def get(self, id, pk='id', deleted=False):
        try:
            if pk == 'id':
                id = int(id)
            if deleted:
                spec = {pk: id}
            else:
                spec = {pk: id, 'data': {'$exists': 1}}
            fields = {'_id': 0}
            row = self.db.docs.find_one(spec, fields)
        except Exception as e:
            raise DatabaseException(e)
        if row:
            return Document(**row)
        raise NotFoundError('%s %s not found' % (pk, id))
def post(txt, contact, parenttype=None, notify=False, subject=None):
	"""post message"""

	d = frappe.new_doc('Communication')
	d.communication_type = 'Notification' if parenttype else 'Chat'
	d.subject = subject
	d.content = txt
	d.reference_doctype = 'User'
	d.reference_name = contact
	d.sender = frappe.session.user
	d.insert(ignore_permissions=True)

	delete_notification_count_for("Messages")

	if notify and cint(notify):
		if contact==frappe.session.user:
			_notify([user.name for user in get_enabled_system_users()], txt)
		else:
			_notify(contact, txt, subject)

	return d