ios5 - RestKit loadObjectsAtResourcePath: delegate funciona una vez, pero nunca más

xcode4

Question

Soy bastante nuevo en Objective-C y XCode, pero aún más nuevo en RestKit, aunque he estado programando en Java durante 12 años.

Tengo una aplicación IOS conectada a RestKit y una acción para cargar desde un servidor de reposo funciona solo la primera vez, si vuelvo al controlador de navegación y vuelvo a intentar la misma operación, se llama al método loadObjectsAtResourcePath:delegate , pero ninguno de los los métodos de delegado alguna vez se llaman (e implementé todos ellos solo para iniciar sesión cuando ocurren).

Siento que me he perdido algo fundamental con Restkit, y tal vez la naturaleza asincrónica, porque el mapeo claramente funciona bien la primera vez, por lo que la llamada subsiguiente debe perderse en una cola asincrónica.

He buscado en Google esto, y he visto a gente similar atascarse con algo similar, pero los intenté todos y no parece marcar la diferencia. El almacenamiento en caché está deshabilitado, el objectLoaderDidLoadUnexpectedResponse y didFailWithError nunca reciben llamadas, se está cayendo al suelo.

Fuente del código:

Mi proyecto XCode está en github aquí

El controlador de vista específico que realiza la llamada de carga está aquí (consulte el método setUpRestKit)

La secuencia de llamadas es la siguiente:

• El usuario completa el nombre de host y el puerto, y los clics se conectan
• ESRKConnectionViewController.m recibe la llamada a través de prepareForSegue y configura el RKClient compartido con esta dirección (aunque descubro más tarde que RKClient no se usa mucho, RKOBjectManager parece tomar solo un URL base, por lo que es redundante)
• ESRKServerViewController.m luego establece la asignación en RKObjectManager e invoca loadObjectsAtResourcePath pasándose a sí mismo como un delegado (sí, me doy cuenta de que probablemente estas asignaciones deberían configurarse al inicio en el delegado de la aplicación, pero no veo cómo configurar esto de nuevo es algo más que solo código redundante)
• El ObjectLoader: didLoadObjects callback está a cargo de tomar el objeto mapeado y configurar el modelo para la vista de tabla, esto se dispara solo una vez.

Habilitando los registros, este es el patrón que veo, con anotaciones cuando se completa la primera llamada, y cuando el segundo comienza, etc. (las marcas de tiempo recortadas para mayor claridad aquí):

ElasticSearchHeadIOS[25064:fb03] I restkit:RKLog.m:32 RestKit initialized...
ElasticSearchHeadIOS[25064:fb03] I restkit.support:RKCache.m:178 Invalidating cache at path: /Users/paulsmith/Library/Application Support/iPhone Simulator/5.1/Applications/BDB8B59F-8307-4F18-A4E7-C55849618D77/Library/Caches/RKClientRequestCache-localhost/SessionStore
ElasticSearchHeadIOS[25064:fb03] I restkit.network.reachability:RKReachabilityObserver.m:155 Reachability observer initialized with hostname localhost
ElasticSearchHeadIOS[25064:fb03] D restkit.network:RKClient.m:271 Reachability observer changed for client <RKClient: 0x80756e0>, suspending queue <RKRequestQueue: 0x8082600 name=(null) suspended=YES requestCount=0 loadingCount=0/5> until reachability to host ''localhost'' can be determined
ElasticSearchHeadIOS[25064:fb03] Connecting to http://localhost:9200/ -- http://localhost:9200/ -- http://localhost:9200/
ElasticSearchHeadIOS[25064:fb03] I restkit.support:RKCache.m:178 Invalidating cache at path: /Users/paulsmith/Library/Application Support/iPhone Simulator/5.1/Applications/BDB8B59F-8307-4F18-A4E7-C55849618D77/Library/Caches/RKClientRequestCache-localhost/SessionStore
ElasticSearchHeadIOS[25064:fb03] I restkit.network.reachability:RKReachabilityObserver.m:155 Reachability observer initialized with hostname localhost
ElasticSearchHeadIOS[25064:fb03] D restkit.network:RKClient.m:271 Reachability observer changed for client <RKClient: 0x8087840>, suspending queue <RKRequestQueue: 0x8087a40 name=(null) suspended=YES requestCount=0 loadingCount=0/5> until reachability to host ''localhost'' can be determined
ElasticSearchHeadIOS[25064:fb03] I restkit.network.reachability:RKReachabilityObserver.m:369 Network availability has been determined for reachability observer <RKReachabilityObserver: 0x8088980 host=localhost isReachabilityDetermined=YES isMonitoringLocalWiFi=1039984 reachabilityFlags=-R -----ld>
ElasticSearchHeadIOS[25064:fb03] D restkit.network:RKClient.m:401 Reachability to host ''localhost'' determined for client <RKClient: 0x8087840>, unsuspending queue <RKRequestQueue: 0x8087a40 name=(null) suspended=YES requestCount=1 loadingCount=0/5>
ElasticSearchHeadIOS[25064:fb03] D restkit.network:RKRequest.m:435 Sending asynchronous GET request to URL http://localhost:9200/_cluster/state.
ElasticSearchHeadIOS[25064:fb03] T restkit.network:RKRequest.m:381 Prepared GET URLRequest ''<NSMutableURLRequest http://localhost:9200/_cluster/state>''. HTTP Headers: {
    Accept = "application/json";
    "Content-Length" = 0;
}. HTTP Body: .
ElasticSearchHeadIOS[25064:fb03] I restkit.network.reachability:RKReachabilityObserver.m:369 Network availability has been determined for reachability observer <RKReachabilityObserver: 0x6c5c530 host=localhost isReachabilityDetermined=YES isMonitoringLocalWiFi=1039984 reachabilityFlags=-R -----ld>
ElasticSearchHeadIOS[25064:fb03] D restkit.network:RKClient.m:401 Reachability to host ''localhost'' determined for client <RKClient: 0x80756e0>, unsuspending queue <RKRequestQueue: 0x8082600 name=(null) suspended=YES requestCount=0 loadingCount=0/5>
ElasticSearchHeadIOS[25064:fb03] D restkit.network:RKResponse.m:195 NSHTTPURLResponse Status Code: 200
ElasticSearchHeadIOS[25064:fb03] D restkit.network:RKResponse.m:196 Headers: {
    "Content-Length" = 4462;
    "Content-Type" = "application/json; charset=UTF-8";
}
 ElasticSearchHeadIOS[25064:fb03] T restkit.network:RKResponse.m:203 Read response body: {"cluster_name":"paul","master_node":"FGewvE3-TEKjXugOGJpWmQ","blocks":{},"nodes":{"FGewvE3-TEKjXugOGJpWmQ":{"name":"Namor the Sub-Mariner","transport_address":"inet[/192.168.0.12:9300]","attributes":{}}},"metadata":{"templates":{},"indices":{"melpaul":{"state":"open","settings":{"index.number_of_replicas":"1","index.number_of_shards":"5","index.version.created":"190299"},"mappings":{"project":{"properties":{"projectAddress":{"type":"string"},"id":{"type":"string"},"suburb":{"type":"string"},"name":{"type":"string"},"state":{"type":"string"},"postalAddress":{"type":"string"},"ownerOrganizationID":{"type":"long"},"shortName":{"type":"string"},"deliveryAddress":{"type":"string"},"country":{"type":"string"}}},"organization":{"properties":{"id":{"type":"string"},"tradingName":{"type":"string"},"name":{"type":"string"},"extParticipant":{"type":"string"},"code":{"type":"string"}}},"task":{"properties":{"aggregateCount":{"type":"long"},"dueDateIso":{"type":"string"},"assignedByUser":{"type":"string"},"pertinent":{"type":"boolean"},"assignedByUserId":{"type":"long"},"assignedBy":{"type":"string"},"projectId":{"type":"long"},"type":{"type":"string"},"id":{"type":"string"},"creationDate":{"type":"long"},"assignedToUserId":{"type":"long"},"description":{"type":"string"},"featureId":{"type":"string"},"aggregated":{"type":"boolean"},"assignedToUser":{"type":"string"},"projectName":{"type":"string"},"dueDate":{"type":"long"},"referenceLabel":{"type":"string"}}},"user":{"properties":{"sortlastName":{"type":"string"},"position":{"type":"string"},"lastName":{"type":"string"},"phone":{"type":"string"},"accessEnabled":{"type":"string"},"orgName":{"type":"string"},"directoryVisibility":{"type":"string"},"id":{"type":"string"},"orgId":{"type":"string"},"orgTradingName":{"type":"string"},"title":{"type":"string"},"divisionName":{"type":"string"},"email":{"type":"string"},"sortfirstName":{"type":"string"},"userName":{"type":"string"},"extParticipant":{"type":"string"},"firstName":{"type":"string"},"accountUnlocked":{"type":"string"},"mobile":{"type":"string"}}}},"aliases":[]}}},"routing_table":{"indices":{"melpaul":{"shards":{"0":[{"state":"STARTED","primary":true,"node":"FGewvE3-TEKjXugOGJpWmQ","relocating_node":null,"shard":0,"index":"melpaul"},{"state":"UNASSIGNED","primary":false,"node":null,"relocating_node":null,"shard":0,"index":"melpaul"}],"1":[{"state":"STARTED","primary":true,"node":"FGewvE3-TEKjXugOGJpWmQ","relocating_node":null,"shard":1,"index":"melpaul"},{"state":"UNASSIGNED","primary":false,"node":null,"relocating_node":null,"shard":1,"index":"melpaul"}],"2":[{"state":"STARTED","primary":true,"node":"FGewvE3-TEKjXugOGJpWmQ","relocating_node":null,"shard":2,"index":"melpaul"},{"state":"UNASSIGNED","primary":false,"node":null,"relocating_node":null,"shard":2,"index":"melpaul"}],"3":[{"state":"STARTED","primary":true,"node":"FGewvE3-TEKjXugOGJpWmQ","relocating_node":null,"shard":3,"index":"melpaul"},{"state":"UNASSIGNED","primary":false,"node":null,"relocating_node":null,"shard":3,"index":"melpaul"}],"4":[{"state":"STARTED","primary":true,"node":"FGewvE3-TEKjXugOGJpWmQ","relocating_node":null,"shard":4,"index":"melpaul"},{"state":"UNASSIGNED","primary":false,"node":null,"relocating_node":null,"shard":4,"index":"melpaul"}]}}}},"routing_nodes":{"unassigned":[{"state":"UNASSIGNED","primary":false,"node":null,"relocating_node":null,"shard":0,"index":"melpaul"},{"state":"UNASSIGNED","primary":false,"node":null,"relocating_node":null,"shard":1,"index":"melpaul"},{"state":"UNASSIGNED","primary":false,"node":null,"relocating_node":null,"shard":2,"index":"melpaul"},{"state":"UNASSIGNED","primary":false,"node":null,"relocating_node":null,"shard":3,"index":"melpaul"},{"state":"UNASSIGNED","primary":false,"node":null,"relocating_node":null,"shard":4,"index":"melpaul"}],"nodes":{"FGewvE3-TEKjXugOGJpWmQ":[{"state":"STARTED","primary":true,"node":"FGewvE3-TEKjXugOGJpWmQ","relocating_node":null,"shard":0,"index":"melpaul"},{"state":"STARTED","primary":true,"node":"FGewvE3-TEKjXugOGJpWmQ","relocating_node":null,"shard":1,"index":"melpaul"},{"state":"STARTED","primary":true,"node":"FGewvE3-TEKjXugOGJpWmQ","relocating_node":null,"shard":2,"index":"melpaul"},{"state":"STARTED","primary":true,"node":"FGewvE3-TEKjXugOGJpWmQ","relocating_node":null,"shard":3,"index":"melpaul"},{"state":"STARTED","primary":true,"node":"FGewvE3-TEKjXugOGJpWmQ","relocating_node":null,"shard":4,"index":"melpaul"}]}},"allocations":[]}
 ElasticSearchHeadIOS[25064:1400b] D restkit.network:RKObjectLoader.m:262 Beginning object mapping activities within GCD queue labeled: org.restkit.ObjectMapping
 ElasticSearchHeadIOS[25064:1400b] D restkit.network:RKObjectLoader.m:250 No object mapping provider, using mapping provider from parent object manager to perform KVC mapping
 ElasticSearchHeadIOS[25064:1400b] T restkit.network:RKObjectLoader.m:187 bodyAsString: {"cluster_name":"paul","master_node":"FGewvE3-TEKjXugOGJpWmQ","blocks":{},"nodes":{"FGewvE3-TEKjXugOGJpWmQ":{"name":"Namor the Sub-Mariner","transport_address":"inet[/192.168.0.12:9300]","attributes":{}}},"metadata":{"templates":{},"indices":{"melpaul":{"state":"open","settings":{"index.number_of_replicas":"1","index.number_of_shards":"5","index.version.created":"190299"},"mappings":{"project":{"properties":{"projectAddress":{"type":"string"},"id":{"type":"string"},"suburb":{"type":"string"},"name":{"type":"string"},"state":{"type":"string"},"postalAddress":{"type":"string"},"ownerOrganizationID":{"type":"long"},"shortName":{"type":"string"},"deliveryAddress":{"type":"string"},"country":{"type":"string"}}},"organization":{"properties":{"id":{"type":"string"},"tradingName":{"type":"string"},"name":{"type":"string"},"extParticipant":{"type":"string"},"code":{"type":"string"}}},"task":{"properties":{"aggregateCount":{"type":"long"},"dueDateIso":{"type":"string"},"assignedByUser":{"type":"string"},"pertinent":{"type":"boolean"},"assignedByUserId":{"type":"long"},"assignedBy":{"type":"string"},"projectId":{"type":"long"},"type":{"type":"string"},"id":{"type":"string"},"creationDate":{"type":"long"},"assignedToUserId":{"type":"long"},"description":{"type":"string"},"featureId":{"type":"string"},"aggregated":{"type":"boolean"},"assignedToUser":{"type":"string"},"projectName":{"type":"string"},"dueDate":{"type":"long"},"referenceLabel":{"type":"string"}}},"user":{"properties":{"sortlastName":{"type":"string"},"position":{"type":"string"},"lastName":{"type":"string"},"phone":{"type":"string"},"accessEnabled":{"type":"string"},"orgName":{"type":"string"},"directoryVisibility":{"type":"string"},"id":{"type":"string"},"orgId":{"type":"string"},"orgTradingName":{"type":"string"},"title":{"type":"string"},"divisionName":{"type":"string"},"email":{"type":"string"},"sortfirstName":{"type":"string"},"userName":{"type":"string"},"extParticipant":{"type":"string"},"firstName":{"type":"string"},"accountUnlocked":{"type":"string"},"mobile":{"type":"string"}}}},"aliases":[]}}},"routing_table":{"indices":{"melpaul":{"shards":{"0":[{"state":"STARTED","primary":true,"node":"FGewvE3-TEKjXugOGJpWmQ","relocating_node":null,"shard":0,"index":"melpaul"},{"state":"UNASSIGNED","primary":false,"node":null,"relocating_node":null,"shard":0,"index":"melpaul"}],"1":[{"state":"STARTED","primary":true,"node":"FGewvE3-TEKjXugOGJpWmQ","relocating_node":null,"shard":1,"index":"melpaul"},{"state":"UNASSIGNED","primary":false,"node":null,"relocating_node":null,"shard":1,"index":"melpaul"}],"2":[{"state":"STARTED","primary":true,"node":"FGewvE3-TEKjXugOGJpWmQ","relocating_node":null,"shard":2,"index":"melpaul"},{"state":"UNASSIGNED","primary":false,"node":null,"relocating_node":null,"shard":2,"index":"melpaul"}],"3":[{"state":"STARTED","primary":true,"node":"FGewvE3-TEKjXugOGJpWmQ","relocating_node":null,"shard":3,"index":"melpaul"},{"state":"UNASSIGNED","primary":false,"node":null,"relocating_node":null,"shard":3,"index":"melpaul"}],"4":[{"state":"STARTED","primary":true,"node":"FGewvE3-TEKjXugOGJpWmQ","relocating_node":null,"shard":4,"index":"melpaul"},{"state":"UNASSIGNED","primary":false,"node":null,"relocating_node":null,"shard":4,"index":"melpaul"}]}}}},"routing_nodes":{"unassigned":[{"state":"UNASSIGNED","primary":false,"node":null,"relocating_node":null,"shard":0,"index":"melpaul"},{"state":"UNASSIGNED","primary":false,"node":null,"relocating_node":null,"shard":1,"index":"melpaul"},{"state":"UNASSIGNED","primary":false,"node":null,"relocating_node":null,"shard":2,"index":"melpaul"},{"state":"UNASSIGNED","primary":false,"node":null,"relocating_node":null,"shard":3,"index":"melpaul"},{"state":"UNASSIGNED","primary":false,"node":null,"relocating_node":null,"shard":4,"index":"melpaul"}],"nodes":{"FGewvE3-TEKjXugOGJpWmQ":[{"state":"STARTED","primary":true,"node":"FGewvE3-TEKjXugOGJpWmQ","relocating_node":null,"shard":0,"index":"melpaul"},{"state":"STARTED","primary":true,"node":"FGewvE3-TEKjXugOGJpWmQ","relocating_node":null,"shard":1,"index":"melpaul"},{"state":"STARTED","primary":true,"node":"FGewvE3-TEKjXugOGJpWmQ","relocating_node":null,"shard":2,"index":"melpaul"},{"state":"STARTED","primary":true,"node":"FGewvE3-TEKjXugOGJpWmQ","relocating_node":null,"shard":3,"index":"melpaul"},{"state":"STARTED","primary":true,"node":"FGewvE3-TEKjXugOGJpWmQ","relocating_node":null,"shard":4,"index":"melpaul"}]}},"allocations":[]}
 ElasticSearchHeadIOS[25064:1400b]  willMapData
 ElasticSearchHeadIOS[25064:fb03] did finish loading

Ok, la vista de tabla que muestra los datos mapeados que han regresado de las llamadas anteriores ahora está hecha, y puedo ver los resultados correctamente en la pantalla.

Hago clic atrás en el controlador de navegación, intento la misma solicitud nuevamente, y esto es lo que hacen los registros. Los registros aquí comienzan justo después de que haga clic en el botón de conexión y comiencen las mismas llamadas que arriba (no hay otros registros entre el bloque anterior y el siguiente).

I restkit.support:RKCache.m:178 Invalidating cache at path: /Users/paulsmith/Library/Application Support/iPhone Simulator/5.1/Applications/BDB8B59F-8307-4F18-A4E7-C55849618D77/Library/Caches/RKClientRequestCache-localhost/SessionStore
I restkit.network.reachability:RKReachabilityObserver.m:155 Reachability observer initialized with hostname localhost
D restkit.network:RKClient.m:271 Reachability observer changed for client <RKClient: 0x808ce90>, suspending queue <RKRequestQueue: 0x80834c0 name=(null) suspended=YES requestCount=0 loadingCount=0/5> until reachability to host ''localhost'' can be determined
D restkit.network:RKClient.m:256 Reachability observer changed for RKClient <RKClient: 0x80756e0>, disposing of previous instance: <RKReachabilityObserver: 0x6c5c530 host=localhost isReachabilityDetermined=YES isMonitoringLocalWiFi=1039984 reachabilityFlags=-R -----ld>
Connecting to http://localhost:9200/ -- http://localhost:9200/ -- http://localhost:9200/
I restkit.support:RKCache.m:178 Invalidating cache at path: /Users/paulsmith/Library/Application Support/iPhone Simulator/5.1/Applications/BDB8B59F-8307-4F18-A4E7-C55849618D77/Library/Caches/RKClientRequestCache-localhost/SessionStore
I restkit.network.reachability:RKReachabilityObserver.m:155 Reachability observer initialized with hostname localhost
D restkit.network:RKClient.m:271 Reachability observer changed for client <RKClient: 0x81b0bc0>, suspending queue <RKRequestQueue: 0x81b0d20 name=(null) suspended=YES requestCount=0 loadingCount=0/5> until reachability to host ''localhost'' can be determined
D restkit.network:RKClient.m:256 Reachability observer changed for RKClient <RKClient: 0x81b0bc0>, disposing of previous instance: <RKReachabilityObserver: 0x81b1c80 host=localhost isReachabilityDetermined=NO isMonitoringLocalWiFi=1039984 reachabilityFlags=-- ------->
I restkit.network.reachability:RKReachabilityObserver.m:369 Network availability has been determined for reachability observer <RKReachabilityObserver: 0x807f2f0 host=localhost isReachabilityDetermined=YES isMonitoringLocalWiFi=1039984 reachabilityFlags=-R -----ld>
D restkit.network:RKClient.m:401 Reachability to host ''localhost'' determined for client <RKClient: 0x808ce90>, unsuspending queue <RKRequestQueue: 0x80834c0 name=(null) suspended=YES requestCount=0 loadingCount=0/5>

Aquí hay un screencast de Jing de cómo se ve en el simulador (se pueden ver los puntos de quiebre de los métodos de delegado que se llamaron la primera vez, pero luego nada el segundo)

Answer 1

Este es un problema de retención. Está creando una copia local de un objeto y no lo asigna a nada que haga que se conserve. Esto es probablemente RKObjectManager o similar. Cree una propiedad como myObjectManager y asígnela como self.myObjectManager = [[RkObjectManager alloc] init];

Asegúrese de estudiar y comprender la gestión de la memoria. ¡Usa ARC, pero aún necesitarás una comprensión básica de la administración de la memoria!

HTH

Answer 2

También encuentro este método en la documentación: loadObjectsAtResourcePath: usingBlock: pero no puedo usarlo porque me dice: No se indica ninguna interfaz @ visible para ''RKObjectManager'' ... Si intentas segmentar Core Data, entonces querrás para usar RKManagedObjectRequestOperation y managedObjectRequestOperationWithRequest: success: failure:. Hay ejemplos adicionales disponibles en ... Restkit Post No envía Object · 1 · PUT request, cambia los encabezados y guarda ...