Added truncation support for Postgresql.

lib/database_cleaner/active_record/truncation.rb

@@ -19,6 +19,13 @@ module ActiveRecord
       end
     end
 
+    class PostgreSQLAdapter
+      def truncate_table(table_name)
+        execute("TRUNCATE TABLE #{table_name};")
+      end
+    end
+
+
   end
 
 end

spec/database_cleaner/active_record/truncation_spec.rb

@@ -3,7 +3,7 @@ require 'database_cleaner/active_record/truncation'
 require 'active_record'
 module ActiveRecord
   module ConnectionAdapters
-    [MysqlAdapter, SQLite3Adapter, JdbcAdapter].each do |adapter|
+    [MysqlAdapter, SQLite3Adapter, JdbcAdapter, PostgreSQLAdapter].each do |adapter|
       describe adapter, "#truncate_table" do
         it "should truncate the table"
       end