Search user from Database

[nobody]

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

[Filipe Ximenes]

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')

​

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[Chenxiong Qi]

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