send the lesson id when creating a lesson project

Author: Titanium2099

src/lib/ct-url-flags.js

@@ -53,7 +53,10 @@ const parseFlags = params => ({
     lesson: parseBooleanParam(params, LESSON_PARAM, false)
 });
 
-const flags = parseFlags(readSearchParams());
+const urlParams = readSearchParams();
+const flags = parseFlags(urlParams);
+// ?lessonId=<path>/<unit>/<lesson> names the Learning Path lesson the editor is embedded in.
+const lessonId = flags.lesson ? (urlParams.get('lessonId') || '') : '';
 
 /**
  * @returns {boolean} True if the URL explicitly asked for the compiler to be off.
@@ -75,6 +78,11 @@ const isCursorChatEnabled = () => flags.chat;
  */
 const isLessonMode = () => flags.lesson;
 
+/**
+ * @returns {string} Global id of the lesson the editor is embedded in, or '' when unknown.
+ */
+const getLessonId = () => lessonId;
+
 /**
  * Re-apply the flags that have to survive any in-editor rewrite of the query string.
  * @param {URLSearchParams} searchParams Search parameters that are about to be written to the URL
@@ -97,6 +105,7 @@ export {
     isMinimalMode,
     isCursorChatEnabled,
     isLessonMode,
+    getLessonId,
     applyPersistentFlags,
     MINIMAL_PARAM,
     LESSON_PARAM

src/lib/project-saver-hoc.jsx

@@ -10,6 +10,7 @@ import storage from '../lib/storage';
 import dataURItoBlob from '../lib/data-uri-to-blob';
 import saveProjectToServer from '../lib/save-project-to-server';
 import {reportLessonSaveResult} from '../lib/ct-lesson-messages';
+import {getLessonId} from '../lib/ct-url-flags';
 
 import {
     showAlertWithTimeout,
@@ -173,9 +174,11 @@ const ProjectSaverHOC = function (WrappedComponent) {
         }
         createNewProjectToStorage () {
             // In a lesson the project already has its lesson title, which the server should keep.
-            const requestParams = this.props.lessonMode && this.props.reduxProjectTitle ?
-                {title: this.props.reduxProjectTitle} :
-                null;
+            const requestParams = {};
+            if (this.props.lessonMode) {
+                if (this.props.reduxProjectTitle) requestParams.title = this.props.reduxProjectTitle;
+                if (getLessonId()) requestParams.lesson = getLessonId();
+            }
             return this.storeProject(null, requestParams)
                 .then(response => {
                     const projectId = response.id.toString();

src/lib/save-project-to-server.js

@@ -13,6 +13,7 @@ import storage from '../lib/storage';
  * @property {?boolean} params.isCopy a flag indicating if this save is creating a copy.
  * @property {?boolean} params.isRemix a flag indicating if this save is creating a remix.
  * @property {?string} params.title the title of the project.
+ * @property {?string} params.lesson the Learning Path lesson a new project is created for.
  * @return {Promise} A promise that resolves when the network request resolves.
  */
 export default function (projectId, vmState, params) {
@@ -31,6 +32,7 @@ export default function (projectId, vmState, params) {
     if (Object.prototype.hasOwnProperty.call(params, 'isRemix')) queryParams.is_remix = params.isRemix;
     if (Object.prototype.hasOwnProperty.call(params, 'title')) queryParams.title = params.title;
     if (Object.prototype.hasOwnProperty.call(params, 'source')) queryParams.source = params.source;
+    if (Object.prototype.hasOwnProperty.call(params, 'lesson')) queryParams.lesson = params.lesson;
 
     let qs = queryString.stringify(queryParams);
     if (qs) qs = `?${qs}`;