Add equality to ALL THE THINGS (that matter)

People are often trying to use ARel nodes inside ActiveRecord, and when
they do so, lots of things can break, because ActiveRecord relies on
Array#uniq and sometimes hash key equality to handle values that end up
in wheres, havings, etc. By implementing equality for all the nodes, we
should hopefully be able to prevent any nodes (even nodes containing
other nodes) from failing an equality check they should otherwise pass,
and alleviate many of these errors.

Fixes #130

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/arel/nodes/true.rb b/lib/arel/nodes/true.rb
index 63dd5562e1..082963e5e6 100644
--- a/lib/arel/nodes/true.rb
+++ b/lib/arel/nodes/true.rb
@@ -1,6 +1,13 @@
 module Arel
   module Nodes
     class True < Arel::Nodes::Node
+      def hash
+        self.class.hash
+      end
+
+      def eql? other
+        self.class == other.class
+      end
     end
   end
 end