Hello,
I sent this just before the Easter break but didn't receive a
reply. I thought I'd try again now that we're all back at work.
I have what, in WebObjects, we used to call a master-slave
display. I show a list of specific Products based on the
selected Product Model, hereafter referred to as the 'Model'. So
when a user picks a certain Model of sunglasses in the master
list, she sees all the different size/color/lens combinations
(Products) in the slave list. It works nicely.
I use a contentSet binding (programmatically-generated if that
makes a difference) to filter the slave list ie. bind it to the
to-many relationship from Model to Products. **
In the slave (Product) list, I have a popup that allows the user
to change a Product's Model. The popup is usually only used to
fix data entry errors - e.g. specifying the wrong Model for a Product.
Here is my problem. I noticed that changing the Model results
in two exception:
NSRangeException -- Cannot remove an observer
<NSKeyValueObservance 0x30bacf0> for the key path "currentCost"
from <Model 0x2a159a0> because it is not registered as an observer.
and
NSInternalInconsistencyException -- Cannot remove an observer
<ProductCategorySelectingArrayController 0x10e8650> for the key
path "model.currentCost" from <Product 0x1a68130>, most likely
because the value for the key "model" has changed without an
appropriate KVO notification being sent. Check the
KVO-compliance of the Product class.
Googling, I found some other developers who have experienced
this but no answers were offered.
Note that the exceptions are complaining about one of the
Model's attributes: currentCost. At other times, the exception
complains about another attribute: 'active' -- its unclear
whether that refers to the Model's 'active' attribute or the
Product's 'active' attribute.
Should I be reporting a bug?
Thanks,
Steve
** this likely has little to do with my question, but for the
curious: I programmatically bind a contentSet based on the
setting of a radio button with two choices: 'All' and "Model".
"All" means show all products, "Model" means show just the
Products for the selected Model. I only have the problem in
"Model" mode.
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