From 77e2a09de24eda9c2c7f27d3ffad3449d21cc84f Mon Sep 17 00:00:00 2001
From: DarshanaVenkatesh <70602567+DarshanaVenkatesh@users.noreply.github.com>
Date: Fri, 13 Dec 2024 09:56:35 -0800
Subject: [PATCH] MONGOID-5737 Fix issue where <=> errors if there's a
 non-document (backport for 8.1)

---
 lib/mongoid/equality.rb       | 1 +
 spec/mongoid/equality_spec.rb | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/lib/mongoid/equality.rb b/lib/mongoid/equality.rb
index daeabf0166..ddd65161bd 100644
--- a/lib/mongoid/equality.rb
+++ b/lib/mongoid/equality.rb
@@ -17,6 +17,7 @@ module Equality
     #
     # @return [ Integer ] -1, 0, 1.
     def <=>(other)
+      return super unless other.is_a?(Mongoid::Equality)
       attributes["_id"].to_s <=> other.attributes["_id"].to_s
     end
 
diff --git a/spec/mongoid/equality_spec.rb b/spec/mongoid/equality_spec.rb
index 164e8e4922..cfb245a3ae 100644
--- a/spec/mongoid/equality_spec.rb
+++ b/spec/mongoid/equality_spec.rb
@@ -291,6 +291,12 @@
     it "compares based on the document id" do
       expect(first <=> second).to eq(-1)
     end
+    
+    it "doesn't break if one isn't a document" do
+      expect do
+        first <=> "Foo"
+      end.to_not raise_error
+    end
   end
 
   describe "#eql?" do