On Friday, March 27, 2015 at 11:10:19 PM UTC+8, Filipe Ximenes wrote:
>
> Just checking: when you say you are adding users using
>
> Group.users.add(user)
>
> in this case `Group` is an instance of the Group model and NOT the actual
> model, correct?
>
> if so, you can make a query using the same instance, looking for the user:
>
> user = Group.user.filter(user).first()
> if user:
> print('user exists in this group')
> else:
> print('user does not exists in this group')
>
>
>
>
QuerySet.exists is better than QuerySet.first
> On Thu, Mar 26, 2015 at 11:24 PM, nobody <jupit...@gmail.com <javascript:>
> > wrote:
>
>> Hi,
>>
>> Sorry for asking a new B question. I have following code in a module.py:
>>
>>
>> class Group(models.Model):
>> ......
>> users = models.ManyToManyField(User, blank=True, null=True)
>> .....
>>
>> I can add user or delete user by calling Group.users.add(user) or
>> Group.users.remove(user), but how can I check if the user has already in
>> the database?
>>
>> Thank you.
>>
>> -j
>>
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>
>
>
> --
>
>
> *Filipe Ximenes*+55 (81) 8245-9204
>
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