Meteor订阅了一个计数 [英] Meteor subscribe to a count

问题描述

有没有办法订阅流星计数。

Is there any way to subscribe to a count in meteor.

我想发布 Articles.find（）。count（）而不是发布Articles.find（）。理想情况下，这应该将计数分配给在计数发生变化时会发生变化的被动会话。

I want to publish Articles.find().count() rather than publish Articles.find(). Ideally this should assign the count to a reactive Session that would change when the count changes.

推荐答案

我有以下代码来发布我的计数器

I have following code to publish my counters

Meteor.publishCounter = (params) ->
  count = 0
  init = true
  id = Random.id()
  pub = params.handle
  collection = params.collection
  handle = collection.find(params.filter, params.options).observeChanges
    added: =>
      count++
      pub.changed(params.name, id, {count: count}) unless init
    removed: =>
      count--
      pub.changed(params.name, id, {count: count}) unless init
  init = false
  pub.added params.name, id, {count: count}
  pub.ready()
  pub.onStop -> handle.stop()

我用它是这样的：

  Meteor.publish 'bikes-count', (params = {}) ->
    Meteor.publishCounter
      handle: this
      name: 'bikes-count'
      collection: Bikes
      filter: params

最后在客户端：

Meteor.subscribe 'bikes-count'
BikesCount = new Meteor.collection 'bikes-count'

Template.counter.count = -> BikesCount.findOne().count

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