在Flutter中实现Algolia搜索

Question

我正试图实现与过滤器扑动algalia搜索。我在algolia网站上找到了一篇文章，我遵循了tee来实现这个阶段，但我得到了这个错误，不知道该怎么做:

lib/services/search.dart:194:52: Error: Member not found: 'fromResponse'.
_assetsSearcher.responses.map(SearchMetadata.fromResponse);
^^^^^^^^^^^^
lib/services/search.dart:200:46: Error: Member not found: 'fromResponse'.
_assetsSearcher.responses.map(HitsPage.fromResponse);
^^^^^^^^^^^^

这是我的代码:

class SearchMetadata {
final int nbHits;
const SearchMetadata(this.nbHits);
factory SearchMetadata.fromResponse(SearchResponse response) =>
SearchMetadata(response.nbHits);
}
class Asset {
final String code;
final String name;
final String desc;
final String loc;
final String img;
Asset(this.code, this.name, this.desc, this.loc, this.img);
static Asset fromJson(Map<String, dynamic> json) {
return Asset(
json['name'], json['desc'], json['desc'], json['loc'], json['img']);
}
}
class HitsPage {
const HitsPage(this.assets, this.pageKey, this.nextPageKey);
final List<Asset> assets;
final int pageKey;
final int? nextPageKey;
factory HitsPage.fromResponse(SearchResponse response) {
final assets = response.hits.map(Asset.fromJson).toList();
final isLastPage = response.page >= response.nbPages;
final nextPageKey = isLastPage ? null : response.page + 1;
return HitsPage(assets, response.page, nextPageKey);
}
}
class AlgoliaSearchFilters extends StatefulWidget {
const AlgoliaSearchFilters({Key? key, required this.title}) : super(key: key);
final String title;
@override
State<AlgoliaSearchFilters> createState() => _AlgoliaSearchFiltersState();
}
class _AlgoliaSearchFiltersState extends State<AlgoliaSearchFilters> {
final _searchTextController = TextEditingController();
final _assetsSearcher = HitsSearcher(
applicationID: 'OPN6AROJK6',
apiKey: '0ba458475d25b7e2069d700c32e42f29',
indexName: 'asset');
Stream<SearchMetadata> get _searchMetadata =>
_assetsSearcher.responses.map(SearchMetadata.fromResponse);
final PagingController<int, Asset> _pagingController =
PagingController(firstPageKey: 0);
Stream<HitsPage> get _searchPage =>
_assetsSearcher.responses.map(HitsPage.fromResponse);
final GlobalKey<ScaffoldState> _mainScaffoldKey = GlobalKey();
final _filterState = FilterState();
late final _facetList = FacetList(
searcher: _assetsSearcher, filterState: _filterState, attribute: 'loc');
@override
void initState() {
super.initState();
_searchTextController
.addListener(() => _assetsSearcher.query(_searchTextController.text));
_searchPage.listen((page) {
if (page.pageKey == 0) {
_pagingController.refresh();
}
_pagingController.appendPage(page.assets, page.nextPageKey);
}).onError((error) => _pagingController.error = error);
_pagingController.addPageRequestListener((pageKey) =>
_assetsSearcher.applyState((state) => state.copyWith(page: pageKey)));
_assetsSearcher.connectFilterState(_filterState);
_filterState.filters.listen((_) => _pagingController.refresh());
}
@override
Widget build(BuildContext context) {
return Scaffold(
key: _mainScaffoldKey,
appBar: AppBar(
backgroundColor: Colors.blue[900],
title: const Text("Algolia Flutter Search"),
actions: [
IconButton(
onPressed: () => _mainScaffoldKey.currentState?.openEndDrawer(),
icon: const Icon(Icons.filter_list_sharp))
],
),
endDrawer: Drawer(
child: _filters(context),
),
body: Center(
child: Column(
children: <Widget>[
SizedBox(
height: 44,
child: TextField(
controller: _searchTextController,
decoration: const InputDecoration(
border: InputBorder.none,
hintText: 'Enter a search term',
prefixIcon: Icon(Icons.search),
),
)),
StreamBuilder<SearchMetadata>(
stream: _searchMetadata,
builder: (context, snapshot) {
if (!snapshot.hasData) {
return const SizedBox.shrink();
}
return Padding(
padding: const EdgeInsets.all(8.0),
child: Text('${snapshot.data!.nbHits} hits'),
);
},
),
Expanded(
child: _hits(context),
)
],
),
),
);
}
Widget _hits(BuildContext context) => PagedListView<int, Asset>(
pagingController: _pagingController,
builderDelegate: PagedChildBuilderDelegate<Asset>(
noItemsFoundIndicatorBuilder: (_) => const Center(
child: Text('No results found'),
),
itemBuilder: (_, item, __) => Container(
color: Colors.white,
height: 80,
padding: const EdgeInsets.all(8.0),
child: Row(
children: [
SizedBox(width: 50, child: Image.network(item.img)),
const SizedBox(width: 20),
Expanded(child: Text(item.name))
],
),
)));
Widget _filters(BuildContext context) => Scaffold(
appBar: AppBar(
backgroundColor: Colors.blue[900],
title: const Text('Filters'),
),
body: StreamBuilder<List<SelectableItem<Facet>>>(
stream: _facetList.facets,
builder: (context, snapshot) {
if (!snapshot.hasData) {
return const SizedBox.shrink();
}
final selectableFacets = snapshot.data!;
return ListView.builder(
padding: const EdgeInsets.all(8.0),
itemCount: selectableFacets.length,
itemBuilder: (_, index) {
final selectableFacet = selectableFacets[index];
return CheckboxListTile(
value: selectableFacet.isSelected,
title: Text(
'${selectableFacet.item.value} (${selectableFacet.item.count})'),
onChanged: (_) {
_facetList.toggle(selectableFacet.item.value);
},
);
});
}),
);
@override
void dispose() {
_searchTextController.dispose();
_assetsSearcher.dispose();
_pagingController.dispose();
_filterState.dispose();
_facetList.dispose();
super.dispose();
}
}

只有在我运行程序时才显示为错误请让我知道任何修复谢谢!

Answer 1

我在更新flutter后遇到了同样的问题。尝试运行

flutter pub upgrade 

升级所有依赖项，因为这是由传递依赖项引起的。