iphone - Core Data `deleteObject:` problem! -

-

i have following entities in core data shown in figure below. core data model

the delete rule relationship cascade.

questions: when ever delete 1 of entity object @ level 2 , [context save:&error]; other objects in table entity1 gets data fault , app crashes due not able read entity1 object more, giving exc_bad_access error.

i using code

for(entity1 *entity in listofentitys) {     if(entity.relation1)         [context deleteobject:entity.relation1];      if(entity.relation2)         [context deleteobject:entity.relation2];      if(entity.relation3)         [context deleteobject:entity.relation3]; } [context save:&error];

its not have never deleted object core data place problem occurring. can help.

thanks.
ps. have seen other questions on none has same kind of situation do.

edit:

my problem when try delete 1 object level 2 objects in entity1 getting data fault. thing this.

printing description of listofentitys:  (     "<entity1: 0x4dc3d80> (entity: entity1; id: 0x4dc2d60 <x-coredata://df11191d-0be9-4a63-955d-0a43153290a4/entity1/p5> ; data: <fault>)",     "<entity1: 0x5b06ea0> (entity: entity1; id: 0x5b077d0 <x-coredata://df11191d-0be9-4a63-955d-0a43153290a4/entity1/p6> ; data: <fault>)",     "<entity1: 0x4dc2cf0> (entity: entity1; id: 0x4dc2df0 <x-coredata://df11191d-0be9-4a63-955d-0a43153290a4/entity1/p7> ; data: <fault>)",     "<entity1: 0x4dc2b80> (entity: entity1; id: 0x4dc3640 <x-coredata://df11191d-0be9-4a63-955d-0a43153290a4/entity1/p8> ; data: <fault>)"  )

from core data programming guide

if relationship delete rule cascade, deleting 1 object may result in deletion of others.

if don't want related objects deleted when delete given object, deletion rule relationships should other 'cascade'. want 'nullify' instead.


Comments

Post a Comment

Popular posts from this blog

php - What is the difference between $_SERVER['PATH_INFO'] and $_SERVER['ORIG_PATH_INFO']? -

-
what’s difference between $_server['path_info'] , $_server['orig_path_info'] ? how use them? when run print_r($_server) , path_info , orig_path_info not present in array. why not? how can enable them? i have read php manual on them, still don’t understand them. the path_info variable present if invoke php script this: http://www.example.com/phpinfo.php/hello_there it's /hello_there part after .php script. if don't invoke url that, there won't $_server["path_info"] environment variable. the porig_ prefix uncommon. path_info standard cgi-environment variable, , should never prefixed. did read that? (there issues around php3/php4 if invoked php interpreter via cgi-bin/ - hardly has such setups today.) for reference: http://www.ietf.org/rfc/rfc3875
Read more

fortran - Function return type mismatch -

-
i'm attempting recode old c++ program in fortran make use of lapack (i'm aware c++ have lapack++, i'm having lot of trouble installing it, gave up). i didn't have problems compilation, when had variables declared real . when started coding section of program required lapack, found parameters passed dsyev need double precision . tried change double precision (including changing hard coded numbers double precision counterparts, i.e. 0.0 -> 0.0d0) when try compile, following error of functions , subroutines i've written: error: return type mismatch of function <function> @ (1) (real(4)/real(8)) i'm not sure coming from, in program has been changed double precision. for example, i've declared following: double precision :: alpha(3),d(3),zeta1,zeta2 double precision :: a1(3),a2(3),d1(3),d2(3) double precision :: pi pi = 3.14159265359d0 alpha = (/0.109818d0, 0.405771d0, 2.22766d0/) d = (/0.444635d0, 0.535328d0, 0.154329d0 /) 10 i=1,3 ...
Read more

queue - mq_receive: message too long -

-
i implementing communication between 2 processes using queue. problem when call function mq_receive, error: message long. i have done following: struct mq_attr attr; long size = attr.mq_msgsize; .... // initializing queue "/gateway" int rc = mq_receive(gateway, buffer, size, &prio); if print size value, size=1, while when print same size program (got same mechanism), not long integer ( -1217186280 )... how can solve error?....so while size = 1, believe it's right "message long" why 1? p.s. have tried put : int rc = mq_receive(gateway, buffer, sizeof(buffer), &prio); but no result. it seems need read docs more carefully. when call mq_receive should pass size of destination buffer. this size must greater mq_msgsize attribute of queue . in addition, seems have error in queue attributes initialisation makes proper mq_receive call impossible. here standard message queue session: fill mq_attr struct ( doc ): struct mq_a...
Read more