Latest class owners script

scripts/analytics/mongodb/queries/classOwners.js

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+// Latest class owners (teachers)
+// Course instance owners assumed to be teachers unless hourOfCode=1
+
+// Usage:
+// mongo <address>:<port>/<database> <script file> -u <username> -p <password>
+
+var startDay = '2015-10-01';
+var endDay = '2016-10-01';
+print('Date range:', startDay, endDay);
+var userIDs = getClassOwners(startDay, endDay);
+print('Class owners found:', userIDs.length);
+var userEmails = getUserEmails(userIDs);
+print('User emails found:', userEmails.length);
+for (var i = 0; i < userEmails.length; i++) {
+  print(userEmails[i]);
+}
+
+function objectIdWithTimestamp(timestamp) {
+  // Convert string date to Date object (otherwise assume timestamp is a date)
+  if (typeof(timestamp) == 'string') timestamp = new Date(timestamp);
+  // Convert date object to hex seconds since Unix epoch
+  var hexSeconds = Math.floor(timestamp/1000).toString(16);
+  // Create an ObjectId with that hex timestamp
+  var constructedObjectId = ObjectId(hexSeconds + "0000000000000000");
+  return constructedObjectId
+}
+
+function getClassOwners(startDay, endDay) {
+  var userIDs = [];
+  var startObj = objectIdWithTimestamp(ISODate(startDay + "T00:00:00.000Z"));
+  var endObj = objectIdWithTimestamp(ISODate(endDay + "T00:00:00.000Z"))
+  var cursor = db.classrooms.find(
+    {$and:
+      [
+        {_id: {$gte: startObj}},
+        {_id: {$lt: endObj}}
+      ]
+    },
+    {ownerID: 1}
+  );
+
+  while (cursor.hasNext()) {
+    var myDoc = cursor.next();
+    if (myDoc.ownerID) {
+      userIDs.push(myDoc.ownerID);
+    }
+    else {
+      print('No classroom owner!');
+      printjson(myDoc);
+      break;
+    }
+  }
+
+  cursor = db.course.instances.find(
+    {$and:
+      [
+        {_id: {$gte: startObj}},
+        {_id: {$lt: endObj}}
+      ]
+    },
+    {hourOfCode: 1, ownerID: 1}
+  );
+  while (cursor.hasNext()) {
+    var myDoc = cursor.next();
+    if (myDoc.hourOfCode) continue;
+    if (myDoc.ownerID) {
+      userIDs.push(myDoc.ownerID);
+    }
+    else {
+      print('No course.instance owner!');
+      printjson(myDoc);
+      break;
+    }
+  }
+
+  return userIDs;
+}
+
+function getUserEmails(userIDs) {
+  var cursor = db['users'].find({_id: {$in: userIDs}}, {emailLower: 1});
+
+  var userEmails = [];
+  while (cursor.hasNext()) {
+    var myDoc = cursor.next();
+    if (myDoc.emailLower) {
+      userEmails.push(myDoc.emailLower);
+    }
+  }
+  userEmails.sort()
+  return userEmails;
+}