Question 242395 in Flutter Question posted in
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Flutter – How to convert a String from Firestore to a Enum?

I get a snapshot from Firestore like this:

return userCollection
    .doc(uid)
    .collection('values')
    .where(
      "created",
      isGreaterThanOrEqualTo: fromDate,
      isLessThan: toDate,
    )
    .orderBy('created', descending: true)
    .snapshots()
    .map((list) =>
        list.docs.map((doc) => Values.fromSnapshot(doc)).toList());

then I convert it to a Values Model:

  Values.fromSnapshot(DocumentSnapshot<Map<String, dynamic>> snapshot)
      : created = snapshot.data()!['created'],
        type = snapshot.data()!['type'],
        value = snapshot.data()!['value'].toDouble();

The "type" is a String. How can I convert it to a specific ValuesType Enum?

enum ValueType { first, second, third }

The String has not the same name: For example "one", "two", "three".
How is the right way to do this?

Tags:

2

Answers


  1. 0

    You could change your enum to this for example

    enum ValueType {
  first,
  second,
  third;

  static ValueType fromString(String s) => switch (s) {
        "one" => first,
        "two" => second,
        "three" => third,
        _ => first
      };
}

    And then use it as

        type = ValueType.fromString(snapshot.data()!['type']),
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  2. 0

    I’d go for the following method:

    enum Foo {
  bar,
  baz,
}

final myEnumString = 'bar';
final myEnumValue = Foo.values.byName(myEnumString);

    This won’t require any extra methods to be written or updated as enums change.

    In your case this would be:

    final type = ValueType.values.byName(snapshot.data()!['type']);
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