[baseten-users] one-to-many relationship strange behavior

[Michael Ruepp]

Hi there,

I have some Problems creating a simple two entities one-to-many  
relationship just in IB like I saw it in a Tutorial for CoreData.
It don´t work as expected:


Entity one is "Projects" with a to many relationship to "ProjectItems".

- to-many Relationship of Projects to ProjectItems is called  
"ProjectItems"
- to-one Rel. of ProjectItems to Projects is called "Projects"

Both Entities just have the Properties "name".

I have two NSTableViews, a Database Context and two  
BXSynchronisedArrayControllers, one named "Projects", the other  
"ProjectItems-Projects".

Both are connected to the DBContext. Both have the names of their  
TableNames properly set up.

The "Project" Controller has "Fetch automatically clicked on, the  
"ProjectItems-Projects" Controller not.

I bound the ContentSet of the ProjectItem-Projects Controller to the  
Project Controller with selection and the KeyPath name of the  
relationship "ProjectItem"

I bound the "name" column of the Projects TableView to the Projects  
Controller, arrangedObjects with Keypath "name".
I bound the "name" column of the ProjectItems TableView to the  
ProjectItems-Projects Controller, arrangedObjects with Keypath "name".

I have four buttons, plus and minus for Projects and plus and minus  
for ProjectItems. I added the add/remove Connection to the respective  
Controllers.

So Database Connection is working, I am able to create Projects, but  
when I try to create ProjectItems, nothing happens.

Funny enough, whan I change the Data Model to a many-to-many  
relationship (Both sides cascade on delete) , I am able to create  
Projects and ProjectsItems and Selection behavior is as excpected (eg.  
Select a Project shows the respective ProjectItems created with the  
Project selected).

But when I delete a Project, the respective ProjectItems are not  
deleted as well, they reside in the Database without relationship.


Is this a bug or am I expecting something wrong? I created a coredata  
Project that way and it works perfectly. I tried also to use Content  
Array because in the documentation is something about "returns a  
collection", but I really am confused about the way I should create a  
one to many relationship.


Hopefully, somebody reads this, seems that the Baseten mailinglist is  
somehow an empty one-way datahighway into nothingness :-) It is

Thanks,

Mike