Vulcan/client/views/admin/toolbox.js

Template.toolbox.events= {
  'click .update-categories':function(){
    var posts=Posts.find().fetch();
    $.each(posts, function(index, element){

      if(element.categories){
        console.log('Found categories for post "'+element.headline+'"');
        $.each(element.categories)
      Posts.update(element._id,{$set:{userId:element.user_id}}, function(error){
        console.log(error);
      });

      console.log(element);
      }
    });
  },
   'click .give-invites':function(){
      Meteor.call('giveInvites');
  } 
}