Thanks both, This advice is all very helpful. I might do some performance measurement to see whether keeping horizontal inheritance is actually causing problems. I think I'm batch fetching which should mean joining on multiple tables and not a SELECT on each and every entity.
The problem is that with single table inheritance, combining all data forms, I will end up with a database table with 449 columns - which might have its own set of problems! Out of curiosity, am I going to hit any problems combining approaches? Using single table inheritance when there are many common properties and using horizontal inheritance when the majority of properties are not shared. What I should do instead is write a generic entity which itself stores a runtime-defined, stored in the database (and modelling in EOF) bunch of properties in an NSDictionary and has logic provided a runtime chosen delegate. Then I could create new data collection forms using a dedicated UI and little overhead. Then we'd just set-up a bunch of D2W rules to ask the generic entity for displayPropertyKeys etc. for the appropriate fake entity. Anyone created fake entities like this either? Best wishes, Mark On 4 Oct 2013, at 19:23, Chuck Hill <ch...@global-village.net> wrote: > On 2013-10-04 11:06 AM, "Ramsey Gurley" wrote: > > Not to contradict Chuck (he is always right), > > Will someone PLEASE tell my wife? > > > -- > Chuck Hill > Executive Managing Partner, VP Development and Technical Services > > Practical WebObjects - for developers who want to increase their overall > knowledge of WebObjects or who are trying to solve specific problems. > http://www.global-village.net/gvc/practical_webobjects > > Global Village Consulting ranks 13th in 2012 in BIV's Top 100 Fastest Growing > Companies in B.C! > > Global Village Consulting ranks 44th in 25th annual PROFIT 500 ranking of > Canada’s Fastest-Growing Companies by PROFIT Magazine! -- Dr. Mark Wardle Consultant Neurologist, University Hospital Wales, Cardiff, UK Email: mark.war...@wales.nhs.uk or m...@wardle.org Twitter: @mwardle Telephone: 02920745274 (secretary) or facsimile: 02920744166
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