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groups = Column(verbose_name=u"Uprawnienia", orderable=False, accessor='name', empty_values=())

def render_groups(self, record):
	if record.groups is not None:
		return ', '.join([group.name for group in record.groups.all()])
	return '-'

class Meta:
	model = Agent
	fields = ('username', 'first_name', 'last_name', 'email', 'groups')