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//
// NSManagedObject+ActiveRecord.m
//
// Adapted from https://github.com/magicalpanda/MagicalRecord
// Created by Saul Mora on 11/15/09.
// Copyright 2010 Magical Panda Software, LLC All rights reserved.
//
// Created by Chad Podoski on 3/18/11.
//
#import <objc/runtime.h>
#import "NSManagedObject+ActiveRecord.h"
#import "RKObjectManager.h"
#import "RKLog.h"
#import "RKFixCategoryBug.h"
RK_FIX_CATEGORY_BUG(NSManagedObject_ActiveRecord)
// Set Logging Component
#undef RKLogComponent
#define RKLogComponent lcl_cRestKitCoreData
static NSUInteger const kActiveRecordDefaultBatchSize = 10;
static NSNumber *defaultBatchSize = nil;
@implementation NSManagedObject (ActiveRecord)
#pragma mark - RKManagedObject methods
+ (NSManagedObjectContext*)managedObjectContext {
NSAssert([RKObjectManager sharedManager], @"[RKObjectManager sharedManager] cannot be nil");
NSAssert([RKObjectManager sharedManager].objectStore, @"[RKObjectManager sharedManager].objectStore cannot be nil");
return [[[RKObjectManager sharedManager] objectStore] managedObjectContext];
}
+ (NSEntityDescription*)entity {
NSString* className = [NSString stringWithCString:class_getName([self class]) encoding:NSASCIIStringEncoding];
return [NSEntityDescription entityForName:className inManagedObjectContext:[self managedObjectContext]];
}
+ (NSFetchRequest*)fetchRequest {
NSFetchRequest *fetchRequest = [[[NSFetchRequest alloc] init] autorelease];
NSEntityDescription *entity = [self entity];
[fetchRequest setEntity:entity];
return fetchRequest;
}
+ (NSArray*)objectsWithFetchRequest:(NSFetchRequest*)fetchRequest {
NSError* error = nil;
NSArray* objects = [[self managedObjectContext] executeFetchRequest:fetchRequest error:&error];
if (objects == nil) {
RKLogError(@"Error: %@", [error localizedDescription]);
}
return objects;
}
+ (NSArray*)objectsWithFetchRequests:(NSArray*)fetchRequests {
NSMutableArray* mutableObjectArray = [[NSMutableArray alloc] init];
for (NSFetchRequest* fetchRequest in fetchRequests) {
[mutableObjectArray addObjectsFromArray:[self objectsWithFetchRequest:fetchRequest]];
}
NSArray* objects = [NSArray arrayWithArray:mutableObjectArray];
[mutableObjectArray release];
return objects;
}
+ (id)objectWithFetchRequest:(NSFetchRequest*)fetchRequest {
[fetchRequest setFetchLimit:1];
NSArray* objects = [self objectsWithFetchRequest:fetchRequest];
if ([objects count] == 0) {
return nil;
} else {
return [objects objectAtIndex:0];
}
}
+ (NSArray*)objectsWithPredicate:(NSPredicate*)predicate {
NSFetchRequest* fetchRequest = [self fetchRequest];
[fetchRequest setPredicate:predicate];
return [self objectsWithFetchRequest:fetchRequest];
}
+ (id)objectWithPredicate:(NSPredicate*)predicate {
NSFetchRequest* fetchRequest = [self fetchRequest];
[fetchRequest setPredicate:predicate];
return [self objectWithFetchRequest:fetchRequest];
}
+ (NSArray*)allObjects {
return [self objectsWithPredicate:nil];
}
+ (NSUInteger)count:(NSError**)error {
NSFetchRequest* fetchRequest = [self fetchRequest];
return [[self managedObjectContext] countForFetchRequest:fetchRequest error:error];
}
+ (NSUInteger)count {
NSError *error = nil;
return [self count:&error];
}
+ (id)object {
id object = [[self alloc] initWithEntity:[self entity] insertIntoManagedObjectContext:[self managedObjectContext]];
return [object autorelease];
}
- (BOOL)isNew {
NSDictionary *vals = [self committedValuesForKeys:nil];
return [vals count] == 0;
}
#pragma mark - MagicalRecord Ported Methods
+ (NSManagedObjectContext*)currentContext; {
return [self managedObjectContext];
}
+ (void)setDefaultBatchSize:(NSUInteger)newBatchSize
{
@synchronized(defaultBatchSize)
{
defaultBatchSize = [NSNumber numberWithUnsignedInteger:newBatchSize];
}
}
+ (NSInteger)defaultBatchSize
{
if (defaultBatchSize == nil)
{
[self setDefaultBatchSize:kActiveRecordDefaultBatchSize];
}
return [defaultBatchSize integerValue];
}
+ (void)handleErrors:(NSError *)error
{
if (error)
{
NSDictionary *userInfo = [error userInfo];
for (NSArray *detailedError in [userInfo allValues])
{
if ([detailedError isKindOfClass:[NSArray class]])
{
for (NSError *e in detailedError)
{
if ([e respondsToSelector:@selector(userInfo)])
{
RKLogError(@"Error Details: %@", [e userInfo]);
}
else
{
RKLogError(@"Error Details: %@", e);
}
}
}
else
{
RKLogError(@"Error: %@", detailedError);
}
}
RKLogError(@"Error Domain: %@", [error domain]);
RKLogError(@"Recovery Suggestion: %@", [error localizedRecoverySuggestion]);
}
}
//- (void)handleErrors:(NSError *)error
//{
// [[self class] handleErrors:error];
//}
+ (NSArray *)executeFetchRequest:(NSFetchRequest *)request inContext:(NSManagedObjectContext *)context
{
NSError *error = nil;
NSArray *results = [context executeFetchRequest:request error:&error];
[self handleErrors:error];
return results;
}
+ (NSArray *)executeFetchRequest:(NSFetchRequest *)request
{
return [self executeFetchRequest:request inContext:[self currentContext]];
}
+ (id)executeFetchRequestAndReturnFirstObject:(NSFetchRequest *)request inContext:(NSManagedObjectContext *)context
{
[request setFetchLimit:1];
NSArray *results = [self executeFetchRequest:request inContext:context];
if ([results count] == 0)
{
return nil;
}
return [results objectAtIndex:0];
}
+ (id)executeFetchRequestAndReturnFirstObject:(NSFetchRequest *)request
{
return [self executeFetchRequestAndReturnFirstObject:request inContext:[self currentContext]];
}
#if TARGET_OS_IPHONE
+ (void)performFetch:(NSFetchedResultsController *)controller
{
NSError *error = nil;
if (![controller performFetch:&error])
{
[self handleErrors:error];
}
}
#endif
+ (NSEntityDescription *)entityDescriptionInContext:(NSManagedObjectContext *)context
{
NSString *entityName = NSStringFromClass([self class]);
return [NSEntityDescription entityForName:entityName inManagedObjectContext:context];
}
+ (NSEntityDescription *)entityDescription
{
return [self entityDescriptionInContext:[self currentContext]];
}
+ (NSArray *)propertiesNamed:(NSArray *)properties
{
NSEntityDescription *description = [self entityDescription];
NSMutableArray *propertiesWanted = [NSMutableArray array];
if (properties)
{
NSDictionary *propDict = [description propertiesByName];
for (NSString *propertyName in properties)
{
NSPropertyDescription *property = [propDict objectForKey:propertyName];
if (property)
{
[propertiesWanted addObject:property];
}
else
{
RKLogError(@"Property '%@' not found in %@ properties for %@", propertyName, [propDict count], NSStringFromClass(self));
}
}
}
return propertiesWanted;
}
+ (NSArray *)sortAscending:(BOOL)ascending attributes:(id)attributesToSortBy, ...
{
NSMutableArray *attributes = [NSMutableArray array];
if ([attributesToSortBy isKindOfClass:[NSArray class]])
{
id attributeName;
va_list variadicArguments;
va_start(variadicArguments, attributesToSortBy);
while ((attributeName = va_arg(variadicArguments, id))!= nil)
{
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:attributeName ascending:ascending];
[attributes addObject:sortDescriptor];
[sortDescriptor release];
}
va_end(variadicArguments);
}
else if ([attributesToSortBy isKindOfClass:[NSString class]])
{
va_list variadicArguments;
va_start(variadicArguments, attributesToSortBy);
[attributes addObject:[[[NSSortDescriptor alloc] initWithKey:attributesToSortBy ascending:ascending] autorelease] ];
va_end(variadicArguments);
}
return attributes;
}
+ (NSArray *)ascendingSortDescriptors:(id)attributesToSortBy, ...
{
return [self sortAscending:YES attributes:attributesToSortBy];
}
+ (NSArray *)descendingSortDescriptors:(id)attributesToSortyBy, ...
{
return [self sortAscending:NO attributes:attributesToSortyBy];
}
+ (NSFetchRequest *)createFetchRequestInContext:(NSManagedObjectContext *)context
{
NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease];
[request setEntity:[self entityDescriptionInContext:context]];
return request;
}
+ (NSFetchRequest *)createFetchRequest
{
return [self createFetchRequestInContext:[self currentContext]];
}
#pragma mark -
#pragma mark Number of Entities
+ (NSNumber *)numberOfEntitiesWithContext:(NSManagedObjectContext *)context
{
NSError *error = nil;
NSUInteger count = [context countForFetchRequest:[self createFetchRequestInContext:context] error:&error];
[self handleErrors:error];
return [NSNumber numberWithUnsignedInteger:count];
}
+ (NSNumber *)numberOfEntities
{
return [self numberOfEntitiesWithContext:[self currentContext]];
}
+ (NSNumber *)numberOfEntitiesWithPredicate:(NSPredicate *)searchTerm inContext:(NSManagedObjectContext *)context
{
NSError *error = nil;
NSFetchRequest *request = [self createFetchRequestInContext:context];
[request setPredicate:searchTerm];
NSUInteger count = [context countForFetchRequest:request error:&error];
[self handleErrors:error];
return [NSNumber numberWithUnsignedInteger:count];
}
+ (NSNumber *)numberOfEntitiesWithPredicate:(NSPredicate *)searchTerm;
{
return [self numberOfEntitiesWithPredicate:searchTerm
inContext:[self currentContext]];
}
+ (BOOL)hasAtLeastOneEntityInContext:(NSManagedObjectContext *)context
{
return [[self numberOfEntitiesWithContext:context] intValue] > 0;
}
+ (BOOL)hasAtLeastOneEntity
{
return [self hasAtLeastOneEntityInContext:[self currentContext]];
}
#pragma mark -
#pragma mark Reqest Helpers
+ (NSFetchRequest *)requestAll
{
return [self createFetchRequestInContext:[self currentContext]];
}
+ (NSFetchRequest *)requestAllInContext:(NSManagedObjectContext *)context
{
return [self createFetchRequestInContext:context];
}
+ (NSFetchRequest *)requestAllWhere:(NSString *)property isEqualTo:(id)value inContext:(NSManagedObjectContext *)context
{
NSFetchRequest *request = [self createFetchRequestInContext:context];
[request setPredicate:[NSPredicate predicateWithFormat:@"%K = %@", property, value]];
return request;
}
+ (NSFetchRequest *)requestAllWhere:(NSString *)property isEqualTo:(id)value
{
return [self requestAllWhere:property isEqualTo:value inContext:[self currentContext]];
}
+ (NSFetchRequest *)requestFirstWithPredicate:(NSPredicate *)searchTerm inContext:(NSManagedObjectContext *)context
{
NSFetchRequest *request = [self createFetchRequestInContext:context];
[request setPredicate:searchTerm];
[request setFetchLimit:1];
return request;
}
+ (NSFetchRequest *)requestFirstWithPredicate:(NSPredicate *)searchTerm
{
return [self requestFirstWithPredicate:searchTerm inContext:[self currentContext]];
}
+ (NSFetchRequest *)requestFirstByAttribute:(NSString *)attribute withValue:(id)searchValue inContext:(NSManagedObjectContext *)context;
{
NSFetchRequest *request = [self createFetchRequestInContext:context];
[request setPropertiesToFetch:[self propertiesNamed:[NSArray arrayWithObject:attribute]]];
[request setPredicate:[NSPredicate predicateWithFormat:@"%K = %@", attribute, searchValue]];
return request;
}
+ (NSFetchRequest *)requestFirstByAttribute:(NSString *)attribute withValue:(id)searchValue;
{
return [self requestFirstByAttribute:attribute withValue:searchValue inContext:[self currentContext]];
}
+ (NSFetchRequest *)requestAllSortedBy:(NSString *)sortTerm ascending:(BOOL)ascending inContext:(NSManagedObjectContext *)context
{
NSFetchRequest *request = [self requestAllInContext:context];
NSSortDescriptor *sortBy = [[NSSortDescriptor alloc] initWithKey:sortTerm ascending:ascending];
[request setSortDescriptors:[NSArray arrayWithObject:sortBy]];
[sortBy release];
return request;
}
+ (NSFetchRequest *)requestAllSortedBy:(NSString *)sortTerm ascending:(BOOL)ascending
{
return [self requestAllSortedBy:sortTerm
ascending:ascending
inContext:[self currentContext]];
}
+ (NSFetchRequest *)requestAllSortedBy:(NSString *)sortTerm ascending:(BOOL)ascending withPredicate:(NSPredicate *)searchTerm inContext:(NSManagedObjectContext *)context
{
NSFetchRequest *request = [self requestAllInContext:context];
[request setPredicate:searchTerm];
[request setIncludesSubentities:NO];
[request setFetchBatchSize:[self defaultBatchSize]];
if (sortTerm != nil){
NSSortDescriptor *sortBy = [[NSSortDescriptor alloc] initWithKey:sortTerm ascending:ascending];
[request setSortDescriptors:[NSArray arrayWithObject:sortBy]];
[sortBy release];
}
return request;
}
+ (NSFetchRequest *)requestAllSortedBy:(NSString *)sortTerm ascending:(BOOL)ascending withPredicate:(NSPredicate *)searchTerm;
{
NSFetchRequest *request = [self requestAllSortedBy:sortTerm
ascending:ascending
withPredicate:searchTerm
inContext:[self currentContext]];
return request;
}
#pragma mark Finding Data
#pragma mark -
+ (NSArray *)findAllInContext:(NSManagedObjectContext *)context
{
return [self executeFetchRequest:[self requestAllInContext:context] inContext:context];
}
+ (NSArray *)findAll
{
return [self findAllInContext:[self currentContext]];
}
+ (NSArray *)findAllSortedBy:(NSString *)sortTerm ascending:(BOOL)ascending inContext:(NSManagedObjectContext *)context
{
NSFetchRequest *request = [self requestAllSortedBy:sortTerm ascending:ascending inContext:context];
return [self executeFetchRequest:request inContext:context];
}
+ (NSArray *)findAllSortedBy:(NSString *)sortTerm ascending:(BOOL)ascending
{
return [self findAllSortedBy:sortTerm
ascending:ascending
inContext:[self currentContext]];
}
+ (NSArray *)findAllSortedBy:(NSString *)sortTerm ascending:(BOOL)ascending withPredicate:(NSPredicate *)searchTerm inContext:(NSManagedObjectContext *)context
{
NSFetchRequest *request = [self requestAllSortedBy:sortTerm
ascending:ascending
withPredicate:searchTerm
inContext:context];
return [self executeFetchRequest:request inContext:context];
}
+ (NSArray *)findAllSortedBy:(NSString *)sortTerm ascending:(BOOL)ascending withPredicate:(NSPredicate *)searchTerm
{
return [self findAllSortedBy:sortTerm
ascending:ascending
withPredicate:searchTerm
inContext:[self currentContext]];
}
#pragma mark -
#pragma mark NSFetchedResultsController helpers
#if TARGET_OS_IPHONE
+ (NSFetchedResultsController *)fetchRequestAllGroupedBy:(NSString *)group withPredicate:(NSPredicate *)searchTerm sortedBy:(NSString *)sortTerm ascending:(BOOL)ascending inContext:(NSManagedObjectContext *)context
{
NSString *cacheName = nil;
#ifdef STORE_USE_CACHE
cacheName = [NSString stringWithFormat:@"ActiveRecord-Cache-%@", NSStringFromClass(self)];
#endif
NSFetchRequest *request = [self requestAllSortedBy:sortTerm
ascending:ascending
withPredicate:searchTerm
inContext:context];
NSFetchedResultsController *controller = [[NSFetchedResultsController alloc] initWithFetchRequest:request
managedObjectContext:context
sectionNameKeyPath:group
cacheName:cacheName];
return [controller autorelease];
}
+ (NSFetchedResultsController *)fetchRequestAllGroupedBy:(NSString *)group withPredicate:(NSPredicate *)searchTerm sortedBy:(NSString *)sortTerm ascending:(BOOL)ascending
{
return [self fetchRequestAllGroupedBy:group
withPredicate:searchTerm
sortedBy:sortTerm
ascending:ascending
inContext:[self currentContext]];
}
+ (NSFetchedResultsController *)fetchAllSortedBy:(NSString *)sortTerm ascending:(BOOL)ascending withPredicate:(NSPredicate *)searchTerm groupBy:(NSString *)groupingKeyPath inContext:(NSManagedObjectContext *)context
{
NSFetchedResultsController *controller = [self fetchRequestAllGroupedBy:groupingKeyPath
withPredicate:searchTerm
sortedBy:sortTerm
ascending:ascending
inContext:context];
[self performFetch:controller];
return controller;
}
+ (NSFetchedResultsController *)fetchAllSortedBy:(NSString *)sortTerm ascending:(BOOL)ascending withPredicate:(NSPredicate *)searchTerm groupBy:(NSString *)groupingKeyPath
{
return [self fetchAllSortedBy:sortTerm
ascending:ascending
withPredicate:searchTerm
groupBy:groupingKeyPath
inContext:[self currentContext]];
}
+ (NSFetchedResultsController *)fetchRequest:(NSFetchRequest *)request groupedBy:(NSString *)group inContext:(NSManagedObjectContext *)context
{
NSString *cacheName = nil;
#ifdef STORE_USE_CACHE
cacheName = [NSString stringWithFormat:@"ActiveRecord-Cache-%@", NSStringFromClass([self class])];
#endif
NSFetchedResultsController *controller =
[[NSFetchedResultsController alloc] initWithFetchRequest:request
managedObjectContext:context
sectionNameKeyPath:group
cacheName:cacheName];
[self performFetch:controller];
return [controller autorelease];
}
+ (NSFetchedResultsController *)fetchRequest:(NSFetchRequest *)request groupedBy:(NSString *)group
{
return [self fetchRequest:request
groupedBy:group
inContext:[self currentContext]];
}
#endif
#pragma mark -
+ (NSArray *)findAllWithPredicate:(NSPredicate *)searchTerm inContext:(NSManagedObjectContext *)context
{
NSFetchRequest *request = [self createFetchRequestInContext:context];
[request setPredicate:searchTerm];
return [self executeFetchRequest:request
inContext:context];
}
+ (NSArray *)findAllWithPredicate:(NSPredicate *)searchTerm
{
return [self findAllWithPredicate:searchTerm
inContext:[self currentContext]];
}
+ (id)findFirstInContext:(NSManagedObjectContext *)context
{
NSFetchRequest *request = [self createFetchRequestInContext:context];
return [self executeFetchRequestAndReturnFirstObject:request inContext:context];
}
+ (id)findFirst
{
return [self findFirstInContext:[self currentContext]];
}
+ (id)findFirstByAttribute:(NSString *)attribute withValue:(id)searchValue inContext:(NSManagedObjectContext *)context
{
NSFetchRequest *request = [self requestFirstByAttribute:attribute withValue:searchValue inContext:context];
[request setPropertiesToFetch:[self propertiesNamed:[NSArray arrayWithObject:attribute]]];
return [self executeFetchRequestAndReturnFirstObject:request inContext:context];
}
+ (id)findFirstByAttribute:(NSString *)attribute withValue:(id)searchValue
{
return [self findFirstByAttribute:attribute
withValue:searchValue
inContext:[self currentContext]];
}
+ (id)findFirstWithPredicate:(NSPredicate *)searchTerm inContext:(NSManagedObjectContext *)context
{
NSFetchRequest *request = [self requestFirstWithPredicate:searchTerm];
return [self executeFetchRequestAndReturnFirstObject:request inContext:context];
}
+ (id)findFirstWithPredicate:(NSPredicate *)searchTerm
{
return [self findFirstWithPredicate:searchTerm inContext:[self currentContext]];
}
+ (id)findFirstWithPredicate:(NSPredicate *)searchterm sortedBy:(NSString *)property ascending:(BOOL)ascending inContext:(NSManagedObjectContext *)context
{
NSFetchRequest *request = [self requestAllSortedBy:property ascending:ascending withPredicate:searchterm inContext:context];
return [self executeFetchRequestAndReturnFirstObject:request inContext:context];
}
+ (id)findFirstWithPredicate:(NSPredicate *)searchterm sortedBy:(NSString *)property ascending:(BOOL)ascending
{
return [self findFirstWithPredicate:searchterm
sortedBy:property
ascending:ascending
inContext:[self currentContext]];
}
+ (id)findFirstWithPredicate:(NSPredicate *)searchTerm andRetrieveAttributes:(NSArray *)attributes inContext:(NSManagedObjectContext *)context
{
NSFetchRequest *request = [self createFetchRequestInContext:context];
[request setPredicate:searchTerm];
[request setPropertiesToFetch:[self propertiesNamed:attributes]];
return [self executeFetchRequestAndReturnFirstObject:request inContext:context];
}
+ (id)findFirstWithPredicate:(NSPredicate *)searchTerm andRetrieveAttributes:(NSArray *)attributes
{
return [self findFirstWithPredicate:searchTerm
andRetrieveAttributes:attributes
inContext:[self currentContext]];
}
+ (id)findFirstWithPredicate:(NSPredicate *)searchTerm sortedBy:(NSString *)sortBy ascending:(BOOL)ascending inContext:(NSManagedObjectContext *)context andRetrieveAttributes:(id)attributes, ...
{
NSFetchRequest *request = [self requestAllSortedBy:sortBy
ascending:ascending
withPredicate:searchTerm
inContext:context];
[request setPropertiesToFetch:[self propertiesNamed:attributes]];
return [self executeFetchRequestAndReturnFirstObject:request inContext:context];
}
+ (id)findFirstWithPredicate:(NSPredicate *)searchTerm sortedBy:(NSString *)sortBy ascending:(BOOL)ascending andRetrieveAttributes:(id)attributes, ...
{
return [self findFirstWithPredicate:searchTerm
sortedBy:sortBy
ascending:ascending
inContext:[self currentContext]
andRetrieveAttributes:attributes];
}
+ (NSArray *)findByAttribute:(NSString *)attribute withValue:(id)searchValue inContext:(NSManagedObjectContext *)context
{
NSFetchRequest *request = [self createFetchRequestInContext:context];
[request setPredicate:[NSPredicate predicateWithFormat:@"%K = %@", attribute, searchValue]];
return [self executeFetchRequest:request inContext:context];
}
+ (NSArray *)findByAttribute:(NSString *)attribute withValue:(id)searchValue
{
return [self findByAttribute:attribute
withValue:searchValue
inContext:[self currentContext]];
}
+ (NSArray *)findByAttribute:(NSString *)attribute withValue:(id)searchValue andOrderBy:(NSString *)sortTerm ascending:(BOOL)ascending inContext:(NSManagedObjectContext *)context
{
NSPredicate *searchTerm = [NSPredicate predicateWithFormat:@"%K = %@", attribute, searchValue];
NSFetchRequest *request = [self requestAllSortedBy:sortTerm ascending:ascending withPredicate:searchTerm inContext:context];
return [self executeFetchRequest:request];
}
+ (NSArray *)findByAttribute:(NSString *)attribute withValue:(id)searchValue andOrderBy:(NSString *)sortTerm ascending:(BOOL)ascending
{
return [self findByAttribute:attribute
withValue:searchValue
andOrderBy:sortTerm
ascending:ascending
inContext:[self currentContext]];
}
+ (id)createInContext:(NSManagedObjectContext *)context
{
NSString *entityName = NSStringFromClass([self class]);
return [NSEntityDescription insertNewObjectForEntityForName:entityName inManagedObjectContext:context];
}
+ (id)createEntity
{
NSManagedObject *newEntity = [self createInContext:[self currentContext]];
return newEntity;
}
- (BOOL)deleteInContext:(NSManagedObjectContext *)context
{
[context deleteObject:self];
return YES;
}
- (BOOL)deleteEntity
{
[self deleteInContext:[[self class] currentContext]];
return YES;
}
+ (BOOL)truncateAllInContext:(NSManagedObjectContext *)context
{
NSArray *allEntities = [self findAllInContext:context];
for (NSManagedObject *obj in allEntities)
{
[obj deleteInContext:context];
}
return YES;
}
+ (BOOL)truncateAll
{
[self truncateAllInContext:[self currentContext]];
return YES;
}
+ (NSNumber *)maxValueFor:(NSString *)property
{
NSManagedObject *obj = [[self class] findFirstByAttribute:property
withValue:[NSString stringWithFormat:@"max(%@)", property]];
return [obj valueForKey:property];
}
+ (id)objectWithMinValueFor:(NSString *)property inContext:(NSManagedObjectContext *)context
{
NSFetchRequest *request = [[self class] createFetchRequestInContext:context];
NSPredicate *searchFor = [NSPredicate predicateWithFormat:@"SELF = %@ AND %K = min(%@)", self, property, property];
[request setPredicate:searchFor];
return [[self class] executeFetchRequestAndReturnFirstObject:request inContext:context];
}
+ (id)objectWithMinValueFor:(NSString *)property
{
return [[self class] objectWithMinValueFor:property inContext:[self currentContext]];
}
@end
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