HospitalWard.fromJson constructor
Creates a HospitalWard instance from a JSON map.
Handles potential null values by providing default values if necessary.
Implementation
factory HospitalWard.fromJson(Map<String, dynamic> json) {
return HospitalWard(
id: json['id'],
name: json['name'],
block: json['block'],
floor: json['floor'],
hospitalId: json['hospital_id'].toString(),
);
}