如何讓RLMObjects的數組成爲Realm類的屬性？

Question

我正在嘗試將單詞與句子對象相關聯，並使句子由單詞對象組成。

這就是我想做的事：

class Word: RLMObject { 
    dynamic var sentences = [Sentence] 
    dynamic var spanish = "" 
    dynamic var english = "" 
} 

class Sentence: RLMObject { 
    dynamic var content = [Word] 
    dynamic var machineTranslation = "" 
} 

word1 = Word.objectsWhere("spanish == 'hola'").firstObject() 
word2 = Word.objectsWhere("spanish == 'amigo'").firstObject() 

let sentence1 = [word1,word2] 

var Realm = RLMRealm.defaultRealm() 
Realm.beginWriteTransaction() 
Realm.addObject(sentence1) 
Realm.commitWriteTransaction() 

我得到這個在我的調試控制檯：

2014-12-03 12:42:36.139 MyApp [5743:586150] *** Terminating app due to uncaught exception 'RLMException', reason: ''(null)' is not supported as an RLMObject property. All properties must be primitives, NSString, NSDate, NSData, RLMArray, or subclasses of RLMObject. See http://realm.io/docs/cocoa/api/Classes/RLMObject.html for more information.' 
*** First throw call stack: 
(
    0 CoreFoundation      0x0000000105c72f35 __exceptionPreprocess + 165 
    1 libobjc.A.dylib      0x00000001077f2bb7 objc_exception_throw + 45 
    2 MyApp        0x000000010578bd0f -[RLMProperty setTypeFromRawType] + 1155 
    3 MyApp        0x000000010578c108 -[RLMProperty initSwiftPropertyWithName:attributes:property:instance:] + 391 
    4 MyApp        0x0000000105785a6d +[RLMObjectSchema propertiesForClass:] + 412 
    5 MyApp        0x0000000105785341 +[RLMObjectSchema schemaForObjectClass:createAccessors:] + 318 
    6 MyApp        0x00000001057abdfc __23+[RLMSchema initialize]_block_invoke + 769 
    7 libdispatch.dylib     0x0000000107f977f4 _dispatch_client_callout + 8 
    8 libdispatch.dylib     0x0000000107f84343 dispatch_once_f + 565 
    9 libobjc.A.dylib      0x00000001077f34d6 _class_initialize + 648 
    10 libobjc.A.dylib      0x00000001077fc6e1 lookUpImpOrForward + 351 
    11 libobjc.A.dylib      0x00000001078090d3 objc_msgSend + 211 
    12 MyApp        0x0000000105782826 -[RLMObject init] + 38 
    13 MyApp        0x000000010577011b _TFC11MyApp  4WordcfMS0_FT_GSQS0__ + 315 
    14 MyApp        0x0000000105770292 _TFC11MyApp  4WordCfMS0_FT_GSQS0__ + 50 
    15 MyApp        0x000000010576a894 _TFC11MyApp  11AppDelegate11applicationfS0_FTCSo13UIApplication29didFinishLaunchingWithOptionsGSqGVSs10DictionaryCSo8NSObjectPSs9AnyObject____Sb + 340 
    16 MyApp        0x000000010576b660 _TToFC11MyApp  11AppDelegate11applicationfS0_FTCSo13UIApplication29didFinishLaunchingWithOptionsGSqGVSs10DictionaryCSo8NSObjectPSs9AnyObject____Sb + 560 
    17 UIKit        0x00000001064f9475 -[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] + 234 
    18 UIKit        0x00000001064f9fbc -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 2463 
    19 UIKit        0x00000001064fcd2c -[UIApplication _runWithMainScene:transitionContext:completion:] + 1350 
    20 UIKit        0x00000001064fbbf2 -[UIApplication workspaceDidEndTransaction:] + 179 
    21 FrontBoardServices     0x00000001092822a3 __31-[FBSSerialQueue performAsync:]_block_invoke + 16 
    22 CoreFoundation      0x0000000105ba853c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12 
    23 CoreFoundation      0x0000000105b9e285 __CFRunLoopDoBlocks + 341 
    24 CoreFoundation      0x0000000105b9da43 __CFRunLoopRun + 851 
    25 CoreFoundation      0x0000000105b9d486 CFRunLoopRunSpecific + 470 
    26 UIKit        0x00000001064fb669 -[UIApplication _run] + 413 
    27 UIKit        0x00000001064fe420 UIApplicationMain + 1282 
    28 MyApp        0x000000010576bb9e top_level_code + 78 
    29 MyApp        0x000000010576bbda main + 42 
    30 libdyld.dylib      0x0000000107fcc145 start + 1 
    31 ???         0x0000000000000001 0x0 + 1 
) 
libc++abi.dylib: terminating with uncaught exception of type NSException 
(lldb) 

我應該努力使這種關係的工作在我的代碼？

Answer 1

正如Swift中的Realm's docs on relationships所述，只需聲明您的對多個屬性爲RLMArray即可。以下是你的模型應該看起來如何：

class Word: RLMObject { 
    dynamic var sentences = RLMArray(objectClassName: Sentence.className()) 
    dynamic var spanish = "" 
    dynamic var english = "" 
} 

class Sentence: RLMObject { 
    dynamic var content = RLMArray(objectClassName: Word.className()) 
    dynamic var machineTranslation = "" 
}