from json, we pass it to the template.

app/models/communication/block/heading.rb

@@ -52,7 +52,7 @@ class Communication::Block::Heading < ApplicationRecord
   before_validation :compute_level
 
   def self.permitted_about_types
-    ApplicationRecord.descendants.select { |model| model.included_modules.include?(WithBlocks) }.map(&:name)
+    ApplicationRecord.model_names_with_concern(WithBlocks)
   end
 
   def references

app/models/communication/website/permalink.rb

@@ -105,7 +105,7 @@ class Communication::Website::Permalink < ApplicationRecord
   end
 
   def self.permitted_about_types
-    ApplicationRecord.descendants.select { |model| model.included_modules.include?(WithPermalink) }.map(&:name)
+    ApplicationRecord.model_names_with_concern(WithPermalink)
   end
 
   def pattern

app/models/user/favorite.rb

@@ -23,6 +23,6 @@ class User::Favorite < ApplicationRecord
   belongs_to :about, polymorphic: true
 
   def self.permitted_about_types
-    ApplicationRecord.descendants.select { |model| model.included_modules.include?(Favoritable) }.map(&:name)
+    ApplicationRecord.model_names_with_concern(Favoritable)
   end
 end