to_sql visitor started

1 files changed, 38 insertions, 0 deletions

diff --git a/lib/arel/visitors/to_sql.rb b/lib/arel/visitors/to_sql.rb
new file mode 100644
index 0000000000..ba92ca7ef1
--- /dev/null
+++ b/lib/arel/visitors/to_sql.rb
@@ -0,0 +1,38 @@
+module Arel
+  module Visitors
+    class ToSql
+      def initialize engine
+        @engine     = engine
+        @connection = nil
+      end
+
+      def accept object
+        @connection = @engine.connection
+        visit object
+      end
+
+      private
+      def visit_Arel_Nodes_Equality o
+        "#{visit o.left} = #{visit o.right}"
+      end
+
+      def visit_Arel_Attributes_Integer o
+        "#{quote_table_name o.relation.name}.#{quote_column_name o.name}"
+      end
+
+      def visit_Fixnum o; o end
+
+      def visit object
+        send :"visit_#{object.class.name.gsub('::', '_')}", object
+      end
+
+      def quote_table_name name
+        @connection.quote_table_name name
+      end
+
+      def quote_column_name name
+        @connection.quote_column_name name
+      end
+    end
+  end
+end