added access variable to exams soo we can distinguish private, public and confidential exams and also bugfixes and improvements

scripts/updatePrivateFieldExams.js

@@ -0,0 +1,51 @@
+import dotenv from "dotenv";
+dotenv.config();
+import { MongoClient } from "mongodb";
+const uri = process.env.MONGODB_URI || "";
+const options = {
+  maxPoolSize: 10,
+};
+const dbName = process.env.MONGODB_DB; // change this to prod db when needed
+async function migrateData() {
+  const MODULE_ARRAY = ["reading", "listening", "writing", "speaking", "level"];
+  const client = new MongoClient(uri, options);
+
+  try {
+    await client.connect();
+    console.log("Connected to MongoDB");
+    if (!process.env.MONGODB_DB) {
+      throw new Error("Missing env var: MONGODB_DB");
+    }
+    const db = client.db(dbName);
+    for (const string of MODULE_ARRAY) {
+      const collection = db.collection(string);
+      const result = await collection.updateMany(
+        { private: { $exists: false } },
+        { $set: { access: "public" } }
+      );
+      const result2 = await collection.updateMany(
+        { private: true },
+        { $set: { access: "private" }, $unset: { private: "" } }
+      );
+      const result1 = await collection.updateMany(
+        { private: { $exists: true } },
+        { $set: { access: "public" } }
+      );
+      console.log(
+        `Updated ${
+          result.modifiedCount + result1.modifiedCount
+        } documents to "access: public" in ${string}`
+      );
+      console.log(
+        `Updated ${result2.modifiedCount} documents to "access: private" and removed private var in ${string}`
+      );
+    }
+    console.log("Migration completed successfully!");
+  } catch (error) {
+    console.error("Migration failed:", error);
+  } finally {
+    await client.close();
+    console.log("MongoDB connection closed.");
+  }
+}
+//migrateData(); // uncomment to run the migration