As what the title says, or even in the helpers area? I find myself needing to use a slight delay before running anything that needs to refer to data in the subscriptions, especially when it involves getting data for a Selectpicker-enabled JQuery select plugin.
You can try new Blaze subcriptions ready for instance, any way your schema would looks like
Template.Posts.rendered = ->
self = @
self.$selectElement = self.$('#my-select')
self.autorun = ->
Meteor.subscribe 'serverPosts', () ->
# do the stuff here...
self.$selectElement.selectPluginInit()
PS: coffee to js (if you prefer) gere enter link description here