insert statements supported

lib/arel/nodes/insert_statement.rb

@@ -1,6 +1,6 @@
 module Arel
   module Nodes
-    class InsertStatement
+    class InsertStatement < Arel::Nodes::Node
       attr_accessor :relation, :columns, :values
 
       def initialize

lib/arel/nodes/select_statement.rb

@@ -1,6 +1,6 @@
 module Arel
   module Nodes
-    class SelectStatement
+    class SelectStatement < Arel::Nodes::Node
       attr_reader :cores
       attr_accessor :limit, :orders, :lock, :offset
 

lib/arel/visitors/depth_first.rb

@@ -61,6 +61,13 @@ module Arel
       alias :visit_Time                  :terminal
       alias :visit_TrueClass             :terminal
 
+      def visit_Arel_Nodes_InsertStatement o
+        visit o.relation
+        visit o.columns
+        visit o.values
+        @block.call o
+      end
+
       def visit_Arel_Nodes_SelectCore o
         visit o.projections
         visit o.froms

test/visitors/test_depth_first.rb

@@ -120,6 +120,16 @@ module Arel
           :e,
           ss], @collector.calls
       end
+
+      def test_insert_statement
+        stmt = Nodes::InsertStatement.new
+        stmt.relation = :a
+        stmt.columns << :b
+        stmt.values = :c
+
+        @visitor.accept stmt
+        assert_equal [:a, :b, stmt.columns, :c, stmt], @collector.calls
+      end
     end
   end
 end