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MTLJSONAdapter *adapter = [[MTLJSONAdapter alloc] initWithModel:self.book];
NSDictionary*jsonDict = adapter.JSONDictionary;
NSData* jsonData = [NSJSONSerialization dataWithJSONObject:jsonDict options:0 error:nil];
NSString* jsonString = [[NSString alloc] initWithBytes:[jsonData bytes] length:[jsonData length] encoding:NSUTF8StringEncoding];