mirror of
https://github.com/zhigang1992/RestKit.git
synced 2026-04-02 17:57:22 +08:00
45 lines
1.7 KiB
Objective-C
45 lines
1.7 KiB
Objective-C
//
|
|
// RKFetchRequestMappingCache.m
|
|
// RestKit
|
|
//
|
|
// Created by Jeff Arena on 1/24/12.
|
|
// Copyright (c) 2009-2012 RestKit. All rights reserved.
|
|
//
|
|
|
|
#import "RKFetchRequestManagedObjectCache.h"
|
|
#import "NSManagedObject+ActiveRecord.h"
|
|
#import "NSEntityDescription+RKAdditions.h"
|
|
#import "RKLog.h"
|
|
|
|
// Set Logging Component
|
|
#undef RKLogComponent
|
|
#define RKLogComponent lcl_cRestKitCoreData
|
|
|
|
@implementation RKFetchRequestManagedObjectCache
|
|
|
|
- (NSManagedObject *)findInstanceOfEntity:(NSEntityDescription *)entity
|
|
withPrimaryKeyAttribute:(NSString *)primaryKeyAttribute
|
|
value:(id)primaryKeyValue
|
|
inManagedObjectContext:(NSManagedObjectContext *)managedObjectContext
|
|
{
|
|
NSAssert(entity, @"Cannot find existing managed object without a target class");
|
|
NSAssert(primaryKeyAttribute, @"Cannot find existing managed object instance without mapping that defines a primaryKeyAttribute");
|
|
NSAssert(primaryKeyValue, @"Cannot find existing managed object by primary key without a value");
|
|
NSAssert(managedObjectContext, @"Cannot find existing managed object with a context");
|
|
|
|
NSFetchRequest* fetchRequest = [[NSFetchRequest alloc] init];
|
|
[fetchRequest setEntity:entity];
|
|
[fetchRequest setFetchLimit:1];
|
|
[fetchRequest setPredicate:[NSPredicate predicateWithFormat:@"%K = %@", primaryKeyAttribute, primaryKeyValue]];
|
|
NSArray *objects = [NSManagedObject executeFetchRequest:fetchRequest];
|
|
RKLogDebug(@"Found objects '%@' using fetchRequest '%@'", objects, fetchRequest);
|
|
|
|
NSManagedObject *object = nil;
|
|
if ([objects count] > 0) {
|
|
object = [objects objectAtIndex:0];
|
|
}
|
|
return object;
|
|
}
|
|
|
|
@end
|