#306

backend/app/models/material.rb

@@ -9,6 +9,10 @@ class Material < ApplicationRecord
   belongs_to :tag, optional: true
   belongs_to :created_by_user, class_name: 'User', optional: true
   belongs_to :updated_by_user, class_name: 'User', optional: true
+  belongs_to :file_suppressed_by_user, class_name: 'User', optional: true
+
+  has_many :material_versions, dependent: :destroy
+  has_many :material_export_items, dependent: :destroy
 
   has_one_attached :file, dependent: :purge
 
@@ -18,11 +22,18 @@ class Material < ApplicationRecord
   validate :tag_must_be_material_category
 
   def content_type
+    return nil if file_suppressed?
     return nil unless file&.attached?
 
     file.blob.content_type
   end
 
+  def file_suppressed? = file_suppressed_at.present?
+
+  def snapshot_export_paths
+    material_export_items.order(:profile).pluck(:profile, :export_path).to_h
+  end
+
   private
 
   def file_must_be_attached