MONGOID-5825 Do not update timestamp on destroyed (#5939)

lib/mongoid/timestamps/created.rb

@@ -23,13 +23,20 @@ module Created
       # @example Set the created at time.
       #   person.set_created_at
       def set_created_at
-        if !timeless? && !created_at
+        if able_to_set_created_at?
           now = Time.current
           self.updated_at = now if is_a?(Updated) && !updated_at_changed?
           self.created_at = now
         end
         clear_timeless_option
       end
+
+      # Is the created timestamp able to be set?
+      #
+      # @return [ true, false ] If the timestamp can be set.
+      def able_to_set_created_at?
+        !frozen? && !timeless? && !created_at
+      end
     end
   end
 end

spec/mongoid/timestamps/created_spec.rb

@@ -44,4 +44,27 @@
       expect(quiz.created_at).to be_within(10).of(Time.now.utc)
     end
   end
+
+  context "when the document is destroyed" do
+    let(:book) do
+      Book.create!
+    end
+
+    before do
+      Cover.before_save do
+        destroy if title == "delete me"
+      end
+    end
+
+    after do
+      Cover.reset_callbacks(:save)
+    end
+
+    it "does not set the created_at timestamp" do
+      book.covers << Cover.new(title: "delete me")
+      expect {
+        book.save
+      }.not_to raise_error
+    end
+  end
 end