Re: Parallel structure EO modeling
Re: Parallel structure EO modeling
- Subject: Re: Parallel structure EO modeling
- From: Ken Anderson <email@hidden>
- Date: Tue, 26 Feb 2013 16:47:19 -0500
Chuck,
I'll probably just have the User object determine valid options for that user - and it can start out be making sure that the Male/Female flags match. Thanks for the idea!
Ken
On Feb 26, 2013, at 3:43 PM, Chuck Hill <email@hidden> wrote:
> Maybe something like having then use a Role object and delegate the validation to object?
>
>
> On 2013-02-26, at 12:38 PM, Ramsey Gurley wrote:
>
>> Can you give a concrete example illustrating what you mean? Generally I stay away from enforcing business rules with the schema. When business rules change, as they always do, you're boned. I use the schema to enforce data integrity.
>>
>> Ramsey
>>
>> On Feb 26, 2013, at 1:11 PM, Ken Anderson wrote:
>>
>>> All,
>>>
>>> I have a difficult decision to make and am waffling back and forth. I'm hoping some of you guys might have come across a similar situation and would have some recommendations.
>>>
>>> I have a model where a number of entities can by applied only to males or only to females (it's an exercise app). Part of me wants to create sub-entities called "Male…" and "Female…" because EOF will effectively validate relationships for me. Unfortunately, it's a pretty deep entity hierarchy and there would be a lot of entities that would have to fall into this category. Not to mention there are join tables that wouldn't have an M/F flag, but to stay consistent would have to be subclassed as well.
>>>
>>> Any thoughts? I would do them all with single table inheritance, so there wouldn't be much of a performance hit.
>>>
>>> Thanks,
>>> Ken
>>>
>>>
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