if anyone knows an answer to this, i would still very much like to
hear it.
however i have just changed my web service to not return the AR Model
objects.
so my update method now does this (psedocode):
Update(ThingyData data)
{
Thingy thingy = GetThingyFromDB(data.Id);
UpdateThingyFromData(thingy, data);
UpdateThingyInDB(thingy);
}
which is probably the "right" way to do it anyway, so that my client
isn't tied to my DB Model
On Jun 3, 10:20 am, MattF <[email protected]> wrote:
> what would be nice is if i could put some thing into it so that before
> it goes to update any object, if it doesn't have the current state of
> the object it goes and retrieves it from the DB in a way which would
> mean that my postupdate has the OldState.
>
> this way my actual web method could stay how it is (free of any of
> this logic)
>
> On Jun 3, 10:11 am, MattF <[email protected]> wrote:
>
>
>
> > This has probably been asked before, but i couldn't find a existing
> > post explaining it.
>
> > Currently we have a web service which is accessed by our client
> > application in order to talk to the database.
>
> > The asmx WebService has web methods similar to this (this is a
> > simplification):
> > NOTE: Thingy is an AR Model
>
> > [WebMethod]
> > public Thingy GetThingy(int id)
> > {
> > return ActiveRecordMediator<Thingy>.FindByPrimaryKey(id);
>
> > }
>
> > [WebMethod]
> > public Thingy UpdateThingy(Thingy thingy)
> > {
> > ActiveRecordMediator<Thingy>.Update(thingy);
> > return thingy;
>
> > }
>
> > there is also some other code in another part of the code which
> > basically creates a SessionScope for each web request.
>
> > Now, this code seemed to work at first (updated the DB appropriately).
> > However then i added an IPreUpdateEventListener which is basically
> > used to log which properties on each object where changed.
>
> > The problem that i had is in the OnPostUpdate(PostUpdateEvent
> > postUpdateEvent) method of my EventListener postUpdateEvent.OldState
> > is always null.
>
> > After some research and asking questions i have worked out that this
> > is because when calling the Update web method, the 'thingy' that is
> > passed in is a detatched model (not attatched to the current session)
> > so AR has no way of knowing the previous values of the Thingy (which
> > makes sense).
>
> > however i need to find some way of updating the thingy in the
> > database, but still being able to know which properties where changed
> > in that row of the database.
>
> > I understand that i may have to do a FindByPrimaryKey before i do the
> > update so that AR can know the state of the object before the update.
> > but i couldn't get it to work by just doing a find and then an update
> > on the object passed in as the parameter.
>
> > p.s. i realize i could probably get it to work by doing a Find, then
> > updating the returned object manually from the object passed in (and
> > then saving the object returned from the find)... but i don't want to
> > have to update the object manually, because this is going to have to
> > be done for many-many different models, so i need a method that is not
> > fragile and can be done pretty simply for any type
>
> > thanks in advance
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