Comments (5)
QueryStream
extends Stream
so you can already asyncMap on it. But yeah some kind of function like mapTo(collector, mapper)
would be useful as you could reuse the same collector everywhere.
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Thanks somehow missed that
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Planning on adding a collector interface, you can use it with BuiltList
like so:
class BuiltListCollector<T>
implements Collector<T, ListBuilder<T>, BuiltList<T>> {
const BuiltListCollector();
@override
ListBuilder<T> supply(int length) => ListBuilder();
@override
void add(ListBuilder<T> accumulator, int index, T element) {
accumulator.add(element);
}
@override
BuiltList<T> finish(ListBuilder<T> accumulator) => accumulator.build();
}
streamDb.createQuery("MyTable", where: 'name LIKE ?', whereArgs: [query])
.mapTo(BuiltListCollector(), (row) => MyEntry(row));
Thoughts?
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Neat! Maybe you could also solve this by passing in a fold function instead of a map function then the client doesn't need the collector interface and you can fold into a list, BuiltList builder or single value.
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Now that dart has extension methods, don't think something like this is very useful, you can do:
extension BuiltListExtension on Stream<LazyQuery> {
Stream<BuiltList<T>> mapToBuiltList<T>(T mapper(Map<String, dynamic> row)) {
return this.asyncMap((query) => query()).map((rows) {
var result = BuiltList<T>().toBuilder();
for (final row in rows) {
result.add(mapper(row));
}
return result.build();
});
}
}
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