insert manager implements "insert"

lib/arel/insert_manager.rb

@@ -12,5 +12,16 @@ module Arel
 
     def columns; @head.columns end
     def values; @head.values end
+
+    def insert fields
+      return if fields.empty?
+
+      @head.relation ||= fields.first.first.relation
+
+      fields.each do |column, value|
+        @head.columns << column
+        @head.values << value
+      end
+    end
   end
 end

lib/arel/select_manager.rb

@@ -26,9 +26,11 @@ module Arel
       self
     end
 
-    def insert stuff
-      viz = Visitors::Dot.new
-      puts viz.accept stuff
+    # FIXME: this method should go away
+    def insert values
+      im = InsertManager.new @engine
+      im.insert values
+      raise
     end
   end
 end

lib/arel/visitors/dot.rb

@@ -28,6 +28,17 @@ module Arel
       end
 
       private
+      def visit_Arel_Nodes_SelectCore o
+        visit_edge o, "froms"
+        visit_edge o, "projections"
+        visit_edge o, "wheres"
+      end
+
+      def visit_Arel_Nodes_SelectStatement o
+        visit_edge o, "cores"
+        visit_edge o, "limit"
+      end
+
       def visit_Arel_Table o
         visit_edge o, "name"
       end
@@ -47,9 +58,14 @@ module Arel
       alias :visit_NilClass :visit_String
 
       def visit_Hash o
-        o.each_with_index do |(k,v),i|
-          edge("key_#{i}")   { visit k }
-          edge("value_#{i}") { visit v }
+        o.each_with_index do |pair, i|
+          edge("pair_#{i}")   { visit pair }
+        end
+      end
+
+      def visit_Array o
+        o.each_with_index do |x,i|
+          edge(i) { visit x }
         end
       end
 

spec/arel/insert_manager_spec.rb

@@ -8,6 +8,32 @@ module Arel
       end
     end
 
+    describe 'insert' do
+      it 'takes a list of lists' do
+        table = Table.new(:users)
+        manager = Arel::InsertManager.new Table.engine
+        manager.into table
+        manager.insert [[table[:id], 1], [table[:name], 'aaron']]
+        manager.to_sql.should be_like %{
+          INSERT INTO "users" ("users"."id", "users"."name") VALUES (1, 'aaron')
+        }
+      end
+
+      it 'defaults the table' do
+        table = Table.new(:users)
+        manager = Arel::InsertManager.new Table.engine
+        manager.insert [[table[:id], 1], [table[:name], 'aaron']]
+        manager.to_sql.should be_like %{
+          INSERT INTO "users" ("users"."id", "users"."name") VALUES (1, 'aaron')
+        }
+      end
+
+      it 'takes an empty list' do
+        manager = Arel::InsertManager.new Table.engine
+        manager.insert []
+      end
+    end
+
     describe 'into' do
       it 'takes an engine' do
         manager = Arel::InsertManager.new Table.engine