101 lines
3 KiB
Dart
101 lines
3 KiB
Dart
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import 'dart:async';
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import 'dart:mirrors';
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import 'package:angel_framework/angel_framework.dart';
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import 'plural.dart' as pluralize;
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import 'no_service.dart';
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HookedServiceEventListener hasManyThrough(String servicePath, String pivotPath,
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{String as,
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String localKey,
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String pivotKey,
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String foreignKey,
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getLocalKey(obj),
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getPivotKey(obj),
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getForeignKey(obj),
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assignForeignObjects(foreign, obj)}) {
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var foreignName =
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as?.isNotEmpty == true ? as : pluralize.plural(servicePath.toString());
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return (HookedServiceEvent e) async {
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var pivotService = e.getService(pivotPath);
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var foreignService = e.getService(servicePath);
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if (pivotService == null)
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throw noService(pivotPath);
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else if (foreignService == null) throw noService(servicePath);
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_assignForeignObjects(foreign, obj) {
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if (assignForeignObjects != null)
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return assignForeignObjects(foreign, obj);
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else if (obj is Map)
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obj[foreignName] = foreign;
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else if (obj is Extensible)
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obj.properties[foreignName] = foreign;
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else
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reflect(obj).setField(new Symbol(foreignName), foreign);
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}
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_getLocalKey(obj) {
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if (getLocalKey != null)
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return getLocalKey(obj);
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else if (obj is Map)
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return obj[localKey ?? 'id'];
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else if (obj is Extensible)
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return obj.properties[localKey ?? 'id'];
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else if (localKey == null || localKey == 'id')
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return obj.id;
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else
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return reflect(obj).getField(new Symbol(localKey ?? 'id')).reflectee;
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}
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_getPivotKey(obj) {
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if (getPivotKey != null)
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return getPivotKey(obj);
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else if (obj is Map)
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return obj[pivotKey ?? 'id'];
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else if (obj is Extensible)
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return obj.properties[pivotKey ?? 'id'];
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else if (pivotKey == null || pivotKey == 'id')
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return obj.id;
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else
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return reflect(obj).getField(new Symbol(pivotKey ?? 'id')).reflectee;
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}
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_normalize(obj) async {
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// First, resolve pivot
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var id = await _getLocalKey(obj);
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var indexed = await pivotService.index({
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'query': {pivotKey ?? 'userId': id}
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});
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if (indexed == null || indexed is! List || indexed.isNotEmpty != true) {
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await _assignForeignObjects([], obj);
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} else {
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// Now, resolve from foreign service
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var mapped = await Future.wait(indexed.map((pivot) async {
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var id = await _getPivotKey(obj);
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var indexed = await foreignService.index({
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'query': {foreignKey ?? 'postId': id}
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});
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if (indexed == null ||
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indexed is! List ||
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indexed.isNotEmpty != true) {
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await _assignForeignObjects([], pivot);
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} else {
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await _assignForeignObjects(indexed, pivot);
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}
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return pivot;
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}));
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await _assignForeignObjects(mapped, obj);
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}
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}
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if (e.result is Iterable) {
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await Future.wait(e.result.map(_normalize));
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} else
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await _normalize(e.result);
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};
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}
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