Duplicate Django Object - Admin Action

gistfile1.py

from django.contrib import admin
#other imports removed

def copy_course(modeladmin, request, queryset):
    import copy

    for course in queryset:
    	# multiple could be selected
    	
        course_copy = copy.copy(course) # django copy object
        course_copy.id = None   # set 'id' to None to create new object

	# Clear out values
        course_copy.building = None
        course_copy.room = None

        course_copy.template = False
        course_copy.template_course = course

        course_copy.signup_count = 0
        course_copy.attendance_count = 0

        course_copy.credit = False
        course_copy.cancelled = False
        course_copy.deleted = False

        course_copy.processed = False
        course_copy.processed_date = None

        course_copy.approved = False
        course_copy.approved_user = None
        course_copy.approved_notes = None

        course_copy.user_created = Person.objects.get(django_user=request.user)

        course_copy.date_start = None
        course_copy.date_end = None

        course_copy.save()    # initial save

        # copy M2M relationship: prerequisites
        for prerequisite in course.prerequisite_courses.all():
            course_copy.prerequisite_courses.add(prerequisite)

        course_copy.save()  # (7) save the copy

        copy_course.short_description = "Duplicate Course"

# Register your models here.

class CourseAdmin(admin.ModelAdmin):
    actions = [copy_course]
    
admin.site.register(Course,CourseAdmin)