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Add service.map

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This commit is contained in:
Tobe O 2018-10-22 12:18:10 -04:00
parent 8ef86f61a3
commit 82b32318e8
2 changed files with 34 additions and 6 deletions
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12
lib/src/core/anonymous_service.dart
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@ -12,12 +12,12 @@ class AnonymousService<Id, Data> extends Service<Id, Data> {
FutureOr<Data> Function(Id, Data, [Map<String, dynamic>]) _modify, _update;
AnonymousService(
{FutureOr<List<Data>> index([Map params]),
FutureOr<Data> read(Id id, [Map params]),
FutureOr<Data> create(Data data, [Map params]),
FutureOr<Data> modify(Id id, Data data, [Map params]),
FutureOr<Data> update(Id id, Data data, [Map params]),
FutureOr<Data> remove(Id id, [Map params])})
{FutureOr<List<Data>> index([Map<String, dynamic> params]),
FutureOr<Data> read(Id id, [Map<String, dynamic> params]),
FutureOr<Data> create(Data data, [Map<String, dynamic> params]),
FutureOr<Data> modify(Id id, Data data, [Map<String, dynamic> params]),
FutureOr<Data> update(Id id, Data data, [Map<String, dynamic> params]),
FutureOr<Data> remove(Id id, [Map<String, dynamic> params])})
: super() {
_index = index;
_read = read;

28
lib/src/core/service.dart
View file

@ -6,6 +6,7 @@ import 'package:angel_http_exception/angel_http_exception.dart';
import 'package:merge_map/merge_map.dart';
import '../util.dart';
import 'anonymous_service.dart';
import 'hooked_service.dart' show HookedService;
import 'metadata.dart';
import 'response_context.dart';
@ -124,6 +125,33 @@ class Service<Id, Data> extends Routable {
throw new AngelHttpException.methodNotAllowed();
}
/// Creates an [AnonymousService] that wraps over this one, and maps input and output
/// using two converter functions.
///
/// Handy utility for handling data in a type-safe manner.
Service<Id, U> map<U>(U Function(Data) encoder, Data Function(U) decoder) {
return new AnonymousService<Id, U>(
index: ([params]) {
return index(params).then((it) => it.map(encoder).toList());
},
read: (id, [params]) {
return read(id, params).then(encoder);
},
create: (data, [params]) {
return create(decoder(data), params).then(encoder);
},
modify: (id, data, [params]) {
return modify(id, decoder(data), params).then(encoder);
},
update: (id, data, [params]) {
return update(id, decoder(data), params).then(encoder);
},
remove: (id, [params]) {
return remove(id, params).then(encoder);
},
);
}
/// Transforms an [id] (whether it is a String, num, etc.) into one acceptable by a service.
///
/// The single type argument, [T], is used to determine how to parse the [id].