Add nodes for boolean constants

This is useful for dynamically created predicates e.g:

expr1 = table.create_false
expr2 = table.create_false

expr1 = create_a_predicate() if some_condition
expr2 = create_another_predicate() if some_other_condition

table.where(expr1.and(expr2))

1 files changed, 8 insertions, 0 deletions

diff --git a/lib/arel/visitors/to_sql.rb b/lib/arel/visitors/to_sql.rb
index 933edc15f2..8aec4cb147 100644
--- a/lib/arel/visitors/to_sql.rb
+++ b/lib/arel/visitors/to_sql.rb
@@ -90,6 +90,14 @@ key on UpdateManager using UpdateManager#key=
           o.alias ? " AS #{visit o.alias}" : ''}"
       end
 
+      def visit_Arel_Nodes_True o
+        "TRUE"
+      end
+
+      def visit_Arel_Nodes_False o
+        "FALSE"
+      end
+
       def table_exists? name
         @pool.table_exists? name
       end