Script to move counters from v4 to v5

migrateV4toV5.js

@@ -0,0 +1,42 @@
+const MongoClient = require('mongodb').MongoClient;
+const url = "mongodb://localhost:27017";
+const dbName = 'test';
+const oldCounterCollection = "counters";
+const newCounterCollection = "newcounters";
+
+const Mapping = {
+  'id_1': {
+    reference_fields: ["ref_field1", "ref_field2"]
+  },
+  'id_2': {
+    reference_fields: ["ref_field3", "ref_field4"]
+  }
+};
+
+
+try {
+  MongoClient.connect(url, async (err, client) => {
+    if (err) console.log(err);
+
+    const db = client.db(dbName);
+    const Counter = db.collection(oldCounterCollection);
+    const NewCounter = db.collection(newCounterCollection);
+
+    await Promise.all(Object.keys(Mapping).map(async id => {
+      const counters = await Counter.find({ id }).toArray();
+      for (let index = 0; index < counters.length; index++) {
+        const { reference_value, seq } = counters[index];
+        const newReferenceValue = {};
+        Mapping[id].reference_fields.forEach((ref_id, i) => {
+          if (reference_value[i]) {
+            newReferenceValue[ref_id] = reference_value[i].slice(1, -1);
+          }
+        });
+        await NewCounter.insert({ id, seq, reference_value: newReferenceValue });
+      }
+    }));
+    console.log('Migration Done')
+  });
+} catch (error) {
+  console.log(error)
+}