diff --git a/app/decorators/practice_decorator.rb b/app/decorators/practice_decorator.rb
deleted file mode 100644
index 2e42f9b3746..00000000000
--- a/app/decorators/practice_decorator.rb
+++ /dev/null
@@ -1,17 +0,0 @@
-# frozen_string_literal: true
-
-module PracticeDecorator
-  OGP_IMAGE_SIZE = [1200, 630].freeze
-
-  def ogp_image_url
-    default_image_path = '/ogp/ogp.png'
-
-    if ogp_image.attached?
-      ogp_image.variant(resize_to_fill: OGP_IMAGE_SIZE, autorot: true, saver: { strip: true, quality: 60 }).processed.url
-    else
-      image_url default_image_path
-    end
-  rescue ActiveStorage::FileNotFoundError, ActiveStorage::InvariableError, Vips::Error
-    image_url default_image_path
-  end
-end
diff --git a/app/models/practice.rb b/app/models/practice.rb
index 3103daa6be0..348288039cc 100644
--- a/app/models/practice.rb
+++ b/app/models/practice.rb
@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class Practice < ApplicationRecord
+  OGP_IMAGE_SIZE = [1200, 630].freeze
+
   include Watchable
   include Searchable
 
@@ -168,6 +170,18 @@ def include_must_read_books?
     practices_books.any?(&:must_read)
   end
 
+  def ogp_image_url
+    default_image_path = '/ogp/ogp.png'
+
+    if ogp_image.attached?
+      ogp_image.variant(resize_to_fill: OGP_IMAGE_SIZE, autorot: true, saver: { strip: true, quality: 60 }).processed.url
+    else
+      image_url default_image_path
+    end
+  rescue ActiveStorage::FileNotFoundError, ActiveStorage::InvariableError, Vips::Error
+    image_url default_image_path
+  end
+
   private
 
   def total_learning_minute(report)