ios - RLMArray<> returns different instances each time -


@realm:

why rlmarray gives different instances of objects @ runtime?

this how defined rlmarray:

@property rlmarray<houseimage> *images;

i add/remove houseimage objects array time (in transactions).

when i'm accessing images as:

_house.images[indexpath.row]

every time different instances i.e.

(lldb) p _house (rlmaccessor_v0_house *) $52 = 0x00000001701a5780 2015-08-30 23:02:07.695 apt note[5992:1308601] loading image named: 1c178a31-5f33-4cd3-9b7c-b026df7a5e19_2 2015-08-30 23:02:07.731 apt note[5992:1308601] loading image named: cfd99689-12c4-49cb-aab6-850ffcd902d7_3 2015-08-30 23:02:07.750 apt note[5992:1308601] loading image named: 194d55ea-125a-4cfc-8ccf-758e929be7d5_4  // first time when iterating array. [house] object remains same, not images array items. (lldb) p _house (rlmaccessor_v0_house *) $53 = 0x00000001701a5780 (lldb) p _house.images[0] (rlmaccessor_v0_houseimage *) $54 = 0x00000001740bbf60 2015-08-30 23:02:36.947 apt note[5992:1308601] loading image named: 1c178a31-5f33-4cd3-9b7c-b026df7a5e19_2 2015-08-30 23:02:36.986 apt note[5992:1308601] loading image named: cfd99689-12c4-49cb-aab6-850ffcd902d7_3 2015-08-30 23:02:37.031 apt note[5992:1308601] loading image named: 194d55ea-125a-4cfc-8ccf-758e929be7d5_4  // second iteration (lldb) p _house (rlmaccessor_v0_house *) $55 = 0x00000001701a5780 (lldb) p _house.images[0] (rlmaccessor_v0_houseimage *) $56 = 0x00000001740bc140

if see log, house object remains same. however, instances in rlmarray(images) have changed out of nowhere. nobody other piece of code reading/writing realm while happening.

does have idea why happening?

if i'm not clear, please let me know, try explain more clearly.

this expected behavior. in order realize zero-copy storage system, realm not hold actual data @ all. realm swizzles property accessors persisted properties dynamically fetch properties, when access property multiple times, returns different instance each time, design. rlmarray same　as it. each time want access elements of rlmarray, realm returns creating different proxy object.

fyi: if objects not persisted, rlmarray returns same instances every time. because rlmarray backed nsarray https://github.com/realm/realm-cocoa/blob/master/realm/rlmarray.mm#l153-l159.

but once object persisted, rlmarray changes rlmarraylinkview. above reasons, rlmarraylinkview return different instances every time. https://github.com/realm/realm-cocoa/blob/master/realm/rlmarraylinkview.mm#l193-l197


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