49 lines
No EOL
1.5 KiB
Dart
49 lines
No EOL
1.5 KiB
Dart
import 'package:angel_framework/angel_framework.dart';
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import 'angel_paginate.dart';
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export 'angel_paginate.dart';
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/// Paginates the results of service events.
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///
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/// Users can add a `page` to the query to display a certain page, i.e. `http://foo.com/api/todos?page=5`.
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///
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/// Users can also add a `$limit` to the query to display more or less items than specified in [itemsPerPage] (default: `5`).
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/// If [maxItemsPerPage] is set, then even if the query contains a `$limit` parameter, it will be limited to the maximum.
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HookedServiceEventListener paginate<T>(
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{int itemsPerPage, int maxItemsPerPage}) {
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return (HookedServiceEvent e) {
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if (e.isBefore) throw new UnsupportedError(
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'`package:angel_paginate` can only be run as an after hook.');
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if (e.result is! Iterable) return;
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int page = 0,
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nItems = itemsPerPage;
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if (e.params.containsKey('query') && e.params['query'] is Map) {
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var query = e.params['query'] as Map;
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if (query.containsKey('page')) {
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try {
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page = int.parse(query['page']?.toString());
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} catch (e) {
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// Fail silently...
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}
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}
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if (query.containsKey(r'$limit')) {
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try {
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var lim = int.parse(query[r'$limit']?.toString());
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if (lim > 0 && (maxItemsPerPage == null || lim <= maxItemsPerPage))
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nItems = lim;
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} catch (e) {
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// Fail silently...
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}
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}
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}
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var paginator = new Paginator(
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e.result, itemsPerPage: nItems)
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..goToPage(page);
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e.result = paginator.current;
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};
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} |