Re: Help: Data Modelling, NSTreeController and NSBrowser
Re: Help: Data Modelling, NSTreeController and NSBrowser
- Subject: Re: Help: Data Modelling, NSTreeController and NSBrowser
- From: John Harte <email@hidden>
- Date: Thu, 5 Oct 2006 11:36:00 -0400
On Oct 4, 2006, at 2:01 AM, Lachlan Deck wrote:
Hi John,
On 04/10/2006, at 1:54 PM, John Harte wrote:
On Oct 2, 2006, at 9:36 PM, Lachlan Deck wrote:
I have an entity defined called Category which has:
+ Attributes:
- name (String)
+ Relationships:
- category [toOne, Category optional]
- subcategories [toMany, Category, optional]
From within Interface Builder I've instantiated an
NSTreeController with bindings:
- Entity: Category (Automatically prepares content)
- Children keypath: subcategories
- Predicate: category == nil
- managedObjectContext: (Bind ticked)
- Bind to: AppDelegate
- modelKeyPath: managedObjectContext
And the NSBrowser:
- content:
- Bind to: TreeController
- controller key: arrangedObjects
- contentValues:
- Bind to: TreeController
- controller key: arrangedObjects
- Model key path: name
I don't know if this is the problem but in my NSBrowser I also have
- selectionIndexPaths
- Bind to: TreeController
- Controller Key: selectionIndexPaths
Thanks very much for the suggestion. Unfortunately, I'm still
getting the same error.
Any other ideas? What bindings do you have?
Here are the steps I used to get a document based browser to work:
Steps to create an NSBrowser view with core data.
New Project
Core Data Document-based Application
Edit Model (MyDocument.xcdatamodel)
Add Entity
Add Attribute: "name"
Type: String
Default Value: "name"
Add Relationship: "parent"
Destination: "Entity"
Add Relationship: "children"
Destination: "Entity"
To-Many Relationship
Inverse: "parent"
Open MyDocument.nib
Add NSTreeController to nib
Attributes
Mode: Entitiy
Entity Name: "Entity"
Child Key Path: "children"
Binding
Parameters
managedObjectContext
Bind To: File's Owner (MyDocument)
Model Key Path: managedObjectContext
Remove NSTextField from window
Add NSBrowser
Bindings
Browser Content
content
Bind To: NSTreeController
Controller Key: arrangedObjects
Model Key Path: Leave Blank
contentValues
Bind To: NSTreeController
Controller Key: arrangedObjects
Model Key Path: "name"
selectionIndexPaths
Bind To: NSTreeController
Controller Key: selectionIndexPaths
Model Key Path: Leave Blank
Add Button
Attributes
Title: "Add"
Connection
Target NSTreeController's add: action
Binding
Availability
enabled
Bind To: NSTreeController
Controller Key: canAdd
Model Key Path: Leave Blank
Add Button
Attributes
Title: "Add Child"
Connection
Target NSTreeController's addChild: action
Binding
Availability
enabled
Bind To: NSTreeController
Controller Key: canAddChild
Model Key Path: Leave Blank
I tried it with a non document based project and it worked.
Hope this helps.
John
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