Do you have a working example of this?
Been playing with this, you get the fieldname (param1) and the field value you were trying to set (param2). I do think the validation engine would allow for more params though. If we do inline edit now, we can't really get anything from the database since all we have is the fieldname and value. If we wanted to check other fields on that record, we don't know which ID we should retrieve.
UPDATE:
Wait: you DO get the full record. There is a fourth parameter, even though the third one is empty. That one will have all the information you need. Will update this post with a tutorial
Been playing with this, you get the fieldname (param1) and the field value you were trying to set (param2). I do think the validation engine would allow for more params though. If we do inline edit now, we can't really get anything from the database since all we have is the fieldname and value. If we wanted to check other fields on that record, we don't know which ID we should retrieve.
UPDATE:
Wait: you DO get the full record. There is a fourth parameter, even though the third one is empty. That one will have all the information you need. Will update this post with a tutorial