Added work-around for PostgreSQL and the problem of getting fixtures to be created from id 1 on each test case. This only works for auto-incrementing primary keys called "id" for now #359 [Scott Baron]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@257 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

@@ -1,5 +1,8 @@
 *SVN*
 
+* Added work-around for PostgreSQL and the problem of getting fixtures to be created from id 1 on each test case.
+  This only works for auto-incrementing primary keys called "id" for now #359 [Scott Baron]
+
 * Added Base#clear_association_cache to empty all the cached associations #347 [Tobias Luetke]
 
 * Added more informative exceptions in establish_connection #356 [bitsweat]

activerecord/lib/active_record/fixtures.rb

@@ -166,12 +166,30 @@ class Fixtures < Hash
         fixtures.each { |fixture| fixture.insert_fixtures }
       end
 
+      reset_sequences(connection, table_names) if ActiveRecord::ConnectionAdapters::PostgreSQLAdapter === connection
+
       return fixtures.size > 1 ? fixtures : fixtures.first
     ensure
       ActiveRecord::Base.logger.level = old_logger_level
     end
   end
 
+  # Work around for PostgreSQL to have new fixtures created from id 1 and running.
+  def self.reset_sequences(connection, table_names)
+    table_names.flatten.each do |table|
+      table_class = Inflector.classify(table.to_s)
+      if Object.const_defined?(table_class)
+        pk = eval("#{table_class}::primary_key")
+        if pk == 'id'
+          connection.execute(
+            "SELECT setval('public.#{table.to_s}_id_seq', (SELECT MAX(id) FROM #{table.to_s}), true)", 
+            'Setting Sequence'
+          )
+        end
+      end
+    end
+  end
+
   def initialize(connection, table_name, fixture_path, file_filter = DEFAULT_FILTER_RE)
     @connection, @table_name, @fixture_path, @file_filter = connection, table_name, fixture_path, file_filter
     @class_name = Inflector.classify(@table_name)