Re: [jira] [Updated] (CAY-1834) Exception: ToManyList cannot be cast to DataObject

[Andrus Adamchik <an...@objectstyle.org>]

So, trunk is finally free from "runtime" ObjRelationships. I kept runtime DbRelationships for now as I don't envision those giving us trouble due to them being based on the same join pairs. And having a graph of DbEntities fully traversable in both directions is kind of important. 

The tricky part was to keep one-way to-many working. So I ended up implementing it differently - via graph change tracking instead of runtime relationships that created hidden object properties (see CAY-1861 commits). This code touches on a few non-trial parts of runtime, so I hope I didn't break anything. So appreciate feedback from early adopters.

Andrus

On Jun 18, 2013, at 5:26 PM, Andrus Adamchik <an...@objectstyle.org> wrote:

> Heh… Runtime relationships were intended to solve a single problem of updating FK in a one-way to-many relationship. But it created so much trouble for everyone instead. Things like vertical inheritance for instance… oh well.
> 
> Andrus
> 
> On Jun 18, 2013, at 10:22 AM, John Huss <jo...@gmail.com> wrote:
> 
>> For what it's worth, I've had this commented out for quite some time now
>> and have been running it in production.  It was necessary because my entity
>> classes are subclasses of PersistentObject rather than CayenneDataObject
>> and they don't have any place to store the generated "runtimeRelationshipX"
>> values.
>> 
>> John
>> 
>> 
>> On Tue, Jun 18, 2013 at 6:21 AM, Andrus Adamchik <an...@objectstyle.org>wrote:
>> 
>>> FYI … another case of runtime rels messing things up. Time to get rid of
>>> them, replacing the functionality with some other algorithm.
>>> 
>>> Andrus
>>> 
>>> 
>>> Begin forwarded message:
>>> 
>>>> ---
>>> a/framework/cayenne-jdk1.5-unpublished/src/main/java/org/apache/cayenne/configuration/server/DataDomainProvider.java
>>>> +++
>>> b/framework/cayenne-jdk1.5-unpublished/src/main/java/org/apache/cayenne/configuration/server/DataDomainProvider.java
>>>> @@ -193,7 +193,7 @@ public class DataDomainProvider implements
>>> Provider<DataDomain> {
>>>>       }
>>>> 
>>>>       dataDomain.getEntityResolver().applyDBLayerDefaults();
>>>> -        dataDomain.getEntityResolver().applyObjectLayerDefaults();
>>>> +        //dataDomain.getEntityResolver().applyObjectLayerDefaults();
>>>> 
>>>>       for (DataNodeDescriptor nodeDescriptor :
>>> descriptor.getNodeDescriptors()) {
>>>>           DataNode dataNode = new DataNode(nodeDescriptor.getName());
>>>> 
>>>> 
>>>> Feel free to create a custom DataDomainProvider with this change and
>>> bind it via DI... On the Cayenne end we'll probably need to get rid of
>>> "runtime" obj relationships. But that's something that will require more
>>> research.
>>> 
>>> 
> 
>