我正在使用 RestKit 0.20。我正在尝试从本地 rails 应用程序下载 json 响应并将其保存到 core-data。我尝试关注https://github.com/RestKit/RKGist/blob/master/TUTORIAL.md，一切正常。
我想多次使用它，所以我将它设为基类（ListController）并将其子类化为 SessionListController 和 EventListController。映射在 AppDelegate.m 中提供。
该应用程序具有第一个视图控制器，它是始终映射响应的根控制器，并且一切正常。但是一旦我更改视图控制器，我就会得到响应并且操作停止。它甚至没有说映射是否已经开始。我不确定我错过了什么。
在这里我正在初始化restkit
AppDelegate.m
#import "AppDelegate.h"
#import <UIKit/UIKit.h>
@implementation AppDelegate
RKEntityMapping *eventEntityMapping,*sessionEntitiyMapping;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
NSError *error = nil;
NSURL *modelURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"event" ofType:@"momd"]];
NSManagedObjectModel *managedObjectModel = [[[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL] mutableCopy];
[self setManagedObjectStore: [[RKManagedObjectStore alloc] initWithManagedObjectModel:managedObjectModel]];
// Initialize the Core Data stack
[self.managedObjectStore createPersistentStoreCoordinator];
NSPersistentStore __unused *persistentStore = [self.managedObjectStore addInMemoryPersistentStore:&error];
NSAssert(persistentStore, @"Failed to add persistent store: %@", error);
[self.managedObjectStore createManagedObjectContexts];
// Set the default store shared instance
[RKManagedObjectStore setDefaultStore:self.managedObjectStore];
NSString *url=@"http://192.168.11.11:3000";
RKObjectManager *objectManager = [RKObjectManager managerWithBaseURL:[NSURL URLWithString:url]];
objectManager.managedObjectStore = self.managedObjectStore;
[RKObjectManager setSharedManager:objectManager];
[self mapEntities];
RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:eventEntityMapping pathPattern:@"/api/v1/events" keyPath:nil statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[objectManager addResponseDescriptor:responseDescriptor];
RKResponseDescriptor *responseDescriptor2 = [RKResponseDescriptor responseDescriptorWithMapping:sessionEntitiyMapping pathPattern:@"/api/v1/sessions" keyPath:nil statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[objectManager addResponseDescriptor:responseDescriptor2];
// Override point for customization after application launch.
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard_iPhone" bundle:nil];
UINavigationController *navigationController = [storyboard instantiateViewControllerWithIdentifier:@"mainCenterController"];
IIViewDeckController* secondDeckController = [[IIViewDeckController alloc] initWithCenterViewController:navigationController
leftViewController:[storyboard instantiateViewControllerWithIdentifier:@"sideBarController"]];
secondDeckController.centerhiddenInteractivity=IIViewDeckCenterHiddenNotUserInteractiveWithTapToClose;
self.window.rootViewController = secondDeckController;
return YES;
}
-(void)mapEntities{
//event
eventEntityMapping = [RKEntityMapping mappingForEntityForName:@"Event" inManagedObjectStore:self.managedObjectStore];
[eventEntityMapping addAttributeMappingsFromDictionary:@{
@"id": @"event_id",
@"name": @"name",
@"description": @"desc",
@"no_of_days": @"no_of_days",
@"start_date": @"start_date",
}];
eventEntityMapping.identificationAttributes = @[ @"event_id" ];
sessionEntitiyMapping = [RKEntityMapping mappingForEntityForName:@"Session" inManagedObjectStore:self.managedObjectStore];
[sessionEntitiyMapping addAttributeMappingsFromDictionary:@{
@"name": @"name",
@"description": @"desc",
@"start_time": @"start_time",
@"duration": @"duration",
@"location_id": @"location_id",
@"event_id": @"event_id",
@"id": @"session_id",
}];
sessionEntitiyMapping.identificationAttributes = @[ @"session_id" ];
}
我根据基类为 RKManager 调用 getObjectsAtPath 的基类。
列表控制器.m
@implementation ListController
- (void)viewDidLoad
{
[super viewDidLoad];
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
self.managedObjectContext = appDelegate.managedObjectStore.mainQueueManagedObjectContext;
[self loadLocs];
[self.refreshControl beginRefreshing];
}
-(void)setModel:(Models)model{
if(self.model!=model){
_model=model;
self.title=[Model displayFor:self.model];
_fetchedResultsController = nil;
[self.tableView reloadData];
[self loadLocs];
[self.refreshControl beginRefreshing];
}
}
- (void)loadLocs
{
[[RKObjectManager sharedManager] getObjectsAtPath:[Model listApiFor:self.model]
parameters:nil
success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
[self.refreshControl endRefreshing];
}
failure:^(RKObjectRequestOperation *operation, NSError *error) {
[self.refreshControl endRefreshing];
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"An Error Has Occurred" message:[error localizedDescription] delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
NSLog(@"error: %@",error);
[alertView show];
}];
}
#pragma mark - Table View
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return [[[self fetchedRCforTableView:tableView] sections] count];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
id <NSFetchedResultsSectionInfo> sectionInfo = [self.fetchedResultsController sections][section];
return [sectionInfo numberOfObjects];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
[self configureCell:cell atIndexPath:indexPath forTableView:tableView];
return cell;
}
#pragma mark - Fetched results controller
- (NSFetchedResultsController *)fetchedResultsController
{
if (_fetchedResultsController != nil) {
return _fetchedResultsController;
}
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
// Edit the entity name as appropriate.
NSEntityDescription *entity = [NSEntityDescription entityForName:[Model entityFor:self.model] inManagedObjectContext:self.managedObjectContext];
[fetchRequest setEntity:entity];
// Set the batch size to a suitable number.
[fetchRequest setFetchBatchSize:20];
// Edit the sort key as appropriate.
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:[Model sortDescriptorFor:self.model] ascending:YES];
NSArray *sortDescriptors = @[sortDescriptor];
[fetchRequest setSortDescriptors:sortDescriptors];
NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil cacheName:[Model displayFor:self.model]];
aFetchedResultsController.delegate = self;
self.fetchedResultsController = aFetchedResultsController;
NSError *error = nil;
if (![self.fetchedResultsController performFetch:&error]) {
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort();
}
NSLog(@"_fetchedResultsController count %d",_fetchedResultsController.fetchedObjects.count);
return _fetchedResultsController;
}
@end
这是我设置模型名称的基类之一
事件视图控制器.m
- (void)viewDidLoad
{
[super viewDidLoad];
self.model=Eventm;
// Do any additional setup after loading the view.
}
会话视图控制器.m
- (void)viewDidLoad
{
[super viewDidLoad];
self.model=Sessionm;
// Do any additional setup after loading the view.
}
完整代码在https://github.com/leohemanth/event-app
使用后
RKLogConfigureByName("RestKit", RKLogLevelWarning);
RKLogConfigureByName("RestKit/ObjectMapping", RKLogLevelTrace);
RKLogConfigureByName("RestKit/Network", RKLogLevelTrace);
我可以看到，我得到了正确的 Http 响应，但它没有被映射。我不确定为什么？