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Re: Binding selectable to-many relationship in IB
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Re: Binding selectable to-many relationship in IB


  • Subject: Re: Binding selectable to-many relationship in IB
  • From: mmalc crawford <email@hidden>
  • Date: Sun, 16 Sep 2007 19:41:33 -0700


On Sep 16, 2007, at 6:15 PM, Aaron McFarlane wrote:
First post - taking a stab at learning Core Data and Bindings

As has been said so many times on the list now: don't.
Learn one, then the other: <http://developer.apple.com/documentation/Cocoa/Conceptual/CoreData/Articles/cdBeforeYouStart.html#//apple_ref/doc/uid/TP40004318-SW2 >.



I have clients and services. A client has multiple services, and a service can have multiple clients (I teach music - sometimes group lessons). This is a many-to-many, inverse relationship, correct?

It's inverse if you've set up the inverse.


I have a tableview that shows the services. Each column represents a property of my service entity. First question: How do I get IB to show me the array of clients that correspond to a specific service?


Add an array controller whose contentSet is bound to the clients relationship of the selection of the services array controller.


Secondly, I wanted to ask for advice as to the path of least resistance to providing a UI to selecting multiple clients for a service. I thought that a tokenfield would be nice, but it seems complicated. My next thought was a tableview with checkboxes as a column. I have no idea how to approach either of these ideas - any advice on a similar situation would be greatly appreciated.

If you want to use checkboxes, then add an array controller to manage *all* the Clients, then for the checkbox column use the standard data source methods to get/set the value for the checkbox column (return YES from tableView:objectValueForTableColumn:row: if the client at <row> is in the clients relationship of the currently-selected service; if the value passed in to tableView:setObjectValue:forTableColumn:row: is YES, add the client at <row> to the clients relationship of the currently-selected service if it's absent, etc.).

mmalc

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References: 
 >Binding selectable to-many relationship in IB (From: Aaron McFarlane <email@hidden>)

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