There are a couple of problems:
1) The tree controller manages content of a single entity type - you
have two different entity types. One way around this is to make both
entities sub-entities of another entity.
2) Your relationships don't follow Cocoa naming conventions
(categoryRel versus category_rel) which has implications in Key-
Value Coding.
3) The Children key path must be implemented (even if it just
returns nil) by every object the tree controller manages. So, if you
have a Category as the root of the tree, and Projects as its
children, the Projects must implement the Children key path as well
as the Category.
There's a recently published sample code that might give you some
additional insight, http://developer.apple.com/samplecode/AbstractTree/
Wil
On Jan 15, 2008, at 9:03 PM, Chris Schmitt wrote:
Hello,
I have two core data entities, Category and Project. Category is
related to Project using the "project_rel" (one to many). Project
is related to Category using the "category_rel". The inverse is
set for both of them. So basically I want to list all projects
within a category.
I have a tree controller that is setup using the following bindings:
Object Controller: Mode=>Entity Entity Name=> Category
Key Paths: Children => project_rel
Last but not least, I have a button hooked up to the add method on
the NSTreeController. I have also tried the addChild method, and
written my own method to programmatically add the category entity
and all result in the same error. When I click the button I get
the following error: the entity Category is not key value coding-
compliant for the key Project
This has got me stumped and everything I find says that I have this
setup correctly.
Thanks in advance
_______________________________________________
Cocoa-dev mailing list (email@hidden)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden
_______________________________________________
Cocoa-dev mailing list (email@hidden)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden
