toMap method
Converts this BaseModel into a Serializable Map.
Can be coverted back into the Class version by calling loadFromMap
Implementation
@override
Map<String, dynamic> toMap() {
final map = <String, dynamic>{};
map[TYPE] = type;
getterSetterMap.keys
.forEach((element) => map[element] = getterSetterMap[element]!.item1());
return map;
}