"upvote". TypeError: undefined

" upvoting" Crowducate.me.

, . , , (mongo) . Heres Github.

. coffee ( mongo)//btw: :

class @Course extends Minimongoid
@_collection: new Meteor.Collection('courses') 
...
Meteor.methods({
  createCourse: ->
    userId = Meteor.userId()
    throw new Meteor.Error 403, 'Please login to create a course' unless userId
    title = 'New Course'
    course = Course.create {
    owner: userId, courseTitle: title, published: 0, upvoters: [], votes: 0, slug: slugify(title)
  }
  return course._id

  upvote: (courseId) ->
    course = Course.first({_id: courseId})
    console.log course

  #userId = Meteor.user()
    Course.update {
      _id: courseId,
      # upvoters: {$ne: user._id}
      # }, {
      # $addToSet: {upvoters: user._id}
      $inc: {votes: 1}
    } 

      

        
        
        
      

    

html

<template name="courseListItem">
  <div class="course-list-item">
    <a href="{{#if isMyCoursesPath}}{{pathFor 'courseUpdate'}}{{else}}{{pathFor 'courseShow'}}{{/if}}">
      <div class="course-img">
        {{#if courseOwner}}
        <div class="owner-options">
          <a href="{{pathFor 'courseUpdate'}}" class="btn btn-default" title="Edit Course"><i class="fa fa-edit"></i></a>
          <button class="btn btn-danger delete" title="Delete Course"><i class="fa fa-trash-o"></i></button>
        </div>
        {{/if}}
        <img class="img-resonsive" src="{{courseThumb}}">
      </div>
      <div class="well relative">
        <div class="course"><h4>{{maxChars courseTitle 40}} by {{owner}}</h4></div>
        <p class="course-list-item-preview-text">{{maxChars getText 65}}</p>
        <p class="course-list-item-preview-text-votes"><a href="#" class="btn btn-default btn-xs"><i class="upvote fa fa-thumbs-up"></i></a> <strong>{{votes}}</strong> Votes</p>
        <!-- <p class="course-list-item-preview-text">12 Votes</p> -->
        <div class="bottom">
          <p><i class="fa fa-tags" title="Tags"></i> {{maxChars getKeywords 28}}</p>
          <p><i class="fa fa-group" title="Age Group"></i> {{age}}</p>
        </div>
      </div>
    </a>
  </div>
</template>

      

        
        
        
      

    

:

'click .upvote': (evt) ->
    Etc.prevent(evt)
    Meteor.call 'upvote', this._id

      

        
        
        
      

    

, - . Coffeecode MinimongoId? , mrt install . , , ( "" ).

, P.S.: : Im CoffeeScript.