流星订阅计数 [英] Meteor subscribe to a count
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问题描述
有没有什么方法可以订阅meteor中的计数.
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一个反应性会话,该会话会在计数变化时发生变化.
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()
我是这样使用的:
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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