> On Mar 29, 2018, at 2:47 PM, Esteban A. Maringolo <
[hidden email]> wrote:
>
> This is a question best suited to the Glorp mailing list (which I'm
> cc'ing in this email).
>
> What you need is an HorizontalTypeResolver, and define a common class
> as the ancestor for both of your classes.
> You'll have to define a descriptor for it, and you will use it to
> reference the "parent" of these (e.g. AbstractQuestion).
>
> So in your Glorp Descriptor you'll end up with something like:
>
> QuestionDescriptorSystem>>#typeResolverForAbstractQuestion
> ^(HorizontalTypeResolver forRootClass: AbstractQuestion)
>
> QuestionDescriptorSystem>>#descriptorForAbstractQuestion: aDescriptor
> "..."
> (self typeResolverFor: AbstractQuestion) register: aDescriptor
> abstract: true.
>
> QuestionDescriptorSystem>>#descriptorForQuestion: aDescriptor
> "..."
> (self typeResolverFor: AbstractQuestion) register: aDescriptor.
>
>
> QuestionDescriptorSystem>>#descriptorForQuestionGroup: aDescriptor
> "..."
> (self typeResolverFor: AbstractQuestion) register: aDescriptor.
>
> Then
> classModelForSection: aClassModel
> aClassModel newAttributeNamed: #questions collectionOf: AbstractQuestion
>
> I don't know about your model, but if both classes work
> polymorphically and have a common semantic root (it is "Question"), it
> is hard for me to see why they don't have a common ancestor.
>
> Disclaimer: the above code was written without testing it, based on my
> memory only :)
>
> Regards,
>
> Esteban A. Maringolo
>
>
> 2018-03-29 11:43 GMT-03:00 Alejandro Infante <
[hidden email]>:
>> Hi guys!
>>
>> I’m trying to use GLORP and I’m having problems defining the class model for a class which has an instance variable which is a collection of instances of two different classes:
>>
>> I have 3 classes named: { Section . Question . QuestionGroup } and I have problems for specifying the glorp class model for Section.
>> Object subclass: #Section
>> instanceVariableNames: ‘questions ...'
>> classVariableNames: ''
>>
>> The thing is that #questions instance variable is a collection of Question AND QuestionGroup. They have polymorphic behavior, but they have not a common superclass (besides Object).
>>
>> How does my class model should look like?
>>
>> classModelForSection: aClassModel
>> ...
>> aClassModel newAttributeNamed: #questions collectionOf: ****?.
>>
>>
>> Thanks for the help!
>> Cheers,
>> Alejandro
>
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