我正在制作客户端服务器示例的变体,它只使用 Redstone 框架返回 JSON 字符串。它有3条路线:
/
=> 获取整个列表或名称/add/name
=> 将“名称”添加到列表并获取列表/remove/name
=> 从列表中删除“名称”并获取列表
当我在本地进行测试时,一切正常,但是,当我部署到 App Engine 时,尝试将元素添加到 gcloud db 时出现错误。错误是
例外:尝试插入 1 个实体,但响应似乎表明我们插入了 0 个实体。包:appengine/src/api_impl/raw_datastore_v3_impl.dart 416:11 DatastoreV3RpcImpl.commit。飞镖:隔离_RawReceivePortImpl._handleMessage
您可以在此 URL http://web3.arista-dev.appspot.com/add/my-name上实时测试错误
删除似乎也不起作用,但不会产生错误。这是我的代码:
import 'dart:io';
import 'dart:async';
import 'package:shelf/shelf.dart' as shelf;
import 'package:redstone/server.dart' as app;
import 'package:restonetest/model.dart';
import 'package:gcloud/db.dart';
import 'package:appengine/appengine.dart';
Key get itemsRoot => context.services.db.emptyKey.append (ItemRoot, id: 1);
DatastoreDB db = context.services.db;
Future<List<Item>> queryItems ()
{
var query = context.services.db.query (Item, ancestorKey: itemsRoot)
..order ('name');
return query.run ().toList ();
}
Future<List<Item>> addItemToDB (Item item)
{
return db.query(Item, ancestorKey: itemsRoot).run()
.any((i) => i.name == item.name)
.then((exists)
{
return ! exists ? db.commit(inserts: [item]) : false;
});
}
@app.Route("/")
helloWorld() => queryItems();
@app.Route('/add/:name')
addItem (String name)
{
return addItemToDB (new Item.create (name, itemsRoot)).then ((_)
{
print (name);
return helloWorld();
});
}
@app.Route('/delete/:name')
deleteItem (String name)
{
var query = db.query (Item, ancestorKey: itemsRoot)..filter('name =', name);
return query.run().toList().then((list)
{
var toDelete = list.map((i) => i.key).toList();
return db.commit(deletes: toDelete);
})
.then((_) => helloWorld());
}
main() {
app.setupConsoleLog();
app.setUp();
runAppEngine(app.handleRequest);
//app.start();
}