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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