ios - Serialize a custom object with JSONModel -

i try create json file out of custom object jsonmodel framework ios. error:

-[jsonmodel.m:1077] exception: invalid type in json write (registerbuyerdataoption) -[jsonmodel.m:1077] exception: invalid type in json write (registerbuyerdataoption) -[jsonmodel.m:1077] exception: invalid type in json write (registerbuyerdata) 

registerbuyerdata.h

@interface registerbuyerdata : jsonmodel   @property (nonatomic, strong) nsstring              *buyerdataid; @property (nonatomic        ) registerbuyerdatatype  type; @property (nonatomic, strong) nsstring<optional>              *title; @property (nonatomic        ) bool                   required; @property (nonatomic, strong) nsstring              *value; @property (nonatomic)         nsnumber<optional>              *price; @property (nonatomic)         nsnumber<optional>              *availability;  @property (nonatomic, strong) nsarray<registerbuyerdata*>              *fields;  //array of more registerbuyerdata @property (nonatomic, strong) nsarray<registerbuyerdataoption*>        *options; //key,value array dropdown  @property (nonatomic, strong) nsarray                                  *parentvalue; @property (nonatomic, strong) nsarray<registerbuyerdata*>              *children; //array of more registerbuyerdata special selected value of options field  - (bool) isavailableforuser;  @end 

registerbuyerdata.m

@implementation registerbuyerdata  - (bool) isavailableforuser{      return (!_availability || [_availability integervalue] > 0 ); }   +(jsonkeymapper*)keymapper {     return [[jsonkeymapper alloc] initwithdictionary:@{@"id": @"buyerdataid",@"value": @"value"}]; }  @end 

registerbuyerdataoption.h

@interface registerbuyerdataoption : jsonmodel  @property (nonatomic, strong) nsstring *key; @property (nonatomic, strong) nsstring *value; @property (nonatomic, strong) nsnumber *price; @property (nonatomic, strong) nsnumber *availability;  - (bool) isavailableforuser;  @end 

is not possible create json string recursively? when call tojsonstring method these errors.

@property (nonatomic, strong) nsarray<registerbuyerdata*> *fields; 

should be

@property (nonatomic, strong) nsarray<registerbuyerdata> *fields; 

so rid of * , try again.

edit:

oh, see. seems haven't declared types want cascade protocols. following

registerbuyerdataoption.h

@protocol registerbuyerdataoption @end;  @interface registerbuyerdataoption : jsonmodel  @property (nonatomic, strong) nsstring *key; @property (nonatomic, strong) nsstring *value; @property (nonatomic, strong) nsnumber *price; @property (nonatomic, strong) nsnumber *availability;  - (bool) isavailableforuser;  @end 

registerbuyerdata.h

@protocol registerbuyerdata @end;  @interface registerbuyerdata : jsonmodel   @property (nonatomic, strong) nsstring              *buyerdataid; @property (nonatomic        ) registerbuyerdatatype  type; @property (nonatomic, strong) nsstring<optional>              *title; @property (nonatomic        ) bool                   required; @property (nonatomic, strong) nsstring              *value; @property (nonatomic)         nsnumber<optional>              *price; @property (nonatomic)         nsnumber<optional>              *availability;  @property (nonatomic, strong) nsarray<registerbuyerdata*>              *fields;  //array of more registerbuyerdata @property (nonatomic, strong) nsarray<registerbuyerdataoption*>        *options; //key,value array dropdown  @property (nonatomic, strong) nsarray                                  *parentvalue; @property (nonatomic, strong) nsarray<registerbuyerdata*>              *children; //array of more registerbuyerdata special selected value of options field  - (bool) isavailableforuser;  @end