NSArrayController and tables: the "All" item and indirect relationship sets
NSArrayController and tables: the "All" item and indirect relationship sets
- Subject: NSArrayController and tables: the "All" item and indirect relationship sets
- From: Davide Benini <email@hidden>
- Date: Sat, 10 Sep 2005 16:29:56 +0200
Hello to all the folks in this list.
Before asking my first question I'll introduce myself; not sure it's
the policy here, but just in case...
I am PhD candidate in University of Verona, Italy. I study Irish
literature, and in particular the influence of the oral tradition on
contemporary writing. Coding and building websites is a hobby; cocoa
obj-c is my first attempt after many years; some ten years ago, as a
teen, I toyed with variousa basics, pascal and the glorious AMOS on
Amiga.
Now I am building a reference database. It's a bit more complex than
the average book database, since it records also passages and topic-
key for them; it's like a card-index, targeted at academic scholars
and researchers. I developed such a database with filemakerl; now I
want to make a native cocoa application, and I've just started
implementing it. The engine in itself works well, thanks to the core-
data architecture. I am presently building an iTunes-like interface
to browse through keys-books-passages (in this order, from left to
right), using cocoa bindings.
Now, the questions(s):
1) The "All" item
I have to implement the "All" item, to select all keys, all books,
ect. What is the neatest way to do that? I thought about subclassing
the NSArrayController, but it's just a vague idea... Can anyone give
me some hint, or point me to a useful example?
2) Bindings for "Indirect relationships"
The relationship scheme of my core data model is:
books <-->> passage <<-->> topic
Yet my browser follows the order topic - book - passage.
The relationship between books and topics is not direct; for this
reason I cannot use the simple contentSet binding in the book
NSArrayController. Of course I could subclass NSArrayController and
override add a method that yelds a NSSet of books that contains
passages related to a given topic... Is this the smartest way to do
that? I am trying to write as little code as possible, and rely on
bindings...
Thank you very much for your attention; any suggestion is welcome.
Davide Benini
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