Re: Non class properties
Re: Non class properties
- Subject: Re: Non class properties
- From: Chuck Hill <email@hidden>
- Date: Thu, 13 Jan 2011 15:19:44 -0800
From Wonder's ERXCustomObject:
protected String _primaryKey = null;
public String primaryKey() {
if(_primaryKey == null) {
_primaryKey = ERXEOControlUtilities.primaryKeyStringForObject(this);
}
return _primaryKey;
}
For relationships, call this on the related object or NSArray of related objects (e.g. tests.valueForKey("primaryKey")).
Chuck
On Jan 13, 2011, at 2:39 PM, Mark Wardle wrote:
> Hi.
>
> I've written a webobjects export to file-based database framework that supports exporting multiple entities to both MS Access and multiple CSV files wrapped up as a CSV file. I don't simply want to export the raw rows or use SQL directly as I need to use logic from the WebObjects side of things (e.g. only downloading information about patients registered with a certain research project when such membership is not simply modelled relationally but by a complex series of consent forms linked to the patient entity via encounter entities). I subsequently use these exported data for specific audit and research / analysis purposes. (I don't want to have to re-write some of this business logic in R for example).
>
> Each table is built using an entity, a qualifier and (optionally) a list of keypaths although the latter will default to the attributes for the entity by default.
>
> All is fine for class properties and everything is exported nicely using either file-based database backend. These values are obviously returned by simply using valueForKeyPath(). Users choose a download format and the database is exported and they receive a message when the export is complete - they then have a link to download and can use this (anonymised, all patient-identifiable information removed) for offline analysis.
>
> The problem is non-class properties.
>
> I need to include arbitrary EO properties (that may invoke complex java logic), EO attributes (standard class properties) and relationships *as well as* non-class properties such as primary keys and foreign keys.
>
> My naive approach was this:
>
> protected static Object valueForKeyPath(Object object, String keyPath) {
> Object value = null;
> try {
> value = NSKeyValueCodingAdditions.Utility.valueForKeyPath(object, keyPath);
> }
> catch(NSKeyValueCoding.UnknownKeyException e) {
> int index = keyPath.indexOf('.');
> Object src = object;
> if (index >= 0) {
> String path = ERXStringUtilities.keyPathWithoutLastProperty(keyPath);
> src = NSKeyValueCodingAdditions.Utility.valueForKeyPath(src, path);
> }
> String key = ERXStringUtilities.lastPropertyKeyInKeyPath(keyPath);
> if (src instanceof EOEnterpriseObject) {
> NSDictionary<String, Object> snapshot = ((EOEnterpriseObject) src).snapshot();
> value = snapshot.valueForKey(key);
> }
> }
> return value;
> }
>
> Although clearly this does not work as the snapshot doesn't contain the non-class properties either.
>
> Is it possible to get at the raw row dictionary from an enterprise object or am I better to fetch the raw rows first, upgrade this into an EO and then fallback to the raw row if the key is not found?
>
> Or is there an easier way to get at non-class properties?
>
> Many thanks,
>
> Mark
>
> --
> Dr. Mark Wardle
> Specialist registrar, Neurology
> Cardiff, UK
>
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--
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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