Upgrade to Rails 6.0 and apply new framework defaults

db/migrate/20210510174452_add_foreign_key_constraint_to_active_storage_attachments_for_blob_id.active_storage.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+# This migration comes from active_storage (originally 20180723000244)
+class AddForeignKeyConstraintToActiveStorageAttachmentsForBlobId < ActiveRecord::Migration[6.0]
+  def up
+    return if foreign_key_exists?(:active_storage_attachments, column: :blob_id)
+
+    if table_exists?(:active_storage_blobs)
+      add_foreign_key :active_storage_attachments, :active_storage_blobs, column: :blob_id
+    end
+  end
+end