objective c - Initialising CoreData in AppleScript-objc -

i'm trying write , read coredata on osx, combinig cocoa classes applescript-objc. wrote methods handle coredata in tutorial (youtube, cocoa tutorial: core data introduction in ios , mac os programming part 2) <- cocoa classes in project

i have class called coredatahelper defines methods manipulate core data. here of them:

+(nsmanagedobjectcontext *) managedobjectcontext{     nserror*error;     [[nsfilemanager defaultmanager] createdirectoryatpath:[coredatahelper directoryfordatabasefilename] withintermediatedirectories:yes attributes:nil error:&error];      if(error){         nslog(@"%@", [error localizeddescription]);         return nil;     }      nsstring* path = [nsstring stringwithformat:@"%@/%@",[coredatahelper directoryfordatabasefilename],[coredatahelper databasefilename]];     nsurl *url = [nsurl fileurlwithpath:path];     nsmanagedobjectmodel* managedmodel = [nsmanagedobjectmodel mergedmodelfrombundles:nil];     nspersistentstorecoordinator* storecordinator = [[nspersistentstorecoordinator alloc] initwithmanagedobjectmodel:managedmodel];      if(![storecordinator addpersistentstorewithtype:nssqlitestoretype configuration:nil url:url options:nil error:&error]){         nslog(@"%@",[error localizeddescription]);         return nil;     }      nsmanagedobjectcontext* managedobjectcontext = [[nsmanagedobjectcontext alloc] initwithconcurrencytype:nsmainqueueconcurrencytype];      return managedobjectcontext; }   +(id)insertmanagedobjectofclass:(class) aclass inmanagedobjectcontext:(nsmanagedobjectcontext *)managedobjectcontext{     nsmanagedobject* managedobject = [nsentitydescription insertnewobjectforentityforname:nsstringfromclass(aclass) inmanagedobjectcontext:managedobjectcontext];      return managedobject; } 

i'm using .xcdatamodeld model. have 2 entities in classes each 1 of them:

1. tab
2. service

tab.h looks this

#import <foundation/foundation.h> #import <coredata/coredata.h>  @class service;  ns_assume_nonnull_begin  @interface tab : nsmanagedobject  // insert code here declare functionality of managed object subclass  @end  ns_assume_nonnull_end  #import "tab+coredataproperties.h" 

and tab.m looks this:

#import "tab.h" #import "service.h"  @implementation tab  // insert code here add functionality managed object subclass  @end 

tab+coredataproperties.h:

 #import "tab.h"      ns_assume_nonnull_begin      @interface tab (coredataproperties)      @property (nullable, nonatomic, retain) nsstring *nzakladka;     @property (nullable, nonatomic, retain) nsstring *uzakladka;     @property (nullable, nonatomic, retain) service *podstronaserwisu;      @end      ns_assume_nonnull_end 

tab+coredataproperties.m: #import "tab+coredataproperties.h"

@implementation tab (coredataproperties)  @dynamic nzakladka; @dynamic uzakladka; @dynamic podstronaserwisu;  @end 

now, appdelegate.applescript looks this

...  property coredatahelper: class "coredatahelper" property cservice: class "service" property ctab: class "tab"  script appdelegate    on applicationwillfinishlaunching_(anotification)      set thecontext coredatahelper's managedobjectcontext()      set cctab ctab's alloc()'s init()      //the 1 below cause error "coredata: error: failed call designated initializer on nsmanagedobject class 'tab'"     set thetab coredatahelper's insertmanagedobjectofclass_inmanagedobjectcontext_(cctab, thecontext)    end applicationwillfinishlaunching_  ...  end script 

when run whole thing got error message posted in commented line in applescriptobjc code. method causing error nsmanagedobject* managedobject = [nsentitydescription insertnewobjectforentityforname:nsstringfromclass(aclass) inmanagedobjectcontext:managedobjectcontext]; problem?