ios - Core Data and NSSortDescriptor - memory basics -

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i'm trying sort on core data entity's relation. instance there employee object , has departments relationship.

  1. i nsfetchrequest of employee
  2. i write method take out departments (nsset) , gets me sorted departments

the code i'm using following.

[temparray sortedarrayusingdescriptors:[nsarray arraywithobject:sortdescriptor]];

i see memory getting retained after sometime , core data object in getting retained after long time.

i removed line thinking reason

//[moc setretainsregisteredobjects:yes];

but not helping. want understand objects method on nsset of core data object cause bump in memory , sortedarrayusingdescriptors deep copy? know shallow copy, please confirm , logical reason memory getting retained after usage of array of object got using sortedarrayusingdescriptors.

as stated in comment, should provide context question. so, did see behavior in instrument?

anyway, instead of fetching , sorting, can fetch and, @ same time, sort (through nsfetchrequest using setsortdescriptors:) against department based on specific predicate (if understood problem predicate give departments belong specific employee). in way sorting done @ sql level.

you should provide code using concerning

[temparray sortedarrayusingdescriptors:[nsarray arraywithobject:sortdescriptor]];

what sortdescriptor? if not using arc, alloc-init new sortdescriptor must dealloc it. otherwise have leak.


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