#306

backend/app/models/material.rb

@@ -15,6 +15,7 @@ class Material < ApplicationRecord
   has_many :material_export_items, dependent: :destroy
 
   has_one_attached :file, dependent: :purge
+  has_one_attached :thumbnail, dependent: :purge
 
   validates :tag_id, presence: true, uniqueness: true
 
@@ -28,6 +29,18 @@ class Material < ApplicationRecord
     file.blob.content_type
   end
 
+  def file_byte_size
+    return nil unless file&.attached?
+
+    file.blob.byte_size
+  end
+
+  def file_filename
+    return nil unless file&.attached?
+
+    file.blob.filename.to_s
+  end
+
   def file_suppressed? = file_suppressed_at.present?
 
   def snapshot_export_paths