Add /courses prepaid code query var

Update invite students link to go to /courses

app/templates/courses/course-details.jade

@@ -250,7 +250,7 @@ mixin invite-tab
   h3(data-i18n="courses.invite_link_header")
   p(data-i18n="courses.invite_link_p_1")
   .alert.alert-info
-    strong= document.location.origin + "/account/prepaid?_ppc=" + view.prepaid.get('code')
+    strong= document.location.origin + "/courses?_ppc=" + view.prepaid.get('code')
   p(data-i18n="courses.invite_link_p_2")
   .form
     .form-group

app/templates/courses/courses.jade

@@ -7,19 +7,25 @@ block content
     a.spl(href='mailto:team@codecombat.com') team@codecombat.com
 
   br
-  if studentMode
-    +student-main
+  if state === 'enrolling'
+    .alert.alert-info Enrolling in course..
   else
-    +teacher-main
-  .container-fluid
-    - var i = 0
-    while i < courses.length
-      .row
-        +course-block(courses[i], instances)
-        - i++
-        if i < courses.length
+    if state === 'unknown_error'
+      .alert.alert-danger.alert-dismissible= stateMessage
+
+    if studentMode
+      +student-main
+    else
+      +teacher-main
+    .container-fluid
+      - var i = 0
+      while i < courses.length
+        .row
           +course-block(courses[i], instances)
           - i++
+          if i < courses.length
+            +course-block(courses[i], instances)
+            - i++
 
 mixin student-main
   button.btn.btn-warning.btn-teacher(data-i18n="courses.teachers_click")

app/views/courses/CoursesView.coffee

@@ -26,6 +26,7 @@ module.exports = class CoursesView extends RootView
     @courseInstances = new CocoCollection([], { url: "/db/user/#{me.id}/course_instances", model: CourseInstance})
     @listenToOnce @courseInstances, 'sync', @onCourseInstancesLoaded
     @supermodel.loadCollection(@courseInstances, 'course_instances')
+    @courseEnroll(prepaidCode) if prepaidCode = utils.getQueryVariable('_ppc', false)
 
   getRenderData: ->
     context = super()
@@ -33,6 +34,8 @@ module.exports = class CoursesView extends RootView
     context.enrolledCourses = @enrolledCourses ? {}
     context.instances = @courseInstances.models ? []
     context.praise = @praise
+    context.state = @state
+    context.stateMessage = @stateMessage
     context.studentMode = @studentMode
     context
 
@@ -73,24 +76,7 @@ module.exports = class CoursesView extends RootView
     $('.continue-dialog').modal('hide')
     courseID = $(e.target).data('course-id')
     prepaidCode = $(".code-input[data-course-id=#{courseID}]").val()
-    data = prepaidCode: prepaidCode
-    jqxhr = $.post('/db/course_instance/-/redeem_prepaid', data)
-    jqxhr.done (data, textStatus, jqXHR) =>
-      application.tracker?.trackEvent 'Redeemed course prepaid code', {courseID: courseID, prepaidCode: prepaidCode}
-      # TODO: handle fetch errors
-      me.fetch(cache: false).always =>
-        route = "/courses/#{courseID}"
-        viewArgs = [{}, courseID]
-        Backbone.Mediator.publish 'router:navigate',
-          route: route
-          viewClass: 'views/courses/CourseDetailsView'
-          viewArgs: viewArgs
-    jqxhr.fail (xhr, textStatus, errorThrown) =>
-      console.error 'Got an error redeeming a course prepaid code:', textStatus, errorThrown
-      application.tracker?.trackEvent 'Failed to redeem course prepaid code', status: textStatus
-      @state = 'unknown_error'
-      @stateMessage = "#{xhr.status}: #{xhr.responseText}"
-      @render?()
+    @courseEnroll(prepaidCode)
 
   onClickEnter: (e) ->
     $('.continue-dialog').modal('hide')
@@ -115,3 +101,32 @@ module.exports = class CoursesView extends RootView
     viewArgs = [studentMode: false]
     navigationEvent = route: route, viewClass: viewClass, viewArgs: viewArgs
     Backbone.Mediator.publish 'router:navigate', navigationEvent
+
+  courseEnroll: (prepaidCode) ->
+    @state = 'enrolling'
+    @render?()
+    data = prepaidCode: prepaidCode
+    jqxhr = $.post('/db/course_instance/-/redeem_prepaid', data)
+    jqxhr.done (data, textStatus, jqXHR) =>
+      application.tracker?.trackEvent 'Redeemed course prepaid code', {prepaidCode: prepaidCode}
+      # TODO: handle fetch errors
+      me.fetch(cache: false).always =>
+        if data?.length > 0 && data[0].courseID && data[0]._id
+          courseID = data[0].courseID
+          courseInstanceID = data[0]._id
+          route = "/courses/#{courseID}/#{courseInstanceID}"
+          viewArgs = [{}, courseID, courseInstanceID]
+          Backbone.Mediator.publish 'router:navigate',
+            route: route
+            viewClass: 'views/courses/CourseDetailsView'
+            viewArgs: viewArgs
+        else
+          @state = 'unknown_error'
+          @stateMessage = "Database error."
+          @render?()
+    jqxhr.fail (xhr, textStatus, errorThrown) =>
+      console.error 'Got an error redeeming a course prepaid code:', textStatus, errorThrown
+      application.tracker?.trackEvent 'Failed to redeem course prepaid code', status: textStatus
+      @state = 'unknown_error'
+      @stateMessage = "#{xhr.status}: #{xhr.responseText}"
+      @render?()

server/courses/course_instance_handler.coffee

@@ -123,7 +123,7 @@ CourseInstanceHandler = class CourseInstanceHandler extends Handler
               address: email
             email_data:
               class_name: courseInstance.get('name')
-              join_link: "https://codecombat.com/account/prepaid?_ppc=" + prepaid.get('code')
+              join_link: "https://codecombat.com/courses?_ppc=" + prepaid.get('code')
           sendwithus.api.send context, _.noop
         return @sendSuccess(res, {})
 
@@ -160,6 +160,6 @@ CourseInstanceHandler = class CourseInstanceHandler extends Handler
           tasks = (makeAddMemberToCourseInstanceFn(courseInstance) for courseInstance in courseInstances)
           async.parallel tasks, (err, results) =>
             return @sendDatabaseError(res, err) if err
-            @sendSuccess(res)
+            @sendSuccess(res, courseInstances)
 
 module.exports = new CourseInstanceHandler()