findOne在服务器上返回未定义

问题描述：

这是我在服务器上的代码:

Here is my code on the server:

Meteor.publish('currentRequest', function (requestId) {
        console.log('from publish');
        console.log(requestId) // The id is printed successfully
        console.log(Requests.findOne({_id: requestId})) // returns undefined
        return Requests.findOne({_id: requestId});
    });

已打印项目ID，但.findOne()似乎不起作用，因为它返回undefined.

The item ID is printed but .findOne() doesn't seem to work as it returns undefined.

我在做什么错了?

答

您的问题的答案将是:因为没有满足您的搜索查询的文档.

The answer to your question will be: because there is no document satisfying your search query.

根据文档:

按照排序和跳过选项的顺序查找与选择器匹配的第一个文档.如果找不到匹配的文档，则返回undefined.

等同于find(selector, options).fetch()[0]与options.limit = 1.

此外，正如@GaëtanRouziès指出的那样，该出版物将不起作用，因为.findOne返回document/undefined而不是光标.

Also, as it has been pointed by @GaëtanRouziès, this publication won't work, because .findOne returns document/undefined instead of cursor.

findOne在服务器上返回未定义

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