feat: redirect the learn page to the current lesson of the user

The current lesson is maintained in the LMS Batch Membership and that is
updated everytime a lesson page is visited.

community/lms/api.py

@@ -34,3 +34,21 @@ def submit_solution(exercise, code):
         return
     doc = ex.submit(code)
     return {"name": doc.name, "creation": doc.creation}
+
+@frappe.whitelist()
+def save_current_lesson(batch_name, lesson_name):
+    """Saves the current lesson for a student/mentor.
+    """
+    name = frappe.get_value(
+        doctype="LMS Batch Membership",
+        filters={
+            "batch": batch_name,
+            "member_email": frappe.session.user
+        },
+        fieldname="name")
+    if not name:
+        return
+    doc = frappe.get_doc("LMS Batch Membership", name)
+    doc.current_lesson = lesson_name
+    doc.save(ignore_permissions=True)
+    return {"current_lesson": doc.current_lesson}

community/lms/doctype/lms_batch/lms_batch.py

@@ -69,6 +69,24 @@ class LMSBatch(Document):
                 message.is_author = True
         return messages
 
+    def get_membership(self, email):
+        """Returns the membership document of given user.
+        """
+        name = frappe.get_value(
+            doctype="LMS Batch Membership",
+            filters={
+                "batch": self.name,
+                "member": email
+            },
+            fieldname="name")
+        return frappe.get_doc("LMS Batch Membership", name)
+
+    def get_current_lesson(self, user):
+        """Returns the name of the current lesson for the given user.
+        """
+        membership = self.get_membership(user)
+        return membership and membership.current_lesson
+
 @frappe.whitelist()
 def save_message(message, batch):
     doc = frappe.get_doc({

community/lms/doctype/lms_course/lms_course.py

@@ -150,6 +150,13 @@ class LMSCourse(Document):
             "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 get_outline(self):
         return CourseOutline(self)
 

community/www/batch/learn.html

@@ -84,49 +84,16 @@
   {{ super() }}
   {{ LiveCodeEditorJS() }}
 
-
-  <!-- <script type="text/javascript">
+  <script type="text/javascript">
     $(function() {
-      var editorLookup = {};
+      var batch_name = "{{ batch.name }}";
+      var lesson_name = "{{ lesson.name }}";
 
-      $(".canvas-editor").each((i, e) => {
-        var data = $(e).data();
-        var editor = new LiveCodeEditor(e, {
-          runtime: "python-canvas",
-          base_url: "{{ livecode_url }}",
-          codemirror: true,
-          userdata: data,
-          autosave: function(editor, code) {
-            // can't autosave when user is Guest
-            if (frappe.session.user == "Guest") {
-              return;
-            }
-            var data = editor.options.userdata;
-            var code = editor.codemirror.doc.getValue();
-            // console.log("autosaving...")
-            frappe.call("community.lms.api.autosave_section", {
-              section: data.section,
-              code: code
-            }).then((r) => {
-              // TODO: verify
-            })
-          }
-        })
-        editorLookup[data.section] = editor;
-      })
-
-      $(".canvas-editor .reset").each((i, e) => {
-        $(e).on("click", function(event) {
-          var data = $(this).parents(".canvas-editor").data();
-          var section = data.section;
-          frappe.call("community.lms.api.get_section", {
-            name: section
-          }).then(r => {
-            var editor = editorLookup[data.section];
-            editor.codemirror.doc.setValue(r.message.contents);
-          })
-        })
+      frappe.call("community.lms.api.save_current_lesson", {
+        "batch_name": batch_name,
+        "lesson_name": lesson_name
       })
     })
-  </script> -->
+  </script>
+
 {%- endblock %}

community/www/batch/learn.py

@@ -12,13 +12,14 @@ def get_context(context):
     batch_name = context.batch.name
 
     if not chapter_index or not lesson_index:
-        frappe.local.flags.redirect_location = f"/courses/{course_name}/{batch_name}/learn/1.1"
+        index_ = get_lesson_index(context.course, context.batch, frappe.session.user) or "1.1"
+        frappe.local.flags.redirect_location = get_learn_url(course_name, batch_name, index_)
         raise frappe.Redirect
 
     context.lesson = context.course.get_lesson(chapter_index, lesson_index)
     context.lesson_index = lesson_index
     context.chapter_index = chapter_index
-    print(context.lesson)
+
     outline = context.course.get_outline()
     next_ = outline.get_next(lesson_number)
     prev_ = outline.get_prev(lesson_number)
@@ -29,3 +30,9 @@ def get_learn_url(course_name, batch_name, lesson_number):
     if not lesson_number:
         return
     return f"/courses/{course_name}/{batch_name}/learn/{lesson_number}"
+
+def get_lesson_index(course, batch, user):
+    lesson = batch.get_current_lesson(user)
+    return lesson and course.get_lesson_index(lesson)
+
+