toMap method
Implementation
Map<String, dynamic> toMap() {
Map<String, dynamic> map = {};
if (name != null) {
map['name'] = name;
}
if (email != null) {
map['email'] = email;
}
if (password != null) {
map['password'] = password;
}
if (username != null) {
map['username'] = username;
}
return map;
}