add trashable concern on user

app/models/concerns/trashable.rb

@@ -0,0 +1,21 @@
+module Trashable
+  extend ActiveSupport::Concern
+
+  included do
+    default_scope { where(deleted_at: nil) }
+  end
+
+  module ClassMethods
+    def trashed
+      self.unscoped.where(self.arel_table[:deleted_at].not_eq(nil))
+    end
+  end
+
+  def destroy
+    update_column :deleted_at, Time.now
+  end
+
+  def recover
+    update_attribute :deleted_at, nil
+  end
+end