On 1 November 2011 10:10, Johan Andries <[email protected]> wrote:
> Hi,
>
> if I do an object action using the json-viewer, is there a way to get a
> list of all the the objects whose state has been changed as a side-effect
> of that action?
Good question. The short answer is no, not currently. But it could...
> That way the impacted object views can be updated in the
> javascript application.
> Is this kind of system used in the DnD
> implementation?
Yes... more generally, there is an ObjectNotifier component that keeps
track of dirtied objects, and this can be used to notify the viewers to
repaint themselves.
So the information is there. But we need to figure out how to return it.
The obvious thing to do is to add a custom extension, eg:
"extensions": {
"changedObjects": [
{ "rel": "domainObject", "href": "http://localhost:8080/objects/OID-123";
...},
{ "rel": "domainObject", "href": "http://localhost:8080/objects/OID-456";
...},
]
}
However, one snag is that, in the case of an action returning a single
domain object, the RO spec says to return the domain object itself, rather
than a representation of an action result that references the domain
object. My gut feeling is that, if we were to use extensions as I describe
above, then it would be wrong to put that "changedObjects" list on the
domain object's representation; they really belong to the results of the
action.
Thus, I'm thinking we would need to change to the RO spec, so that an
action always returns its own representation. (Indeed, even a void action
should return a representation, now that I think of it... to indicate any
changed objects).
Richard... what's your view?
Dan
> Any hints?
>
> Thank you!
>
> Johan.
>
