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


-

Comments

Post a Comment

Popular posts from this blog

c# - Binding a comma separated list to a List<int> in asp.net web api -

the default binder in web api expecst http://url.com/webapi/report/?pageids=3243&pageids=2365 to bind public ihttpactionresult report(list<int> pageids){ // exciting webapi code} i wish bind http://url.com/webapi/report/?pageids=3243,2365 as running out of space in url get . i have created class public class commaseparatedmodelbinder : system.web.http.modelbinding.imodelbinder { public bool bindmodel(httpactioncontext actioncontext, modelbindingcontext bindingcontext) { //binding in here } } and registered in webapiconfig.cs var provider = new simplemodelbinderprovider( typeof(list<int>), new commaseparatedmodelbinder()); config.services.insert(typeof(modelbinderprovider), 0, provider); i have altered method signature use model binder so public ihttpactionresult report( [modelbinder] list<int> pageids){ // exciting webapi code} however break point in binder not being ...
Read more

how to prompt save As Box in Excel Interlop c# MVC 4 -

i want export excel sheet using excel interloop... i have datatable convert excel sheet... now there way save file using save dialogue box in mvc 4 here code public string datatabletoexcel(datatable dt, string htmlheading, string key) { try { microsoft.office.interop.excel.application excel; microsoft.office.interop.excel.workbook excelworkbook; microsoft.office.interop.excel.worksheet excelsheet; microsoft.office.interop.excel.range excelcellrange; excel = new microsoft.office.interop.excel.application(); excel.visible = false; excel.displayalerts = false; excelworkbook = excel.workbooks.add(type.missing); excelsheet = (microsoft.office.interop.excel.worksheet)excelworkbook.activesheet; excelsheet.name = "sheet1"; dataset ...
Read more

xslt 1.0 - How to access or retrieve mets content of an item from another item? -

my use case have item has link in item. example, item 123456789/152 has metadata field dc.relation.hasversion=123456789/717 . within item view of 123456789/152 , how can retrieve values of metadata of 123456789/717 ? example, want retrieve dc.language.iso value of 123456789/717 123456789/152 . i looked @ related items feature in dspace don't know how metadata displayed in related items list pulled items in list. i using dspace version 5.3 mirage 2 theme . edit based on schweerelos answer, below actual code. using custom metadata field dc.relation.languageversion . basically, want link other version instead of displaying value, display dc.language.iso of other version in item-view.xsl . i've incorporated answer of schweerelos question in code just displaying value of dc.relation.languageversion . sample values of dc.relation.languageversion 10665.1/9843 ; 10665.1/9844 ie not complete uri handle. thanks in advance! actual code <xsl:template name=...
Read more