fix: lesson indexing

fix: upcoming course and doctype cleanup

community/lms/doctype/chapter/chapter.js

@@ -2,7 +2,15 @@
 // For license information, please see license.txt
 
 frappe.ui.form.on('Chapter', {
-	// refresh: function(frm) {
 
-	// }
+  onload: function (frm) {
+    frm.set_query("lesson", "lessons", function () {
+      return {
+        filters: {
+          "chapter": frm.doc.name,
+        }
+      };
+    });
+  }
+
 });

community/lms/doctype/chapter/chapter.json

@@ -9,7 +9,7 @@
   "course",
   "title",
   "description",
-  "index_"
+  "lessons"
  ],
  "fields": [
   {
@@ -31,10 +31,10 @@
    "options": "LMS Course"
   },
   {
-   "default": "1",
-   "fieldname": "index_",
-   "fieldtype": "Int",
-   "label": "Index"
+   "fieldname": "lessons",
+   "fieldtype": "Table",
+   "label": "Lessons",
+   "options": "Lessons"
   }
  ],
  "index_web_pages_for_search": 1,
@@ -45,7 +45,7 @@
    "link_fieldname": "chapter"
   }
  ],
- "modified": "2021-07-23 19:03:57.946831",
+ "modified": "2021-07-27 16:28:08.667964",
  "modified_by": "Administrator",
  "module": "LMS",
  "name": "Chapter",

community/lms/doctype/chapter/chapter.py

@@ -5,15 +5,6 @@
 from __future__ import unicode_literals
 import frappe
 from frappe.model.document import Document
-from ...utils import slugify
 
 class Chapter(Document):
-    def get_lessons(self):
-        rows = frappe.db.get_all("Lesson",
-            filters={"chapter": self.name},
-            fields='name',
-            order_by="index_")
-        return [frappe.get_doc('Lesson', row['name']) for row in rows]
-
-    def get_slugified_chapter_title(self):
-        return slugify(self.title)
+    pass

community/lms/doctype/chapters/chapters.json

@@ -0,0 +1,32 @@
+{
+ "actions": [],
+ "creation": "2021-07-27 16:25:02.903245",
+ "doctype": "DocType",
+ "editable_grid": 1,
+ "engine": "InnoDB",
+ "field_order": [
+  "chapter"
+ ],
+ "fields": [
+  {
+   "fieldname": "chapter",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "label": "Chapter",
+   "options": "Chapter",
+   "reqd": 1
+  }
+ ],
+ "index_web_pages_for_search": 1,
+ "istable": 1,
+ "links": [],
+ "modified": "2021-07-27 16:25:02.903245",
+ "modified_by": "Administrator",
+ "module": "LMS",
+ "name": "Chapters",
+ "owner": "Administrator",
+ "permissions": [],
+ "sort_field": "modified",
+ "sort_order": "DESC",
+ "track_changes": 1
+}

community/lms/doctype/chapters/chapters.py

@@ -0,0 +1,8 @@
+# Copyright (c) 2021, FOSS United and contributors
+# For license information, please see license.txt
+
+# import frappe
+from frappe.model.document import Document
+
+class Chapters(Document):
+	pass

community/lms/doctype/lesson/lesson.json

@@ -10,7 +10,6 @@
   "include_in_preview",
   "column_break_4",
   "title",
-  "index_",
   "index_label",
   "section_break_6",
   "body",
@@ -31,13 +30,6 @@
    "in_list_view": 1,
    "label": "Title"
   },
-  {
-   "default": "1",
-   "fieldname": "index_",
-   "fieldtype": "Int",
-   "in_list_view": 1,
-   "label": "Index"
-  },
   {
    "fieldname": "body",
    "fieldtype": "Markdown Editor",
@@ -75,7 +67,7 @@
  ],
  "index_web_pages_for_search": 1,
  "links": [],
- "modified": "2021-06-29 13:34:49.077363",
+ "modified": "2021-07-27 16:28:29.203624",
  "modified_by": "Administrator",
  "module": "LMS",
  "name": "Lesson",

community/lms/doctype/lessons/lessons.json

@@ -0,0 +1,31 @@
+{
+ "actions": [],
+ "creation": "2021-07-27 16:25:48.269536",
+ "doctype": "DocType",
+ "editable_grid": 1,
+ "engine": "InnoDB",
+ "field_order": [
+  "lesson"
+ ],
+ "fields": [
+  {
+   "fieldname": "lesson",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "label": "Lesson",
+   "options": "Lesson"
+  }
+ ],
+ "index_web_pages_for_search": 1,
+ "istable": 1,
+ "links": [],
+ "modified": "2021-07-27 16:53:52.732191",
+ "modified_by": "Administrator",
+ "module": "LMS",
+ "name": "Lessons",
+ "owner": "Administrator",
+ "permissions": [],
+ "sort_field": "modified",
+ "sort_order": "DESC",
+ "track_changes": 1
+}

community/lms/doctype/lessons/lessons.py

@@ -0,0 +1,8 @@
+# Copyright (c) 2021, FOSS United and contributors
+# For license information, please see license.txt
+
+# import frappe
+from frappe.model.document import Document
+
+class Lessons(Document):
+	pass

community/lms/doctype/lms_course/lms_course.js

@@ -2,7 +2,15 @@
 // For license information, please see license.txt
 
 frappe.ui.form.on('LMS Course', {
-	// refresh: function(frm) {
 
-	// }
+  onload: function (frm) {
+    frm.set_query("chapter", "chapters", function () {
+      return {
+        filters: {
+          "course": frm.doc.name,
+        }
+      };
+    });
+  }
+
 });

community/lms/doctype/lms_course/lms_course.json

@@ -1,11 +1,5 @@
 {
  "actions": [
-  {
-   "action": "community.lms.doctype.lms_course.lms_course.reindex_lessons",
-   "action_type": "Server Action",
-   "group": "Reindex",
-   "label": "Reindex Lessons"
-  },
   {
    "action": "community.lms.doctype.lms_course.lms_course.reindex_exercises",
    "action_type": "Server Action",
@@ -30,7 +24,8 @@
   "disable_self_learning",
   "section_break_5",
   "short_introduction",
-  "description"
+  "description",
+  "chapters"
  ],
  "fields": [
   {
@@ -93,6 +88,12 @@
    "fieldname": "upcoming",
    "fieldtype": "Check",
    "label": "Is an Upcoming Course"
+  },
+  {
+   "fieldname": "chapters",
+   "fieldtype": "Table",
+   "label": "Chapters",
+   "options": "Chapters"
   }
  ],
  "index_web_pages_for_search": 1,
@@ -112,14 +113,9 @@
    "group": "Mentors",
    "link_doctype": "LMS Course Mentor Mapping",
    "link_fieldname": "course"
-  },
-  {
-   "group": "Mentors",
-   "link_doctype": "LMS Mentor Request",
-   "link_fieldname": "course"
   }
  ],
- "modified": "2021-07-23 19:01:29.765570",
+ "modified": "2021-07-28 19:01:50.677445",
  "modified_by": "Administrator",
  "module": "LMS",
  "name": "LMS Course",

community/lms/doctype/lms_course/lms_course.py

@@ -9,8 +9,10 @@ import json
 from ...utils import slugify
 from community.query import find, find_all
 from frappe.utils import flt, cint
+from ...utils import slugify
 
 class LMSCourse(Document):
+
     @staticmethod
     def find(name):
         """Returns the course with specified name.
@@ -112,17 +114,42 @@ class LMSCourse(Document):
     def get_chapters(self):
         """Returns all chapters of this course.
         """
-        # TODO: chapters should have a way to specify the order
-        return find_all("Chapter", course=self.name, order_by="index_")
+        chapters = []
+        for row in self.chapters:
+            chapter_details = frappe.db.get_value("Chapter", row.chapter,
+                                                ["name", "title", "description"],
+                                                as_dict=True)
+            chapter_details.idx = row.idx
+            chapters.append(chapter_details)
+        return chapters
 
-    def get_lessons(self):
-        """ Returns all lessons of this course """
+    def get_lessons(self, chapter=None):
+        """ If chapter is passed, returns lessons of only that chapter.
+        Else returns lessons of all chapters of the course """
         lessons = []
-        chapters = self.get_chapters()
-        for chapter in chapters:
-            lessons.append(frappe.get_all("Lesson", {"chapter": chapter.name}))
+
+        if chapter:
+            return self.get_lesson_details(chapter)
+
+        for chapter in self.get_chapters():
+            lesson = self.get_lesson_details(chapter)
+            lessons += lesson
+
         return lessons
 
+    def get_lesson_details(self, chapter):
+        lessons = []
+        lesson_list = frappe.get_all("Lessons", {"parent": chapter.name},
+                                        ["lesson", "idx"], order_by="idx")
+        for row in lesson_list:
+            lesson_details = frappe.get_doc("Lesson", row.lesson)
+            lesson_details.number = flt("{}.{}".format(chapter.idx, row.idx))
+            lessons.append(lesson_details)
+        return lessons
+
+    def get_slugified_chapter_title(self, chapter):
+        return slugify(chapter)
+
     def get_course_progress(self):
         """ Returns the course progress of the session user """
         lesson_count = len(self.get_lessons())
@@ -160,38 +187,12 @@ class LMSCourse(Document):
             visibility="Public")
         return batches
 
-    def get_chapter(self, index):
-        return find("Chapter", course=self.name, index_=index)
-
-    def get_lesson(self, chapter_index, lesson_index):
-        chapter_name = frappe.get_value(
-            "Chapter",
-            {"course": self.name, "index_": chapter_index},
-            "name")
-        lesson_name = chapter_name and frappe.get_value(
-            "Lesson",
-            {"chapter": chapter_name, "index_": lesson_index},
-            "name")
-        return lesson_name and frappe.get_doc("Lesson", lesson_name)
-
     def get_lesson_index(self, lesson_name):
         """Returns the {chapter_index}.{lesson_index} for the lesson.
         """
-        lesson = frappe.get_doc("Lesson", lesson_name)
-        chapter = frappe.get_doc("Chapter", lesson.chapter)
-        return f"{chapter.index_}.{lesson.index_}"
-
-    def reindex_lessons(self):
-        for i, c in enumerate(self.get_chapters(), start=1):
-            c.index_ = i
-            c.save()
-            self._reindex_lessons_in_chapter(c)
-
-    def _reindex_lessons_in_chapter(self, c):
-        for i, lesson in enumerate(c.get_lessons(), start=1):
-            lesson.index = i
-            lesson.index_label = f"{c.index_}.{i}"
-            lesson.save()
+        lesson = frappe.db.get_value("Lessons", {"lesson": lesson_name}, ["idx", "parent"], as_dict=True)
+        chapter = frappe.db.get_value("Chapters", {"chapter": lesson.parent}, ["idx"], as_dict=True)
+        return f"{chapter.idx}.{lesson.idx}"
 
     def reindex_exercises(self):
         for i, c in enumerate(self.get_chapters(), start=1):
@@ -202,7 +203,7 @@ class LMSCourse(Document):
 
     def _reindex_exercises_in_chapter(self, c):
         i = 1
-        for lesson in c.get_lessons():
+        for lesson in self.get_lessons(c):
             for exercise in lesson.get_exercises():
                 exercise.index_ = i
                 exercise.index_label = f"{c.index_}.{i}"
@@ -302,9 +303,6 @@ class LMSCourse(Document):
             return None
         return sum(ratings)/len(ratings)
 
-    def get_outline(self):
-        return CourseOutline(self)
-
     def get_progress(self, lesson):
         return frappe.db.get_value("LMS Course Progress",
                 {
@@ -314,55 +312,14 @@ class LMSCourse(Document):
                 },
                 ["status"])
 
-class CourseOutline:
-    def __init__(self, course):
-        self.course = course
-        self.chapters = self.get_chapters()
-        self.lessons = self.get_lessons()
-
-    def get_next(self, current):
+    def get_neighbours(self, current, lessons):
         current = flt(current)
-        numbers = sorted(lesson['number'] for lesson in self.lessons)
-        try:
-            index = numbers.index(current)
-            return numbers[index+1]
-        except IndexError:
-            return None
-
-    def get_prev(self, current):
-        current = flt(current)
-        numbers = sorted(lesson['number'] for lesson in self.lessons)
-        try:
-            index = numbers.index(current)
-            if index == 0:
-                return None
-            return numbers[index-1]
-        except IndexError:
-            return None
-
-    def get_chapters(self):
-        return frappe.db.get_all("Chapter",
-            filters={"course": self.course.name},
-            fields=["name", "title", "index_"],
-            order_by="index_")
-
-    def get_lessons(self):
-        chapters = [c['name'] for c in self.chapters]
-        lessons = frappe.db.get_all("Lesson",
-            filters={"chapter": ["IN", chapters]},
-            fields=["name", "title", "chapter", "index_"])
-
-        chapter_numbers = {c['name']: c['index_'] for c in self.chapters}
-        for lesson in lessons:
-            lesson['number'] = flt("{}.{}".format(chapter_numbers[lesson['chapter']], lesson['index_']))
-        return lessons
-
-@frappe.whitelist()
-def reindex_lessons(doc):
-    course_data = json.loads(doc)
-    course = frappe.get_doc("LMS Course", course_data['name'])
-    course.reindex_lessons()
-    frappe.msgprint("All lessons in this course have been re-indexed.")
+        numbers = sorted(lesson.number for lesson in lessons)
+        index = numbers.index(current)
+        return {
+                "prev": numbers[index-1] if index-1 >= 0 else None,
+                "next": numbers[index+1] if index+1 < len(numbers) else None
+            }
 
 @frappe.whitelist()
 def reindex_exercises(doc):

community/lms/widgets/BatchTabs.html

@@ -1,67 +0,0 @@
-<div class="mt-5">
-  <a class="anchor_style" href="/courses">Courses</a> /{% if course.is_mentor(frappe.session.user) %} <a
-    class="anchor_style" href="/courses/{{ course.name }}"> {{ course.title }}</a> {% else %} <span class="text-muted">
-    {{ course.title }}</span> {% endif %}
-  {% set all_memberships = course.get_all_memberships(frappe.session.user) %}
-  {% if membership and membership.batch and all_memberships | length > 1 %}
-  <a class="pull-right dropdown-item border rounded" style="width: 10rem;" href="#" id="navbarDropdown" role="button"
-    data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
-    {{ membership.batch_title }}
-  </a>
-  <div class="dropdown-menu" aria-labelledby="navbarDropdown">
-    {% for data in all_memberships %}
-    {% if data.batch != membership.batch %}
-    <a class="dropdown-item switch-batch"
-      href="/courses/{{ course.name }}/home?batch={{ data.batch }}">{{ data.batch_title }}</a>
-    {% endif %}
-    {% endfor %}
-  </div>
-  {% endif %}
-</div>
-{% if not membership %}
-{% set display_class = "hide" %}
-{% else %}
-{% set display_class = "" %}
-{% endif %}
-
-<ul class="nav nav-tabs mt-4">
-  <li class="nav-item">
-    <a class="nav-link" id="home" href="/courses/{{course.name}}/home{{ course.query_parameter }}">Home</a>
-  </li>
-  <li class="nav-item">
-    {% set lesson_index = course.get_lesson_index(membership.current_lesson) if membership and membership.current_lesson
-    else '1.1' %}
-    <a class="nav-link" id="learn"
-      href="{{ course.get_learn_url(lesson_index) }}{{ course.query_parameter }}">Lessons</a>
-  </li>
-  <!-- <li class="nav-item">
-    <a class="nav-link" id="schedule" href="/courses/{{course.name}}/schedule">Schedule</a>
-  </li> -->
-  <li class="nav-item {{ display_class }}">
-    <a class="nav-link" id="members" href="/courses/{{course.name}}/members{{ course.query_parameter }}">Members</a>
-  </li>
-  <!-- <li class="nav-item {{ display_class }}">
-    <a class="nav-link" id="discussion" href="/courses/{{course.name}}/discuss">Discussion</a>
-  </li> -->
-  <!-- <li class="nav-item">
-    <a class="nav-link" id="about" href="/courses/{{course.name}}/about">About</a>
-  </li> -->
-  {% if membership and membership.batch and course.is_mentor(frappe.session.user) %}
-  <li class="nav-item">
-    <a class="nav-link" id="progress" href="/courses/{{course.name}}/progress{{ course.query_parameter }}">Progress</a>
-  </li>
-  {% endif %}
-</ul>
-{% block script %}
-<script>
-  frappe.ready(() => {
-    var selector = document.querySelector(`a[href="${decodeURIComponent(window.location.pathname)}{{ course.query_parameter }}"]`)
-    if (selector) {
-      selector.classList.add('active');
-    }
-    else {
-      $("#learn").addClass('active')
-    }
-  })
-</script>
-{% endblock %}

community/lms/widgets/ChapterTeaser.html

@@ -1,12 +1,12 @@
 <div>
 
-  <div class="small-title chapter-title" data-target="#{{ chapter.get_slugified_chapter_title() }}"
+  <div class="small-title chapter-title" data-target="#{{ course.get_slugified_chapter_title(chapter.title) }}"
     data-toggle="collapse" aria-expanded="false">
     <img class="chapter-icon" src="/assets/community/icons/chevron-right.svg">
     {{ index }}. {{ chapter.title }}
   </div>
 
-  <div class="chapter-content collapse navbar-collapse" id="{{ chapter.get_slugified_chapter_title() }}">
+  <div class="chapter-content collapse navbar-collapse" id="{{ course.get_slugified_chapter_title(chapter.title) }}">
 
     {% if chapter.description %}
     <div class="chapter-description muted-text">
@@ -16,13 +16,13 @@
 
     <div class="lessons">
 
-      {% for lesson in chapter.get_lessons() %}
+      {% for lesson in course.get_lessons(chapter) %}
 
-      <div class="lesson-info {% if membership.current_lesson == lesson.name %} active-lesson {% endif %}">
+      <div class="lesson-info{% if membership.current_lesson == lesson.name %} active-lesson {% endif %}">
 
         {% if membership or lesson.include_in_preview %}
         <a class="lesson-links"
-          href="{{ course.get_learn_url(course.get_lesson_index(lesson.name)) }}{{course.query_parameter}}"
+          href="{{ course.get_learn_url(lesson.number) }}{{course.query_parameter}}"
           data-course="{{ course.name }}">
           {{ lesson.title }}
 

community/patches.txt

@@ -6,3 +6,4 @@ community.patches.replace_member_with_user_in_batch_membership
 community.patches.replace_member_with_user_in_course_mentor_mapping
 community.patches.replace_member_with_user_in_lms_message
 community.patches.replace_member_with_user_in_mentor_request
+community.patches.v0_0.chapter_lesson_index_table

community/patches/v0_0/chapter_lesson_index_table.py

@@ -0,0 +1,48 @@
+from __future__ import unicode_literals
+import frappe
+
+def execute():
+    frappe.reload_doc("lms", "doctype", "lms_course")
+    frappe.reload_doc("lms", "doctype", "chapter")
+    frappe.reload_doc("lms", "doctype", "lesson")
+
+    update_chapters()
+    update_lessons()
+
+def update_chapters():
+    courses = frappe.get_all("LMS Course", pluck="name")
+    for course in courses:
+        course_details = frappe.get_doc("LMS Course", course)
+        chapters = frappe.get_all("Chapter",
+                                    {
+                                        "course": course
+                                    },
+                                    ["name"],
+                                    order_by= "index_"
+                                )
+        for chapter in chapters:
+            course_details.append("chapters",
+                                    {
+                                        "chapter": chapter.name
+                                    })
+
+        course_details.save()
+
+def update_lessons():
+    chapters = frappe.get_all("Chapter", pluck="name")
+    for chapter in chapters:
+        chapter_details = frappe.get_doc("Chapter", chapter)
+        lessons = frappe.get_all("Lesson",
+                                    {
+                                        "chapter": chapter
+                                    },
+                                    ["name"],
+                                    order_by= "index_"
+                                )
+        for lesson in lessons:
+            chapter_details.append("lessons",
+                                    {
+                                        "lesson": lesson.name
+                                    })
+
+        chapter_details.save()

community/public/css/style.css

@@ -757,7 +757,7 @@ div.custom-checkbox>label>input:checked+img {
 }
 
 .lesson-links {
-  display: block;
+  display: flex;
   padding: 0 1rem;
   margin-bottom: .25rem;
   color: inherit;

community/www/batch/discuss.html

@@ -11,7 +11,6 @@
 {% block content %}
 
 <div class="container">
-  {{ widgets.BatchTabs(course=course, membership=membership) }}
   <div class="messages-container mt-5">
     {{ widgets.BatchHeader(batch_name=batch.title, member_count=member_count)}}
     <ol class="messages">

community/www/batch/learn.html

@@ -30,7 +30,7 @@
       <div class="lesson-pagination-parent">
         {{ LessonContent(lesson) }}
         {% if membership %}
-        {{ pagination(prev_chap, prev_url, next_chap, next_url) }}
+        {{ pagination(prev_url, next_url) }}
         {% endif %}
       </div>
     </div>
@@ -49,16 +49,15 @@
   {% if membership or lesson.include_in_preview %}
   <div class="common-card-style lesson-content-card from-markdown">{{ lesson.render_html() }}</div>
   {% else %}
-  <div class="no-preview-message">
-    <span>This lesson is not available for Preview. Please join the course to access this lesson.</span>
-    <a href="/courses/{{ course.name }}">Checkout Course Details.</a>
+  <div class="common-card-style lesson-content-card">
+    <span>This lesson is not available for Preview. Please join the course to access this lesson. <a href="/courses/{{ course.name }}">Checkout Course Details.</a></span>
   </div>
   {% endif %}
 
 </div>
 {% endmacro %}
 
-{% macro pagination(prev_chap, prev_url, next_chap, next_url) %}
+{% macro pagination(prev_url, next_url) %}
 <div class="lesson-pagination">
 
   <div>

community/www/batch/learn.py

@@ -12,7 +12,6 @@ def get_context(context):
     lesson_index = frappe.form_dict.get("lesson")
     lesson_number = f"{chapter_index}.{lesson_index}"
 
-    course_name = context.course.name
     if not chapter_index or not lesson_index:
         if context.batch:
             index_ = get_lesson_index(context.course, context.batch, frappe.session.user) or "1.1"
@@ -21,20 +20,12 @@ def get_context(context):
         frappe.local.flags.redirect_location = context.course.get_learn_url(index_) + context.course.query_parameter
         raise frappe.Redirect
 
-    context.lesson = context.course.get_lesson(chapter_index, lesson_index)
-    context.lesson_index = lesson_index
-    context.chapter_index = chapter_index
-
-    outline = context.course.get_outline()
-    prev_ = outline.get_prev(lesson_number)
-    next_ = outline.get_next(lesson_number)
-    context.prev_chap = get_chapter_title(course_name, prev_)
-    context.next_chap = get_chapter_title(course_name, next_)
-    context.next_url = context.course.get_learn_url(next_) and  context.course.get_learn_url(next_) + context.course.query_parameter
-    context.prev_url = context.course.get_learn_url(prev_) and context.course.get_learn_url(prev_) + context.course.query_parameter
+    context.lesson = list(filter(lambda x: cstr(x.number) == lesson_number, context.lessons))[0]
+    neighbours = context.course.get_neighbours(lesson_number, context.lessons)
+    context.next_url = get_learn_url(neighbours["next"], context.course)
+    context.prev_url = get_learn_url(neighbours["prev"], context.course)
 
     context.page_extensions = get_page_extensions()
-
     context.page_context = {
         "course": context.course.name,
         "batch": context.get("batch") and context.batch.name,
@@ -42,6 +33,9 @@ def get_context(context):
         "is_member": context.membership is not None
     }
 
+def get_learn_url(lesson_number, course):
+    return course.get_learn_url(lesson_number) and course.get_learn_url(lesson_number) + course.query_parameter
+
 def get_chapter_title(course_name, lesson_number):
     if not lesson_number:
         return

community/www/batch/utils.py

@@ -10,12 +10,12 @@ def get_common_context(context):
     except KeyError:
         batch_name = None
 
-    course = Course.find(course_name)
+    course = frappe.get_doc("LMS Course", course_name)
     if not course:
         context.template = "www/404.html"
         return
     context.course = course
-
+    context.lessons = course.get_lessons()
     membership = course.get_membership(frappe.session.user, batch_name)
     context.membership = membership
     if membership:

community/www/courses/course.py

@@ -1,5 +1,4 @@
 import frappe
-from community.lms.models import Course
 
 def get_context(context):
     context.no_cache = 1
@@ -10,7 +9,7 @@ def get_context(context):
         frappe.local.flags.redirect_location = "/courses"
         raise frappe.Redirect
 
-    course = Course.find(course_name)
+    course = frappe.get_doc("LMS Course", course_name)
     if course is None:
         frappe.local.flags.redirect_location = "/courses"
         raise frappe.Redirect