Re: Horizontal inheritance
Re: Horizontal inheritance
- Subject: Re: Horizontal inheritance
- From: Chuck Hill <email@hidden>
- Date: Mon, 4 Jan 2010 07:58:29 -0800
On Jan 3, 2010, at 12:18 PM, Mark Wardle wrote:
Hi.
I have an "Encounter" <->> "Form" relationship.
However, a "Form" is an abstract entity with a number of concrete
subclasses.
EOGenerator generates the methods "forms()" and "forms(EOQualifier
qual)".
I'd like to get a list of the form types of a specific subclass.
/**
* Returns all of the forms of the specified type
*/
public NSArray<Form> forms(Class<? extends Form> formClass) {
NSMutableArray<Form> forms = new NSMutableArray<Form>();
for (Form f : forms()) {
if (formClass.isInstance(f)) {
forms.add(f);
}
}
return forms;
}
Surely there's a better way that this?
Am I missing something obvious here with EOF/WO inheritance?
I can see three choices: model, fetch, or filter (as you are doing
above). It would be more general purpose to use the entity name,
rather than the class, to filter on. You could do something like this:
public NSArray<Form> forms(String entityName) {
return forms(ERXQ.eq("entityName", entityName));
}
ERXQ assumes you are using Wonder.
Chuck
--
Chuck Hill Senior Consultant / VP Development
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/products/practical_webobjects
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