ios - Delete Core Data Entry from Table View Controller -

i trying delete core data entry table view controller, when swipe left, delete button comes , deletes entry. unfortunately, getting error: "property 'classes' not found on type "classtableviewcontroller *" on line 251 , 260 (code posted below) , not sure do. have nsmutableobject class called classes.m , classes.h, , have been imported, xcode doesn't seem recognize it.

here code:

classtableviewcontroller.m

#import "classtableviewcontroller.h" #import "classes.m" #import "classes.h" #import "classtableviewcell.h" #import "newclassviewcontroller.h" #import <coredata/coredata.h>  @interface classtableviewcontroller () - (void)configurecell:(classtableviewcell *)cell atindexpath:(nsindexpath *)indexpath; @end  @implementation classtableviewcontroller  @synthesize fetchedresultscontroller = _fetchedresultscontroller; @synthesize managedobjectcontext = _managedobjectcontext; @synthesize managedobjectmodel = _managedobjectmodel;   - (id)initwithstyle:(uitableviewstyle)style {     self = [super initwithstyle:style];     if (self) {         // custom initialization     }     return self; }  #pragma mark - segue  - (void) prepareforsegue:(uistoryboardsegue *)segue sender:(id)sender {     if ( [[segue identifier] isequaltostring:@"showclass"] ){         newclassviewcontroller *dvc = (newclassviewcontroller *)[segue destinationviewcontroller];         nsindexpath *indexpath = [self.tableview indexpathforselectedrow];         classes *classid = [[self fetchedresultscontroller] objectatindexpath:indexpath];         [dvc setclassid:classid];      } else if  ([[segue identifier] isequaltostring:@"addclass"]) {         newclassviewcontroller *dvc = (newclassviewcontroller *)[[segue destinationviewcontroller] topviewcontroller];         [dvc setclassid:[nsentitydescription insertnewobjectforentityforname:@"myclassesid" inmanagedobjectcontext:self.managedobjectcontext]];     }  }  #pragma mark - view lifecycle  - (void)viewdidload {     [super viewdidload];       // uncomment following line preserve selection between presentations.     // self.clearsselectiononviewwillappear = no;      // uncomment following line display edit button in navigation bar view controller.     // self.navigationitem.rightbarbuttonitem = self.editbuttonitem;      self.navigationitem.leftbarbuttonitem = [[uibarbuttonitem alloc] initwithbarbuttonsystemitem:uibarbuttonsystemitemdone target:self action:@selector(firstdone)];      if (_managedobjectcontext == nil)     {         _managedobjectcontext = [(classtableviewcontroller *)[[uiapplication sharedapplication] delegate] managedobjectcontext];         nslog(@"after managedobjectcontext: %@",  _managedobjectcontext);     }   }  - (void)viewdidunload {     [super viewdidunload];     // release retained subviews of main view.     // e.g. self.myoutlet = nil; }  - (void) firstdone {      [self.navigationcontroller  dismissmodalviewcontrolleranimated:yes]; }   - (void)didreceivememorywarning {     [super didreceivememorywarning];     // dispose of resources can recreated. }  #pragma mark - table view data source  - (nsinteger)numberofsectionsintableview:(uitableview *)tableview {     // return number of sections.     return [[self.fetchedresultscontroller sections] count]; }  - (nsinteger)tableview:(uitableview *)tableview numberofrowsinsection:(nsinteger)section {      id <nsfetchedresultssectioninfo> sectioninfo = [[self.fetchedresultscontroller sections] objectatindex:section];      return [sectioninfo numberofobjects]; }  - (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath {      static nsstring *cellidentifier = @"classescell";      classtableviewcell *cell = [tableview dequeuereusablecellwithidentifier:cellidentifier];      if (cell == nil) {         cell = [[classtableviewcell alloc] initwithstyle:uitableviewcellstyledefault reuseidentifier:cellidentifier];     }      [self configurecell:cell atindexpath:indexpath];      return cell; }  #pragma mark - table view delegate   - (void)configurecell:(classtableviewcell *)cell atindexpath:(nsindexpath *)indexpath {     classes *classid = [self.fetchedresultscontroller objectatindexpath:indexpath];     cell.classlabel.text = classid.classtitle;     cell.periodlabel.text = classid.period; }    #pragma mark - fetched results controller  - (nsfetchedresultscontroller *)fetchedresultscontroller {     if (_fetchedresultscontroller != nil) {         return _fetchedresultscontroller;     }      nsfetchrequest *fetchrequest = [[nsfetchrequest alloc] init];     nsentitydescription *entity = [nsentitydescription entityforname:@"myclassesid" inmanagedobjectcontext:self.managedobjectcontext];     assert(self.managedobjectcontext);      [fetchrequest setentity:entity];      [fetchrequest setfetchbatchsize:20];      nssortdescriptor *sortdescriptor = [[nssortdescriptor alloc] initwithkey:@"period" ascending:yes];     nsarray *sortdescriptors = [nsarray arraywithobjects:sortdescriptor, nil];    [fetchrequest setsortdescriptors:sortdescriptors];      nsfetchedresultscontroller *afetchedresultscontroller = [[nsfetchedresultscontroller alloc] initwithfetchrequest:fetchrequest managedobjectcontext:self.managedobjectcontext sectionnamekeypath:nil cachename:@"master"];     afetchedresultscontroller.delegate = self;     self.fetchedresultscontroller = afetchedresultscontroller;      nserror *error = nil;      if (![self.fetchedresultscontroller performfetch:&error]) {         /*          replace implementation code handle error appropriately.           abort() causes application generate crash log , terminate. should not use function in shipping application, although may useful during development.          */         nslog(@"unresolved error %@, %@", error, [error userinfo]);         abort();     }      return _fetchedresultscontroller;   }  - (void)controllerwillchangecontent:(nsfetchedresultscontroller *)controller {     [self.tableview beginupdates]; }   - (void)controller:(nsfetchedresultscontroller *)controller didchangesection:(id <nsfetchedresultssectioninfo>)sectioninfo            atindex:(nsuinteger)sectionindex forchangetype:(nsfetchedresultschangetype)type {      switch(type) {         case nsfetchedresultschangeinsert:             [self.tableview insertsections:[nsindexset indexsetwithindex:sectionindex]                           withrowanimation:uitableviewrowanimationfade];             break;          case nsfetchedresultschangedelete:             [self.tableview deletesections:[nsindexset indexsetwithindex:sectionindex]                           withrowanimation:uitableviewrowanimationfade];             break;     } }   - (void)controller:(nsfetchedresultscontroller *)controller didchangeobject:(id)anobject        atindexpath:(nsindexpath *)indexpath forchangetype:(nsfetchedresultschangetype)type       newindexpath:(nsindexpath *)newindexpath {      uitableview *tableview = self.tableview;      switch(type) {          case nsfetchedresultschangeinsert:             [tableview insertrowsatindexpaths:[nsarray arraywithobject:newindexpath]                              withrowanimation:uitableviewrowanimationfade];             break;          case nsfetchedresultschangedelete:             [tableview deleterowsatindexpaths:[nsarray arraywithobject:indexpath]                              withrowanimation:uitableviewrowanimationfade];             break;          case nsfetchedresultschangeupdate:             [self configurecell:[tableview cellforrowatindexpath:indexpath]                     atindexpath:indexpath];             break;          case nsfetchedresultschangemove:             [tableview deleterowsatindexpaths:[nsarray arraywithobject:indexpath]                              withrowanimation:uitableviewrowanimationfade];             [tableview insertrowsatindexpaths:[nsarray arraywithobject:newindexpath]                              withrowanimation:uitableviewrowanimationfade];             break;     } }   - (void)controllerdidchangecontent:(nsfetchedresultscontroller *)controller {     [self.tableview endupdates]; }  - (bool)tableview:(uitableview *)tableview caneditrowatindexpath:(nsindexpath *)indexpath {     // return no if not want specified item editable.     return yes; }   - (void)tableview:(uitableview *)tableview commiteditingstyle:(uitableviewcelleditingstyle)editingstyle forrowatindexpath:(nsindexpath *)indexpath {     nsmanagedobjectcontext *context = [self managedobjectcontext];      if (editingstyle == uitableviewcelleditingstyledelete) {         // delete object database         [context deleteobject:[self.classes objectatindex:indexpath.row]];          nserror *error = nil;         if (![context save:&error]) {             nslog(@"can't delete! %@ %@", error, [error localizeddescription]);             return;         }          // remove device table view         [self.classes removeobjectatindex:indexpath.row];         [self.tableview deleterowsatindexpaths:[nsarray arraywithobject:indexpath] withrowanimation:uitableviewrowanimationfade];     } }  /* // override support conditional editing of table view. - (bool)tableview:(uitableview *)tableview caneditrowatindexpath:(nsindexpath *)indexpath {     // return no if not want specified item editable.     return yes; } */  /* // override support editing table view. - (void)tableview:(uitableview *)tableview commiteditingstyle:(uitableviewcelleditingstyle)editingstyle forrowatindexpath:(nsindexpath *)indexpath {     if (editingstyle == uitableviewcelleditingstyledelete) {         // delete row data source         [tableview deleterowsatindexpaths:@[indexpath] withrowanimation:uitableviewrowanimationfade];     }        else if (editingstyle == uitableviewcelleditingstyleinsert) {         // create new instance of appropriate class, insert array, , add new row table view     }    } */  /* // override support rearranging table view. - (void)tableview:(uitableview *)tableview moverowatindexpath:(nsindexpath *)fromindexpath toindexpath:(nsindexpath *)toindexpath { } */  /* // override support conditional rearranging of table view. - (bool)tableview:(uitableview *)tableview canmoverowatindexpath:(nsindexpath *)indexpath {     // return no if not want item re-orderable.     return yes; } */  /* #pragma mark - navigation  // in story board-based application, want little preparation before navigation - (void)prepareforsegue:(uistoryboardsegue *)segue sender:(id)sender {     // new view controller using [segue destinationviewcontroller].     // pass selected object new view controller. }   */  @end 

the code in receiving error:

line 251:

    [context deleteobject:[self.classes objectatindex:indexpath.row]]; 

line 260:

    [self.classes removeobjectatindex:indexpath.row]; 

first of all, remove #import "classes.m". second, assume self.classes array, raises 2 questions:

1. if class named classes, why variable named classes well? rename variable vclasses or aclasses or classes. also, make sure self.classes (or in yourcase self.classes) being initialized properly. debug!
2. why using array classes objects, when have nsfetchedresultscontroller setup? should use self.fetchedresultscontroller instead.

hope helps.