From 84acec288071d5dad870158b6a65feb3ac8a0bfc Mon Sep 17 00:00:00 2001
From: Matt Lott <mattlott@live.com>
Date: Fri, 20 Nov 2015 14:29:06 -0800
Subject: [PATCH] Classroom counts script

---
 .../mongodb/queries/classroomCounts.js        | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 scripts/analytics/mongodb/queries/classroomCounts.js

diff --git a/scripts/analytics/mongodb/queries/classroomCounts.js b/scripts/analytics/mongodb/queries/classroomCounts.js
new file mode 100644
index 000000000..030dcbd37
--- /dev/null
+++ b/scripts/analytics/mongodb/queries/classroomCounts.js
@@ -0,0 +1,44 @@
+// Print out classrooms ordered by size
+
+// Usage:
+// mongo <address>:<port>/<database> <script file> -u <username> -p <password>
+
+var userClassroomMap = {};
+var cursor = db.classrooms.find({$where: 'this.members.length > 40'}, {ownerID: 1, name: 1, members: 1});
+while (cursor.hasNext()) {
+  var doc = cursor.next();
+  var userID = doc.ownerID.valueOf();
+  if (!userClassroomMap[userID]) userClassroomMap[userID] = [];
+  userClassroomMap[userID].push({
+    classroomID: doc._id,
+    className: doc.name,
+    count: doc.members.length
+  });
+}
+
+var userIDs = [];
+for (var userID in userClassroomMap) {
+  userIDs.push(new ObjectId(userID));
+}
+
+var classrooms = [];
+cursor = db.users.find({_id: {$in: userIDs}}, {email: 1});
+while (cursor.hasNext()) {
+  var doc = cursor.next();
+  var userID = doc._id.valueOf();
+  for (var i = 0; i < userClassroomMap[userID].length; i++) {
+    classrooms.push({
+      ownerID: userID,
+      email: doc.email,
+      classroomID: userClassroomMap[userID][i].classroomID,
+      className: userClassroomMap[userID][i].className,
+      count: userClassroomMap[userID][i].count
+    });
+  }
+}
+
+classrooms.sort(function(a, b) { return a.count > b.count ? -1 : 1;});
+for (var i = 0; i < classrooms.length; i++) {
+  print(classrooms[i].count, classrooms[i].className, classrooms[i].email, classrooms[i].classroomID.valueOf());
+}
+print("Total classes:", classrooms.length);