| [CDO 0.8.0 M7] problem retreiving collection [message #122410] |
Tue, 13 May 2008 22:36  |
 Mark Geib
Messages: 432
Registered: July 2009 |
Senior Member |
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Eike,
With Eclipse 3.4, etc release coming soon I have taken up again the
migration to CDO from Teneo.
I am having a problem which keeps me from continuing however.
To help you understand the model assume I have a Library class which
contains a Book class. Then the model has a number of sub-classes of book,
like redBook blueBook. In addition from the Library class there are
references to each sub class of Book. So for example I can retrieve all
the redBooks via a call to getRedBooks() on the Library object. So again,
I have two references to each sub class, one is to the super class Book
and then one to each sub class. In this way I can retrieve all Books or
all RedBooks.
BTW, the Book class is not abstract.
Now, in addition there are references from Book to other collections, like
OldBook or BigBook. As you can imagine I can from a OldBook collection
retrieve all Books via a call to the getBooks() method of OldBook object.
My problem is that if I retrieve all Books from an OldBook object and then
from each indivdual Book call getLibrary() that ALWAYS returns null. I can
not seem to get the Library from a Book.
This does not fail with Teneo, my production system.
Looking forward to your help,
Mark.
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| Re: [CDO 0.8.0 M7] problem retreiving collection [message #122421 is a reply to message #122410] |
Wed, 14 May 2008 06:48  |
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Mark,
If I got you right, it seems like an issue with eContainer() or something
like that. Once there was a Bugzilla about that but I think it was fixed.
Maybe something was missing. Do you think you could provide me with a
small model that can demonstrate the effect. Just an Ecore file attached
to a new Bugzilla would be good.
Cheers
/Eike
geib wrote:
> Eike,
> With Eclipse 3.4, etc release coming soon I have taken up again the
> migration to CDO from Teneo.
> I am having a problem which keeps me from continuing however.
> To help you understand the model assume I have a Library class which
> contains a Book class. Then the model has a number of sub-classes of book,
> like redBook blueBook. In addition from the Library class there are
> references to each sub class of Book. So for example I can retrieve all
> the redBooks via a call to getRedBooks() on the Library object. So again,
> I have two references to each sub class, one is to the super class Book
> and then one to each sub class. In this way I can retrieve all Books or
> all RedBooks.
> BTW, the Book class is not abstract.
> Now, in addition there are references from Book to other collections, like
> OldBook or BigBook. As you can imagine I can from a OldBook collection
> retrieve all Books via a call to the getBooks() method of OldBook object.
> My problem is that if I retrieve all Books from an OldBook object and then
> from each indivdual Book call getLibrary() that ALWAYS returns null. I can
> not seem to get the Library from a Book.
> This does not fail with Teneo, my production system.
> Looking forward to your help,
> Mark.
Cheers
/Eike
----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper
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| Re: [CDO 0.8.0 M7] problem retreiving collection [message #618038 is a reply to message #122410] |
Wed, 14 May 2008 06:48 |
|
Mark,
If I got you right, it seems like an issue with eContainer() or something
like that. Once there was a Bugzilla about that but I think it was fixed.
Maybe something was missing. Do you think you could provide me with a
small model that can demonstrate the effect. Just an Ecore file attached
to a new Bugzilla would be good.
Cheers
/Eike
geib wrote:
> Eike,
> With Eclipse 3.4, etc release coming soon I have taken up again the
> migration to CDO from Teneo.
> I am having a problem which keeps me from continuing however.
> To help you understand the model assume I have a Library class which
> contains a Book class. Then the model has a number of sub-classes of book,
> like redBook blueBook. In addition from the Library class there are
> references to each sub class of Book. So for example I can retrieve all
> the redBooks via a call to getRedBooks() on the Library object. So again,
> I have two references to each sub class, one is to the super class Book
> and then one to each sub class. In this way I can retrieve all Books or
> all RedBooks.
> BTW, the Book class is not abstract.
> Now, in addition there are references from Book to other collections, like
> OldBook or BigBook. As you can imagine I can from a OldBook collection
> retrieve all Books via a call to the getBooks() method of OldBook object.
> My problem is that if I retrieve all Books from an OldBook object and then
> from each indivdual Book call getLibrary() that ALWAYS returns null. I can
> not seem to get the Library from a Book.
> This does not fail with Teneo, my production system.
> Looking forward to your help,
> Mark.
Cheers
/Eike
----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper
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