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NSManagedObjectContext+Convenience.m
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NSManagedObjectContext+Convenience.m
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#import "NSManagedObjectContext+Convenience.h"
@implementation NSManagedObjectContext (insert)
-(NSManagedObject *) insertNewEntityWithName:(NSString *)name
{
return [NSEntityDescription insertNewObjectForEntityForName:name inManagedObjectContext:self];
}
@end
@interface NSManagedObjectContext (EntitiesPrivate)
//case insensitive
- (BOOL)entityWithNameExists:(NSString *)entityName whereKey:(NSString *)key caseInsensitiveLike:(NSString *)value;
- (id)entityWithName:(NSString *)entityName whereKey:(NSString *)key caseInsensitiveLike:(NSString *)value;
//------
@end
@implementation NSManagedObjectContext (EntitiesPrivate)
#pragma mark -
#pragma mark Case Insensitive Always
- (BOOL)entityWithNameExists:(NSString *)entityName whereKey:(NSString *)key caseInsensitiveLike:(NSString *)value{
return [self entityWithName:entityName whereKey:key caseInsensitiveLike:value] != nil;
}
- (id)entityWithName:(NSString *)entityName whereKey:(NSString *)key caseInsensitiveLike:(NSString *)value
{
NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease];
[request setEntity:[NSEntityDescription entityForName:entityName inManagedObjectContext:self]];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"%K like[c] %@",key , value];
[request setPredicate:predicate];
return [[self executeFetchRequest:request error:NULL] firstObject];
}
@end
@implementation NSManagedObjectContext (Entities)
// Convenience method to fetch the array of objects for a given Entity
// name in the context, optionally limiting by a predicate or by a predicate
// made from a format NSString and variable arguments.
//
- (NSSet *)fetchObjectsForEntityName:(NSString *)newEntityName
withPredicate:(id)stringOrPredicate, ...
{
NSEntityDescription *entity = [NSEntityDescription
entityForName:newEntityName inManagedObjectContext:self];
NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease];
[request setEntity:entity];
if (stringOrPredicate)
{
NSPredicate *predicate;
if ([stringOrPredicate isKindOfClass:[NSString class]])
{
va_list variadicArguments;
va_start(variadicArguments, stringOrPredicate);
predicate = [NSPredicate predicateWithFormat:stringOrPredicate
arguments:variadicArguments];
va_end(variadicArguments);
}
else
{
NSAssert2([stringOrPredicate isKindOfClass:[NSPredicate class]],
@"Second parameter passed to %s is of unexpected class %@",
sel_getName(_cmd), [[stringOrPredicate class] description]);
predicate = (NSPredicate *)stringOrPredicate;
}
[request setPredicate:predicate];
}
NSError *error = nil;
NSArray *results = [self executeFetchRequest:request error:&error];
if (error != nil)
{
[NSException raise:NSGenericException format:[error description]];
}
return [NSSet setWithArray:results];
}
//Containing strings
- (BOOL)entityWithNameExists:(NSString *)entityName whereKey:(NSString *)key contains:(NSString *)value{
return [self entityWithName:entityName whereKey:key contains:value] != nil;
}
- (id)entityWithName:(NSString *)entityName whereKey:(NSString *)key contains:(NSString *)value{
NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease];
[request setEntity:[NSEntityDescription entityForName:entityName inManagedObjectContext:self]];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"%K contains[c] %@",key , value];
[request setPredicate:predicate];
return [[self executeFetchRequest:request error:NULL] firstObject];
}
- (NSArray*)entitiesWithName:(NSString *)entityName whereKey:(NSString *)key contains:(NSString *)value{
NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease];
[request setEntity:[NSEntityDescription entityForName:entityName inManagedObjectContext:self]];
if ((nil != key)&&(nil != value)) {
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"%K contains[c] %@",key , value];
[request setPredicate:predicate];
}
// predicate to limit size
return [self executeFetchRequest:request error:NULL];
}
#pragma mark -
#pragma mark Case Insensitive Optional
- (BOOL)entityWithNameExists:(NSString *)entityName whereKey:(NSString *)key like:(NSString *)value caseInsensitive:(BOOL)flag{
if(flag)
return [self entityWithNameExists:entityName whereKey:key caseInsensitiveLike:value];
else
return [self entityWithNameExists:entityName whereKey:key like:value];
}
- (id)entityWithName:(NSString *)entityName whereKey:(NSString *)key like:(NSString *)value caseInsensitive:(BOOL)flag{
if(flag)
return [self entityWithName:entityName whereKey:key caseInsensitiveLike:value];
else
return [self entityWithName:entityName whereKey:key like:value];
}
#pragma mark -
#pragma mark Equality
- (BOOL)entityWithNameExists:(NSString *)entityName whereKey:(NSString *)key equalToObject:(id )value{
return [self entityWithName:entityName whereKey:key equalToObject:value] != nil;
}
- (id)entityWithName: (NSString*)entityName whereKey: (NSString*)key equalToObject: (id)value
{
NSFetchRequest* request = [[NSFetchRequest alloc] init];
[request setEntity: [NSEntityDescription entityForName: entityName inManagedObjectContext: self]];
NSPredicate* predicate = [NSPredicate predicateWithFormat: @"%K == %@", key, value]; //[NSPredicate predicateWithFormat:@"%K == %@", key, value];
[request setFetchLimit: 1];
[request setPredicate: predicate];
// [predicate release];
// predicate = nil;
NSArray* fetchResults = [self executeFetchRequest: request error: NULL];
[request release];
request = nil;
//return [[self executeFetchRequest:request error:NULL] firstObject];
return [fetchResults firstObject];
}
- (id)retrieveOrCreateEntityWithName:(NSString *)entityName whereKey:(NSString *)key equalToObject:(id )value
{
id obj = [self entityWithName:entityName whereKey:key equalToObject:value];
if (!obj) {
obj = [NSEntityDescription insertNewObjectForEntityForName:entityName inManagedObjectContext:self];
[obj setValue:value forKey:key];
}
return obj;
}
#pragma mark -
- (BOOL)entityWithNameExists:(NSString *)entityName whereKey:(NSString *)key like:(NSString *)value
{
return [self entityWithName:entityName whereKey:key like:value] != nil;
}
- (id)entityWithName:(NSString *)entityName whereKey:(NSString *)key like:(NSString *)value
{
NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease];
[request setEntity:[NSEntityDescription entityForName:entityName inManagedObjectContext:self]];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"%K like %@",key , value];
[request setPredicate:predicate];
return [[self executeFetchRequest:request error:NULL] firstObject];
}
- (NSArray*)entitiesWithName: (NSString*)entityName whereKey: (NSString*)key isIn: (id)collection
{
NSArray* result = nil;
NSFetchRequest* request = [[NSFetchRequest alloc] init];
//debugLog(@"searching for entities with name %@ where %@ is in %@ (length %d)", entityName, key, collection, [collection count]);
[request setEntity: [NSEntityDescription entityForName: entityName inManagedObjectContext: self]];
[request setFetchLimit: [collection count]];
//[request setResultType: NSManagedObjectIDResultType];
NSPredicate* predicate = [NSPredicate predicateWithFormat: @"%K in %@", key, collection];
[request setPredicate: predicate];
result = [self executeFetchRequest: request error: NULL];
[request release];
request = nil;
return result;
}
- (id)retrieveOrCreateEntityWithName:(NSString *)entityName whereKey:(NSString *)key like:(NSString *)value
{
id obj = [self entityWithName:entityName whereKey:key like:value];
if (!obj) {
obj = [NSEntityDescription insertNewObjectForEntityForName:entityName inManagedObjectContext:self];
[obj setValue:value forKey:key];
}
return obj;
}
- (id)createEntity:(NSString *)entityName withUniqueValueForKey:(NSString *)key defaultValue:(NSString *)def
{
NSManagedObject *object = [NSEntityDescription insertNewObjectForEntityForName:entityName
inManagedObjectContext:self];
NSString *baseName = def;
NSString *suggestedName = baseName;
int counter = 1;
//find a unique name for the New Collection
BOOL go = YES;
while (go) {
NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease];
[request setEntity:[NSEntityDescription entityForName:entityName inManagedObjectContext:self]];
[request setPredicate:[NSPredicate predicateWithFormat:@"%K like %@",key,suggestedName]];
int count = [self countForFetchRequest:request error:NULL];
if (count != 0) {
suggestedName = [NSString stringWithFormat:@"%@ %i",baseName,counter];
counter++;
} else
go = NO;
}
[object setValue:suggestedName forKey:key];
return object;
}
- (int)numberOfEntitiesWithName:(NSString *)entityName
{
NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease];
[request setEntity:[NSEntityDescription entityForName:entityName inManagedObjectContext:self]];
return [self countForFetchRequest:request error:NULL];
}
- (NSArray *)entitiesWithName:(NSString *)entityName predicate:(NSPredicate*)predicate{
NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease];
[request setEntity:[NSEntityDescription entityForName:entityName inManagedObjectContext:self]];
[request setPredicate:predicate];
return [self executeFetchRequest:request error:NULL];
}
- (NSArray *)entitiesWithName:(NSString *)entityName
{
NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease];
[request setEntity:[NSEntityDescription entityForName:entityName inManagedObjectContext:self]];
return[self executeFetchRequest:request error:NULL];
}
- (int)numberOfEntitiesWithName:(NSString *)entityName where:(NSString *)key like:(NSString *)value
{
NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease];
[request setEntity:[NSEntityDescription entityForName:entityName inManagedObjectContext:self]];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"%K like %@",key , value];
[request setPredicate:predicate];
return [self countForFetchRequest:request error:NULL];
}
- (NSArray *)entitiesWithName:(NSString *)entityName where:(NSString *)key like:(NSString *)value
{
NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease];
[request setEntity:[NSEntityDescription entityForName:entityName inManagedObjectContext:self]];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"%K like %@",key , value];
[request setPredicate:predicate];
return [self executeFetchRequest:request error:NULL];
}
- (NSArray*)objectsWithObjectIDs:(NSArray*)originalObjectIDs{
NSMutableArray* newObjects = [NSMutableArray arrayWithCapacity:[originalObjectIDs count]];
[originalObjectIDs enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
NSManagedObject* newObj = [self objectWithID:(NSManagedObjectID*)obj];
[newObjects addObject:newObj];
}];
return newObjects;
}
- (NSArray*)objectsWithObjectsFromOtherContext:(NSArray*)originalObjects{
NSMutableArray* newObjects = [NSMutableArray arrayWithCapacity:[originalObjects count]];
[originalObjects enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
NSManagedObjectID* anID = [(NSManagedObject*)obj objectID];
NSManagedObject* newObj = [self objectWithID:anID];
[newObjects addObject:newObj];
}];
return newObjects;
}
- (NSManagedObject*)objectWithObjectFromOtherContext:(NSManagedObject*)originalObject{
NSManagedObjectID* anID = [(NSManagedObject*)originalObject objectID];
NSManagedObject* newObj = [self objectWithID:anID];
return newObj;
}
@end
@implementation NSArray (CDArrayExtensions)
- (id)firstObject
{
if ([self count] > 0)
return [self objectAtIndex:0];
return nil;
}
@end
@implementation NSManagedObjectContext (DictionaryExtensions)
- (NSMutableDictionary*) mutableDictionaryForEntityWithName:(NSString*)entityName keyedBy:(NSString*)keyName
{
NSArray* entities = [self entitiesWithName:entityName];
NSMutableDictionary* dict = [NSMutableDictionary dictionaryWithCapacity:[entities count]];
for( NSManagedObject* obj in entities )
{
[dict setObject:obj forKey:[obj valueForKey:keyName]];
}
return dict;
}
@end