start to work on new functions

services/database/index.js

@@ -62,6 +62,9 @@ exports.artists = artists;
 const boxes = require("./boxes");
 exports.boxes = boxes;
 
+const progress = require("./progress");
+exports.progress = progress;
+
 const videos = require("./videos");
 exports.videos = videos;
 

services/database/progress.js

@@ -0,0 +1,27 @@
+const { ObjectId } = require('mongodb');
+const connector = require("./CONNECTOR");
+var dbo;
+connector.connect().then((ret) => {
+  dbo = ret;
+});
+
+exports.get = function (parentId, callback) {
+  dbo.collection("progress")
+    .findOne({ parentId: parentId }, (err, result) => {
+      if (err) throw err;
+      callback(result);
+    });
+}
+exports.update = function (item) {
+  dbo.collection("progress").deleteMany({ userId: ObjectId(item.userId), parentId: item.parentId }, () => {
+    dbo.collection("progress").insertOne(item, (err) => {
+      if (err) throw err;
+    });
+  });
+};
+
+exports.delete = function (item) {
+  dbo.collection("progress").deleteMany({ userId: ObjectId(item.userId), id: item.id }, (err) => {
+    if (err) throw err;
+  });
+}