Add script for fixing level session language settings in arena levels for classrooms

scripts/mongodb/migrations/2016-02-11-fix-arena-sessions.js

@@ -0,0 +1,34 @@
+// Updates all sessions for a given level and classroom to match the classroom language setting.
+// Usage:
+// mongo <address>:<port>/<database> <script file> -u <username> -p <password>
+
+// Set classroomID and levelSlug first before running!
+
+var classroomID = ObjectId('568ac66d648b9e5100de0cca');
+var levelSlug = 'wakka-maul';
+
+var classroom = db.classrooms.findOne({_id: classroomID});
+var level = db.levels.findOne({slug: levelSlug});
+
+if(!classroom) { throw new Error('Classroom not found (should be an id)'); }
+if(!level) { throw new Error('Level not found (should be a slug)'); }
+
+print('Classroom:', classroom.name);
+print('Members:', classroom.members.length);
+print('Level:', level.name);
+
+for (var i in classroom.members) {
+  var member = classroom.members[i];
+  var sessions = db.level.sessions.find({'level.original': level.original+'', 'creator': member+''}).toArray();
+  print('  user:', member);
+  for (var j in sessions) {
+    var session = sessions[j];
+    print('    session:', session._id, 'has language', session.codeLanguage);
+    if (session.codeLanguage === classroom.aceConfig.language) {
+      print('    all is well');
+      continue;
+    }
+    print('      updating language...');
+    print('      ', db.level.sessions.update({_id: session._id}, {$set: {codeLanguage: classroom.aceConfig.language}}));
+  }
+}