如何强制 Meteor 重新加载订阅? [英] How to force Meteor to reload subscriptions?

问题描述

在我的应用程序中，sections 是通过名为 course.sectionIds 的属性链接到 courses 的集合.初始加载工作正常，但在管理面板中添加部分时遇到了非反应性加入问题.

In my application, sections is a collection linked to courses by a property called course.sectionIds. The initial load works fine, but I am running into a non-reactive join problem when adding a section in the admin panel.

路线如下:

@route 'adminCourse',
    path: 'admin/course/:course'
    waitOn: -> Meteor.subscribe 'course', @params.course
    data: -> Course.first()

并且这些部分包含在课程出版物中:

And the sections are included in the course publication:

Meteor.publish 'course', ( courseId ) ->
    return null if not this.userId

    # [some permission checks]

    courses = Course.find courseId
    sections = Section.find _id: $in: _.flatten courses.map ( course ) -> course.sectionIds

    [ courses, sections ]

我知道反应式连接，但我不能真正使用方法 #1 或 #4(在客户端上过度发布和加入)，因为涉及权限检查(您应该只能看到自己课程的部分).此外，我知道数据何时发生变化，因此它实际上不必是被动的.

I know about reactive joins, but I can't really use approach #1 or #4 (overpublishing and joining on the client), as there are permission checks involved (you should only be able to see the sections of your own courses). Also, I know when the data changes, so it doesn't really have to be reactive.

我只想让 Meteor 知道在用户提交表单以添加新部分时重新加载数据(我目前正在通过执行 window.location.reload()添加部分后).有没有办法用 Meteor 做到这一点?

I just want to let Meteor know to reload the data, when the user submits the form for adding a new section (I am currently working around this by doing a window.location.reload() after a section has been added). Is there a way to do that with Meteor?

推荐答案

原来这真的很简单，现在我觉得有点傻:)

Turns out this was really simple, and I feel a little stupid now :)

您只需再次调用 Meteor.subscribe() 即可重新加载订阅.我在使用不同的解决方案时发现了这一点，使用铁路由器导航到不同的 URL 使其重新加载订阅.

You can reload the subscription by simply calling Meteor.subscribe() again. I found this out while messing with a different solution, using iron router to navigate to a different URL making it reload the subscription.

因此，在我的提交侦听器中，您可以简单地执行以下操作，而不是执行 window.reload():

So, in my submit listener, instead of doing window.reload(), you can simply do the following:

Template.sectionForm.events
    'submit form': ( e ) ->
        e.preventDefault()
        data = SimpleForm.processForm( event.target )

        section = Section.create( data )
        this.course.push( sectionIds: section._id )

        # Reload the subscription to pull in the new section
        params = Router.current().params
        Meteor.subscribe 'course', params.producer, params.course

它会拉入新数据.耶！

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