module ActiveRecord::ConnectionAdapters::PostgreSQLAdapter::ReferentialIntegrity

def disable_referential_integrity #:nodoc:
  if supports_disable_referential_integrity?
    begin
      execute(tables.collect { |name| "ALTER TABLE #{quote_table_name(name)} DISABLE TRIGGER ALL" }.join(";"))
    rescue
      execute(tables.collect { |name| "ALTER TABLE #{quote_table_name(name)} DISABLE TRIGGER USER" }.join(";"))
    end
  end
  yield
ensure
  if supports_disable_referential_integrity?
    begin
      execute(tables.collect { |name| "ALTER TABLE #{quote_table_name(name)} ENABLE TRIGGER ALL" }.join(";"))
    rescue
      execute(tables.collect { |name| "ALTER TABLE #{quote_table_name(name)} ENABLE TRIGGER USER" }.join(";"))
    end
  end
end

def supports_disable_referential_integrity? #:nodoc:
  true
end