Cache visitor dispatch on a per-visitor basis

1 files changed, 22 insertions, 0 deletions

diff --git a/test/visitors/test_dispatch_contamination.rb b/test/visitors/test_dispatch_contamination.rb
new file mode 100644
index 0000000000..d3c9e8af2e
--- /dev/null
+++ b/test/visitors/test_dispatch_contamination.rb
@@ -0,0 +1,22 @@
+require 'helper'
+
+module Arel
+  module Visitors
+    describe 'avoiding contamination between visitor dispatch tables' do
+      before do
+        @connection = Table.engine.connection
+        @table = Table.new(:users)
+      end
+
+      it 'dispatches properly after failing upwards' do
+        node = Nodes::Union.new(Nodes::True.new, Nodes::False.new)
+        assert_equal "( TRUE UNION FALSE )", node.to_sql
+
+        node.first # from Nodes::Node's Enumerable mixin
+
+        assert_equal "( TRUE UNION FALSE )", node.to_sql
+      end
+    end
+  end
+end
+