[Erp5-dev] guard agains concurrent edits

[Boris Kocherov]

Hi. Witam

Jean-Paul Smets пишет:
> Hi,
> 
> The clean way to handle this is to define in a workflow who is
> responsible of editing objects at a given time.  This is the only way
> which garantees everything.
> 
> It could be useful though to display warnings in certain cases (ie.
> based on modification date as you suggested).

Does it mean that user have run action for document edit? If so, How 
should server know that user leaves edit mode or closes the browser window?

> 
> Regards,
> 
> JPS.
> 
> bartek a écrit :
>> Hi,
>>
>> Would it be feasible to implement a kind of a "guard" against concurrent
>> edits of the same object? I mean this: if I open a form to edit, and
>> while I'm typing another guy opens the same form, edits and saves, then
>> when I save the form the other guy's changes will be silently
>> overwritten, and nobody would be notified. In a multi-user environment
>> this can cause serious issues.
>>
>> I see two ways to solve it: first is MoinMoin-like, the other would be
>> to store original data and load time in a form and upon submission
>> checking if modification date has been changed, and if so then it would
>> be possible to check if there are conflicts.
>>
>> What do you think?

On my opinion the MoinMoin version is better. As the document fields are 
linked between each other only user should to decide which data would be 
saved.

So the person who saved the document latter get the possibility to 
resolve the collision. The user who saved the document before must get 
the notification (i.e. by email) that the collision occurred and what 
was the result.

Regards, Pozdrawiam

Boris Kocherov