adding django admin command to change enrollment

common/djangoapps/student/management/commands/change_enrollment.py

+from django.core.management.base import BaseCommand, CommandError
+from optparse import make_option
+from student.models import CourseEnrollment, User
+
+
+class Command(BaseCommand):
+
+    help = """
+    Changes the enrollment status for students that meet
+    the criteria specified by the parameters to this command.
+
+    Example:
+
+        Change enrollment for user joe from audit to honor:
+
+          $ ... change_enrollment -u joe -c some/course/id --from audit --to honor
+
+        Change enrollment for all users in some/course/id from audit to honor
+
+          $ ... change_enrollment -u joe -c some/course/id --from audit --to honor
+
+    """
+
+    option_list = BaseCommand.option_list + (
+        make_option('-f', '--from',
+                    metavar='FROM_MODE',
+                    dest='from_mode',
+                    default=False,
+                    help='move from this enrollment mode'),
+        make_option('-t', '--to',
+                    metavar='TO_MODE',
+                    dest='to_mode',
+                    default=False,
+                    help='move to this enrollment mode'),
+        make_option('-u', '--user',
+                    metavar='USER',
+                    dest='user',
+                    default=False,
+                    help="User to move, if not specified will move all users in the course"),
+        make_option('-c', '--course',
+                    metavar='COURSE_ID',
+                    dest='course_id',
+                    default=False,
+                    help="course id to for transfer"),
+        make_option('-n', '--noop',
+                    action='store_true',
+                    dest='noop',
+                    default=False,
+                    help="display what will be done but don't actually do anything")
+
+    )
+
+    def handle(self, *args, **options):
+        if not options['course_id']:
+            raise CommandError("You must specify a course id for this command")
+        if not options['from_mode'] or not options['to_mode']:
+            raise CommandError('You must specify a "to" and "from" mode as parameters')
+        filter_args = dict(
+            course_id=options['course_id'],
+            mode=options['from_mode']
+        )
+        if options['user']:
+            if '@' in options['user']:
+                user = User.objects.get(email=options['user'])
+            else:
+                user = User.objects.get(user=options['user'])
+            filter_args['user'] = user
+        enrollments = CourseEnrollment.objects.filter(**filter_args)
+        if options['noop']:
+            print "Would have changed {num_enrollments} students from {from_mode} to {to_mode}".format(
+                num_enrollments=enrollments.count(),
+                from_mode=options['from_mode'],
+                to_mode=options['to_mode']
+            )
+        else:
+            for enrollment in enrollments:
+                enrollment.update_enrollment(mode=options['to_mode'])
+                enrollment.save()