Add confirmation date to validator and denormalise existing data on m…

…igration #1875

data-serving/scripts/setup-db/migrations/20211109102327-denormalise-confirmation-date-1875.js

@@ -0,0 +1,39 @@
+const confirmationDate = {
+  bsonType: "date",
+};
+
+module.exports = {
+  async up(db, client) {
+    let res = await db.command({listCollections: undefined, filter: {name: 'cases'}});
+    let schema = res.cursor.firstBatch[0].options.validator.$jsonSchema;
+    schema.properties.confirmationDate = confirmationDate;
+    await db.command({ collMod: 'cases', validator:{ $jsonSchema: schema } } );
+
+    // now amend the existing cases. This must be done one by one so will take a lot of time!
+    const collection = db.collection('cases');
+    collection.find({}).forEach(function(err, doc) {
+      if(!doc) {
+        console.error(`error ${err} migrating confirmation date on doc ${doc?._id ?? ''}`);
+        // continue as subsequent case modifications may still work
+        return;
+      }
+      doc.events.forEach((anEvent) => {
+        if (anEvent.name === 'confirmed') {
+          const confirmationDate = anEvent.dateRange.start;
+          collection.updateOne({ _id: doc._id }, { confirmationDate });
+          return;
+        }
+      });
+    });
+  },
+
+  async down(db, client) {
+    let res = await db.command({listCollections: undefined, filter: {name: 'cases'}});
+    let schema = res.cursor.firstBatch[0].options.validator.$jsonSchema;
+    delete schema.properties.confirmationDate;
+    await db.command( { collMod: 'cases', validator:{ $jsonSchema: schema } } );
+
+    const collection = db.collection('cases');
+    collection.updateMany({}, {$unset: {"confirmationDate":1}});
+  }
+};