using the last seen column for quoting

lib/arel/visitors/to_sql.rb

@@ -6,11 +6,13 @@ module Arel
       def initialize engine
         @engine         = engine
         @connection     = nil
+        @last_column    = []
         @quoted_tables  = {}
         @quoted_columns = {}
       end
 
       def accept object
+        @last_column = []
         @engine.connection_pool.with_connection do |conn|
           @connection = conn
           visit object
@@ -226,6 +228,7 @@ module Arel
       end
 
       def visit_Arel_Attributes_Attribute o
+        @last_column.push o.column
         join_name = o.relation.table_alias || o.relation.name
         "#{quote_table_name join_name}.#{quote_column_name o.name}"
       end
@@ -238,7 +241,7 @@ module Arel
       alias :visit_Arel_Nodes_SqlLiteral :visit_Fixnum
       alias :visit_Arel_SqlLiteral :visit_Fixnum # This is deprecated
 
-      def visit_String o; quote(o) end
+      def visit_String o; quote(o, @last_column.pop) end
 
       alias :visit_ActiveSupport_Multibyte_Chars :visit_String
       alias :visit_BigDecimal :visit_String

spec/insert_manager_spec.rb

@@ -37,7 +37,10 @@ module Arel
         manager = Arel::InsertManager.new Table.engine
 
         time = Time.now
-        manager.insert [[table[:id], time]]
+        attribute = table[:id]
+        attribute.column.type = :date
+
+        manager.insert [[attribute, time]]
         manager.to_sql.should be_like %{
           INSERT INTO "users" ("id") VALUES (#{Table.engine.connection.quote time})
         }

spec/support/fake_record.rb

@@ -39,6 +39,11 @@ module FakeRecord
     end
 
     def quote thing, column = nil
+      if column && column.type == :integer
+        return 'NULL' if thing.nil?
+        return thing.to_i
+      end
+
       case thing
       when true
         "'t'"

spec/visitors/to_sql_spec.rb

@@ -13,6 +13,12 @@ module Arel
           sql = @visitor.accept Nodes::Equality.new(false, false)
           sql.should be_like %{ 'f' = 'f' }
         end
+
+        it 'should use the column to quote' do
+          table = Table.new(:users)
+          sql = @visitor.accept Nodes::Equality.new(table[:id], '1-fooo')
+          sql.should be_like %{ "users"."id" = 1 }
+        end
       end
 
       it "should visit_DateTime" do
@@ -55,7 +61,9 @@ module Arel
       end
 
       it "should visit_TrueClass" do
-        @visitor.accept(@attr.eq(true)).should be_like %{ "users"."id" = 't' }
+        test = @attr.eq(true)
+        test.left.column.type = :boolean
+        @visitor.accept(test).should be_like %{ "users"."id" = 't' }
       end
 
       describe "Nodes::In" do
@@ -91,6 +99,7 @@ module Arel
       describe 'Equality' do
         it "should escape strings" do
           test = @attr.eq 'Aaron Patterson'
+          test.left.column.type = :string
           @visitor.accept(test).should be_like %{
             "users"."id" = 'Aaron Patterson'
           }