[MacRuby-devel] Need to Write Core Data Accessors in MacRuby?

[Eloy Duran]

Oops, thanks for the fix :)

On 28 jun 2011, at 18:21, Robert Lowe wrote:

> 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 <eloy at 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 <techzen at 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 <techzen at 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
>>>> 
>>>> 
>>>> 
>>>> _______________________________________________
>>>> MacRuby-devel mailing list
>>>> MacRuby-devel at lists.macosforge.org
>>>> http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
>>>> 
>>> 
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>>> 
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>>> 
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