Minimum reproducible code:
// foo.dart
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:cloud_firestore_odm/cloud_firestore_odm.dart';
import 'package:json_annotation/json_annotation.dart';
part 'foo.g.dart';
@JsonSerializable(
createFieldMap: true,
createPerFieldToJson: true,
)
class Foo extends Bar {
final int age;
Foo(this.age) : super(category: 'c');
}
abstract class Bar {
final String category;
Bar({required this.category});
}
@Collection<Foo>('foo')
final fooRef = FooCollectionReference();
Running dart run build_runner build -d, will generate foo.g.dart with errors in the following method:
// foo.g.dart
...
@override
FooQuery whereCategory({
Object? isEqualTo = _sentinel,
...
}) {
return _$FooQuery(
_collection,
$referenceWithoutCursor: $referenceWithoutCursor.where(
_$FooFieldMap['category']!,
isEqualTo: isEqualTo != _sentinel
? _$FooPerFieldToJson.category(isEqualTo as String) // <-- Error
: null,
...
),
$queryCursor: $queryCursor,
);
}
...
Problem:
The error occurs because the generated _$FooPerFieldToJson doesn’t have the category field, it only has the age field.
// foo.g.dart
abstract class _$FooPerFieldToJson {
// ignore: unused_element
static Object? age(int instance) => instance;
}
How can I generate the category field?
1
You can add these constructor: toJson and fromJson
and i think the problem is you define the category value on your super in Foo. check my code below: i have String name on Foo constructor and pass the value to super class which is Bar
fromJson toJson constructor are requred to generate json to class conversion
import 'package:json_annotation/json_annotation.dart';
part 'foo_bar.g.dart';
@JsonSerializable()
class Foo extends Bar {
Foo({
required this.age,
required String name,
}) : super(name);
factory Foo.fromJson(Map<String, dynamic> json) => _$FooFromJson(json);
Map<String, dynamic> toJson() => _$FooToJson(this);
String? age;
}
class Bar {
Bar(this.name);
final String name;
}
then run generation: flutter pub run build_runner build --delete-conflicting-outputs
drop a comment if i missed something