问题描述
我正在尝试在MongoDB查询的流星会话中将正则表达式另存为RegExp对象，但是在Session.get()之后，RegExp对象只是一个空对象.
I'm trying to save a regular expression as RegExp Object in a Meteor Session for a MongoDB query, but after Session.get() the RegExp object is just a empty object.
js
if (Meteor.isClient) {
Meteor.startup(function () {
var obj = {};
obj['regexp'] = new RegExp("test");
console.log("setting regular expression: " + obj['regexp']);
Session.set("test", obj);
});
Template.test.events({
'click button': function () {
var regex = Session.get("test");
console.log("now it is: ");
console.log(regex['regexp']);
}
});
}
if (Meteor.isServer) {
}
html
<head>
<title>meteor-regexp-session-test</title>
</head>
<body>
{{> test}}
</body>
<template name="test">
<button>hit the button and look at the console</button>
</template>
有什么想法为什么不起作用?
Any ideas why this is not working?
提前谢谢！
推荐答案
Session软件包在内部使用了ReactiveDict.
Session package uses ReactiveDict under the hood.
ReactiveDict序列化传递给Sessions.set(key, value)的值:
// https://github.com/meteor/meteor/blob/devel/packages/reactive-dict/reactive-dict.js
// line 3-7:
var stringify = function (value) {
if (value === undefined)
return 'undefined';
return EJSON.stringify(value);
};
Session.get(key)用EJSON.parse反序列化:
// https://github.com/meteor/meteor/blob/devel/packages/reactive-dict/reactive-dict.js
// line 8-12:
var parse = function (serialized) {
if (serialized === undefined || serialized === 'undefined')
return undefined;
return EJSON.parse(serialized);
};
这意味着Session不支持RegExp.
您的问题的解决方案是创建自定义反应式数据源，该源将与Session相似，但不会序列化/反序列化值对象.
The solution for your issue is to create custom reactive data source, which will work similar to Session but will not serialize/deserialize value object.
在这里看看:
- http://blog.benmcmahen.com/post/48367809759/meteors-reactive-data-sources
- https://www.eventedmind.com/feed/meteor-build-a-reactive-data-source
这篇关于流星:将RegExp对象保存到会话的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！