def create_course():
from random import choice
from string import ascii_uppercase as uc, digits as dg
course_name = request.values['course_name']
part1 = ''.join(choice(uc) for j in range(3)) # 三个大写的英文
part2 = ''.join(choice(dg) for j in range(3)) # 三个随机数字
invitation_code = part1 + part2
search_result = Course.query.filter_by(id=invitation_code).first()
while search_result is not None:
part1 = ''.join(choice(uc) for j in range(3)) # 三个大写的英文
part2 = ''.join(choice(dg) for j in range(3)) # 三个随机数字
invitation_code = part1 + part2
newcourse = Course(invitation_code, course_name, g.user.id)
user = User.query.filter_by(id=g.user.id).first()
newcourse.creator = user
db.session.add(newcourse)
db.session.commit()
result = session['result']
result.append((url_for('t_class_section',
course_id=invitation_code), course_name))
session.pop('result', None)
session['result'] = result
return jsonify(invitation_code)
