NsArray ContainsObject无法与自定义NsObject类一起使用

Question

I am checking if my one of the array consist the Nsobject which i have created custom way. i am using ContainsObject method.my problem is that contains object not working ever.even though i have same object in array its not returning the true value.

if([self.arrSelectedInterest containsObject:interest_ent])

i am also attaching the screen shot of my debug points which showing the value of the nsarray and comparing object and in that i found that interest_ent is a same object that contains in self.arrSelectedInterest and still it always return false.

anyone have any idea how to check if my nsarray of custom nsobject contains specific Object?

Following is my hash and isEqual Method which i have overriden and also shwoing my property types in nsobejct. @interface InterestEntity : JSONModel

@property (strong, nonatomic) NSString* InterestId;
@property (strong, nonatomic) NSString* Name;
@property (strong, nonatomic) NSString<Optional>* Code;
@property (strong, nonatomic) NSString<Optional>* Description;
@property (strong, nonatomic) NSArray<Optional>* Hashtags;


- (NSUInteger)hash {
    NSUInteger result = 1;
    NSUInteger prime = 31;

    result = prime * result + [self.InterestId hash];
    result = prime * result + [self.Name hash];
    result = prime * result + [self.Code hash];
    result = prime * result + [self.Description hash];
    result = prime * result + [self.Hashtags hash];
    return result;
}
- (BOOL)isEqual:(id)object {
    BOOL result = NO;

    if ([object isKindOfClass:[self class]]) {
        result = [[self InterestId] isEqualToString:[object InterestId]] &&
        [[self Name] isEqualToString:[object Name]] &&
        [[self Code] isEqualToString:[object Code]] &&[[self Description] isEqualToString:[object Description]] && [[self Hashtags] isEqual:[object Hashtags]];
    }

    return result;
}

Answer 1

the problem is in implementing isEqual method in handling nullable objects

ie if two strings is null isEqualToString: will return false

Here is a proper implementation to handle all cases

- (BOOL)isEqual:(id)object {
    if (object == self)
        return YES;
    if (!object || ![object isKindOfClass:[self class]])
        return NO;

    // not nullable fields
    if (![self.interestId isEqualToString:object.interestId])    
        return NO;   
    if (![self.name isEqualToString:object.name])    
        return NO;
    if (![self.code isEqualToString:object.code])    
        return NO;

    // nullable fields (2 if statements for more clean code)
    if (self.description != null && ![self.description isEqualToString:object.description])    
        return NO;    
    if (object.description != null && ![object.description isEqualToString:self.description])    
        return NO;

    if (self.hashtags != null && ![self.hashtags isEqualToString:object.hashtags])    
        return NO;    
    if (object.hashtags != null && ![object.hashtags isEqualToString:self.hashtags])    
        return NO;  


    return YES;
}