Is there any shared functionality between Entity A, Entity B, Entity C and Entity D that would justify Abstract Entity Alpha?
Steve On Nov 6, 2010, at 7:39 AM, Farrukh Ijaz wrote: > Hi EOF-ologists, > > I've a modelling issue and need to know what could be the suitable fix (or > tweak) to fulfil the requirement. > > Below is the existing EO Model. > <Existing.png> > I've two entities (Entity A and Entity B) extending Abstract Entity X but > these entities have their own tables (no single table inheritance). I need to > design Entity D and Entity E where Entity D has a toMany relationship with > Entity E and Entity E needs to have a toOne relationship with Entity A, > Entity B, Entity C and Entity D. > > 1. One way can be for Entity E to have four different relationships such as > toEntityA, toEntityB, toEntityC and toEntityD. (This is _not_ desirable) > 2. The other way mentioned in the lower diagram where Entity A, Entity B, > Entity C and Entity D extend Abstract Entity X and Entity E will have toOne > relationship with Abstract Entity X. (This is _desirable_). > <Desired.png> > What would be the easiest way to model such relationship? I'm _not_ > relationship expert so may be the way I assumed the model (second diagram) > can be wrong or practically impossible? > Also note that I cannot make Entity C and Entity D to extend Abstract Entity > X due to some design constraints therefore I think to introduce Abstract > Entity Alpha. > > Thanks, > > Farrukh > > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/webobjects-dev/speery%40me.com > > This email sent to spe...@me.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/webobjects-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
