Meteor:deps.autorun中的collection.find().fetch()失败

Question

我想在流星服务器上创建一个反应式集合查询,并在发生更改时处理结果.

这是我的代码:

if (Meteor.isServer) {
  Meteor.startup(function(){
    Deps.autorun(function(){
      var items=new Meteor.Collection('name').find().fetch();
      // ... process the items ...
    });
  });
}

(实际上,对于此测试,整个项目仅包含一个.js文件中的上述代码).启动此程序时meteor会抛出错误:

/home/yaakov/Bug/.meteor/local/build/programs/server/boot.js:198
}).run();
   ^
Error: Can't call yield in a noYieldsAllowed block!
    at Function.Fiber.yield (packages/meteor/fiber_helpers.js:11)
    at Function.wait (home/yaakov/.meteor/tools/cef2bcd356/lib/node_modules/fibers/future.js:111:14)
    at Object.Future.wait (/home/yaakov/.meteor/tools/cef2bcd356/lib/node_modules/fibers/future.js:325:10)
    at new MongoConnection (packages/mongo-livedata/mongo_driver.js:196)
    at new MongoInternals.RemoteCollectionDriver (packages/mongo-livedata/remote_collection_driver.js:4)
    at Object.<anonymous> (packages/mongo-livedata/remote_collection_driver.js:44)
    at Object.defaultRemoteCollectionDriver (packages/underscore/underscore.js:750)
    at new Meteor.Collection (packages/mongo-livedata/collection.js:72)
    at app/Bug.js:4:17
    at packages/deps/deps.js:47

我做错了什么？如何在流星服务器上创建响应式收集查询？

Answer 1

该Deps程序包仅适用于客户端,因此您无法Deps.autorun在服务器上使用.

要在服务器上使用类似反应的查询,请使用observe:

var items=collection.find().observe({
    added: function (document) {
        // ...
    },
    changed: function (newDocument, oldDocument) {
        // ...
    },
    removed: function (oldDocument) {
        // ...
    }
});