Fixes for courses, hoc

* Handling prepaids with strings for maxRedeemers
* Add link to TeacherCoursesView from HourOfCodeView
* Show only course instances with classrooms attached in TeacherCoursesView and StudentCoursesView
* Add event tracking to HourOfCodeView
* Add not-logged-in handling to TeacherCoursesView
* Fixed a GET prepaids bug
* Have course instances created for hour of code have hourOfCode property set to true.

app/models/Prepaid.coffee

@@ -12,3 +12,9 @@ module.exports = class Prepaid extends CocoModel
     for redeemer in @get('redeemers')
       return redeemer.date if redeemer.userID is userID
     return null
+    
+  initialize: ->
+    @listenTo @, 'add', ->
+      maxRedeemers = @get('maxRedeemers')
+      if _.isString(maxRedeemers)
+        @set 'maxRedeemers', parseInt(maxRedeemers)

app/templates/courses/hour-of-code-view.jade

@@ -8,4 +8,4 @@ block content
       .col-md-6.text-center
         button#student-btn.btn.btn-lg.btn-success(data-i18n="courses.students_click")
       .col-md-6.text-center
-        button#teacher-btn.btn.btn-lg.btn-default(data-i18n="courses.teachers_click")
+        a.btn.btn-lg.btn-default(data-i18n="courses.teachers_click", href="/courses/teachers?hoc=true")

app/templates/courses/student-courses-view.jade

@@ -27,12 +27,19 @@ block content
       
     .list-group
       for courseInstance in view.courseInstances.models
+        - var classroom = view.classrooms.get(courseInstance.get('classroomID'))
+        - var course = view.courses.get(courseInstance.get('courseID'))
+        if !(classroom && course)
+          - continue;
+
         .list-group-item
           .row
-            - var classroom = view.classrooms.get(courseInstance.get('classroomID'))
+            .col-sm-3
-            - var course = view.courses.get(courseInstance.get('courseID'))
+              if classroom
-            .col-sm-3= classroom.get('name')
+                | #{classroom.get('name')}
-            .col-sm-3= course.get('name')
+            .col-sm-3
+              if course
+                | #{course.get('name')}
             .col-sm-6
               a.btn.btn-default.btn-sm(href="/courses/#{course.id}/#{courseInstance.id}") Enter
         

app/templates/courses/teacher-courses-view.jade

@@ -2,21 +2,48 @@ extends /templates/base
 
 block content
 
-  span *UNDER CONSTRUCTION, please send feedback to
+  if view.hoc
-  a.spl(href='mailto:team@codecombat.com') team@codecombat.com
+    h1 Welcome to Hour of Code!
-  hr
+    
+    p
+      | Thank you for choosing CodeCombat for your students.
+      span.spr.spl To get your kids started, simply send them to
+      a(href="/hoc") https://codecombat.com/hoc
+      span .
+    
+    p
+      | If you'd like to use our courses system to view their progress:
+    
+    ol
+      li Login/create your account if you have not already.
+      li Create a classroom on this page.
+      li Invite your students to the classroom.
+      
+    p
+      | You can invite your students even if they've already started playing CodeCombat.
+      
+    p
+      span.spr If you have any problems, please email
+      a(href="mailto:team@codecombat.com") team@codecombat.com
+      span .
   
-  ul.nav.nav-tabs(role='tablist')
+  if !me.isAnonymous()
-    li.active(role='presentation')
+    ul.nav.nav-tabs(role='tablist')
-      a(href="#courses-tab-pane" aria-controls="courses" role="tab" data-toggle="tab") Courses
+      li.active(role='presentation')
-    li(role='presentation')
+        a(href="#courses-tab-pane" aria-controls="courses" role="tab" data-toggle="tab") Courses
-      a(href="#manage-tab-pane" aria-controls="manage" role="tab" data-toggle="tab") Manage
+      li(role='presentation')
+        a(href="#manage-tab-pane" aria-controls="manage" role="tab" data-toggle="tab") Manage
     
   .tab-content
     #courses-tab-pane.tab-pane.well.active
       h3 Your Courses
       - var courseInstances = view.courseInstances.sliceWithMembers();
-      if !_.size(courseInstances)
+      
+      if me.isAnonymous()
+        .alert.alert-info
+          strong Please click "Create Account" or "Log In" above to view and manage your courses.
+
+      else if !_.size(courseInstances)
         .alert.alert-info
           span.spr You currently have no students assigned to courses.
           a#manage-tab-link Go to the manage tab to get set up.
@@ -35,8 +62,9 @@ block content
                 if classroom
                   | #{classroom.get('name')}
               td
-                if courseInstance.course
+                - var course = view.courses.get(courseInstance.get('courseID'))
-                  | #{courseInstance.course.get('name')}
+                if course
+                  | #{course.get('name')}
               td= _.size(courseInstance.get('members'))
               td
                 a.btn.btn-primary.btn-sm(href='/courses/#{courseInstance.get("courseID")}/#{courseInstance.id}') Enter

app/views/courses/HourOfCodeView.coffee

@@ -42,34 +42,8 @@ module.exports = class HourOfCodeView extends RootView
       url: '/db/course_instance/-/create-for-hoc'
       context: @
       success: (data) ->
+        application.tracker?.trackEvent 'Finished HoC student course creation', {courseID: data.courseID}
         app.router.navigate("/courses/#{data.courseID}/#{data._id}", {
           trigger: true
         })
-    })
+    })
-
-#    jqxhr = $.post()
-#    jqxhr.done (data, textStatus, jqXHR) =>
-#      application.tracker?.trackEvent 'Finished HoC student course creation', {courseID: courseID}
-#      # TODO: handle fetch errors
-#      me.fetch(cache: false).always =>
-#        courseID = courseID
-#        route = "/courses/#{courseID}"
-#        viewArgs = [{}, courseID]
-#        if data?.length > 0
-#          courseInstanceID = data[0]._id
-#          route += "/#{courseInstanceID}"
-#          viewArgs[0].courseInstanceID = courseInstanceID
-#        Backbone.Mediator.publish 'router:navigate',
-#          route: route
-#          viewClass: 'views/courses/CourseDetailsView'
-#          viewArgs: viewArgs
-#    jqxhr.fail (xhr, textStatus, errorThrown) =>
-#      console.error 'Got an error purchasing a course:', textStatus, errorThrown
-#      application.tracker?.trackEvent 'Failed HoC student course creation', status: textStatus
-#      if xhr.status is 402
-#        @state = 'declined'
-#        @stateMessage = arguments[2]
-#      else
-#        @state = 'unknown_error'
-#        @stateMessage = "#{xhr.status}: #{xhr.responseText}"
-#      @render?()

app/views/courses/TeacherCoursesView.coffee

@@ -33,7 +33,7 @@ module.exports = class TeacherCoursesView extends RootView
     @supermodel.loadCollection(@classrooms, 'classrooms', {data: {ownerID: me.id}})
     @courseInstances = new CocoCollection([], { url: "/db/course_instance", model: CourseInstance })
     @courseInstances.comparator = 'courseID'
-    @courseInstances.sliceWithMembers = -> return @filter (courseInstance) -> _.size(courseInstance.get('members'))
+    @courseInstances.sliceWithMembers = -> return @filter (courseInstance) -> _.size(courseInstance.get('members')) and courseInstance.get('classroomID')
     @supermodel.loadCollection(@courseInstances, 'course_instances', {data: {ownerID: me.id}})
     @members = new CocoCollection([], { model: User })
     @prepaids = new CocoCollection([], { url: "/db/prepaid", model: Prepaid })
@@ -44,6 +44,7 @@ module.exports = class TeacherCoursesView extends RootView
     @supermodel.loadCollection(@prepaids, 'prepaids', {data: {creator: me.id}})
     @listenTo @members, 'sync', @renderManageTab
     @usersToRedeem = new CocoCollection([], { model: User })
+    @hoc = utils.getQueryVariable('hoc')
     @
 
   onceClassroomsSync: ->

server/courses/course_instance_handler.coffee

@@ -55,6 +55,7 @@ CourseInstanceHandler = class CourseInstanceHandler extends Handler
         name: 'Single Player'
         ownerID: req.user.get('_id')
         aceConfig: { language: 'python' }
+        hourOfCode: true
       })
       courseInstance.save (err, courseInstance) =>
         return @sendDatabaseError(res, err) if err

server/prepaids/prepaid_handler.coffee

@@ -239,7 +239,7 @@ PrepaidHandler = class PrepaidHandler extends Handler
       return @sendBadInputError(res, 'Bad creator') unless utils.isID creator
       Prepaid.find {creator: mongoose.Types.ObjectId(creator)}, (err, prepaids) =>
         return @sendDatabaseError(res, err) if err
-        return @sendSuccess(res, (@formatEntity(req, prepaids) for prepaids in prepaids))
+        return @sendSuccess(res, (@formatEntity(req, prepaid) for prepaid in prepaids))
     else
       super(arguments...)