我在创建用户的逻辑上需要一点帮助，使他的名字独一无二:
我有一个 Django 用户配置文件。我以这种方式创建用户:
fullname = request.POST.get('fullname')
random_username = ''.join(random.sample(string.ascii_lowercase, 8))
new_user = User.objects.create_user(random_username, email, passwort)
##update siteprofile of this new user
userprofile = new_user.get_profile()
"""
i need to make this fullname unique with this logic:
for example john is the fullname of new user. i need to check if there are
other johns in db, if there is another user with this name, i will name the
user with 'john1'. if there are 2, the new user will get the name 'john3'
how can I check this in db in some efficient way?
"""
userprofile.name = fullname
userprofile.save()
请您参考如下方法:
您想在保存时检查 IntegrityError 并进行相应更新。执行查询以检查名称是否存在会产生竞争条件，您可以在其中搜索然后两个单独的线程尝试同时创建相同的全名。
from django.db import transaction
@transaction.commit_manually
def set_fullname(userprofile, fullname, i=0):
new_fullname = u"{}{}".format(fullname, str(i) if i else '')
try:
userprofile.fullname = new_fullname
userprofile.save()
transaction.commit()
return userprofile
except IntegrityError:
transaction.rollback()
i += 1
# Just recursively try until we a valid name. This could be problematic if you
# have a TON of users, but in that case you could just the filter before then to see
# what number to start from.
return set_fullname(userprofile, fullname, i)
userprofile = set_fullname(userprofile, fullname)
