elements

app/models/communication/block/template/base.rb

 class Communication::Block::Template::Base
-  class_attribute :components_descriptions, :layouts
+  class_attribute :components_descriptions,
+                  :layouts,
+                  :element_class
 
   attr_reader :block
 
@@ -29,6 +31,10 @@ class Communication::Block::Template::Base
     self.layouts = list
   end
 
+  def self.has_elements(element_class)
+    self.element_class = element_class
+  end
+
   def self.has_component(property, kind)
     self.components_descriptions ||= []
     self.components_descriptions << { name: property, type: kind }
@@ -92,7 +98,8 @@ class Communication::Block::Template::Base
   end
 
   def default_element
-    nil
+    return if self.class.element_class.nil?
+    self.class.element_class.new block
   end
 
   def elements

app/models/communication/block/template/gallery.rb

 class Communication::Block::Template::Gallery < Communication::Block::Template::Base
 
   has_layouts [:grid, :carousel]
-
-  def default_element
-    Communication::Block::Template::Gallery::Image.new block
-  end
+  has_elements Communication::Block::Template::Gallery::Image
 
   def build_git_dependencies
     add_dependency active_storage_blobs

app/models/communication/block/template/page.rb

@@ -20,10 +20,6 @@ class Communication::Block::Template::Page < Communication::Block::Template::Bas
     @main_page ||= page(data['page_id'])
   end
 
-  def layout
-    data['layout'] || 'grid'
-  end
-
   def show_main_description
     data['show_main_description'] || false
   end