Value must be a pointer when passed
value_to_pointer = Pointer.new(:object)
value_to_pointer.assign(value)
Regards,
- Rob
On 2011-06-28, at 12:08 PM, Eloy Duran <e...@dekleineprins.me> wrote:
I have no experience with Core Data, but if you are looking to make
repetitive work easy then don't forget about the metaprogramming
possibilities with Ruby. Taking your example, you could create class
method like the following:
class Model
def self.core_data_accessor(name)
class_eval(%{
def add#{name}Object(value)
changedObjects = NSSet.setWithObject(value)
willChangeValueForKey('#{name}',
withSetMutation:NSKeyValueUnionSetMutation,
usingObjects:changedObjects)
primitiveValueForKey('#{name}').addObject(value)
didChangeValueForKey('#{name}',
withSetMutation:NSKeyValueUnionSetMutation,
usingObjects:changedObjects)
end
})
end
core_data_accessor 'SubFolders'
core_data_accessor 'OtherFolders'
# etc
end
HTH
On Tue, Jun 28, 2011 at 5:55 PM, Shannon Love <tech...@me.com> wrote:
I'm not to the point of wiring up the UI yet. I will employ
bindings when I
do so but at the moment I am creating a complex data model using
NSManagedObject subclasses with lots of customized behaviors. I do
this all
the time in Objective-c but I am uncertain how to go about doing so
in
MacRuby.
The @dynamic processor in Objective-C 2.0 autogenerates attribute
and
relationship accessors except for the to-many relationship
convenience
methods but obviously MacRuby has no such capability. I don't think
the
`attr_accessor ` in ruby will generate the proper core data
accessors.
I suppose my real question is: Do we have to write all the
accessors like we
used to do in the early days of Core Data in Objective-s 1.0 or is
there
some functionality in ruby or MacRuby that obviates the need to do
so?
Thanks,
Shannon
On Jun 27, 2011, at 5:55 PM, Matt Aimonetti wrote:
Hey Shannon,
I'm not sure I fully understand, but you should be able to just set
the
accessor and do the binding via Xcode as shown
here: http://ofps.oreilly.com/titles/9781449380373/_core_data.html
Let me know if that doesn't answer your question.
- Matt
On Mon, Jun 27, 2011 at 3:45 PM, Shannon Love <tech...@me.com> wrote:
Howdy,
I've Core Data a lot in Objective-c and now I am trying to use it in
MacRuby. It occurs to me that I might need to create the to-many
relationship accessors just like you have to do in Objective-C.
To clarify: Suppose I have a data model that models a file
structure and
which looks like this:
Folder{
name:string
parent<<-->Folder.subFolders
subFolders<-->>Folder.parent
files<-->>File.folder
}
File{
name:string
folder<<-->Folder.file
}
In Objective-C, I would normally have methods in the `Folder`
class that
would look like:
addSubFoldersObject:
removeSubFoldersObject:
addSubFoldersObjects:
removeSubFoldersObjects:
The methods themselves would use look something like:
- (void)addSubFoldersObject:(FetchedPropertyExtractor *)value {
NSSet *changedObjects = [[NSSet alloc] initWithObjects:&value
count:1];
[self willChangeValueForKey:@"SubFolders"
withSetMutation:NSKeyValueUnionSetMutation
usingObjects:changedObjects];
[[self primitiveValueForKey:@"SubFolders"] addObject:value];
[self didChangeValueForKey:@"SubFolders"
withSetMutation:NSKeyValueUnionSetMutation
usingObjects:changedObjects];
[changedObjects release];
}
Do you have to do the same thing in MacRuby or will the normal
ruby set
operations suffice?
Thanks,
Shannon Love a.k.a TechZen
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