Re: Return FK model

[Ben Davis]

@Javier,  not sure.. I've used user profiles on my past sites because that's
what I was told to do a while ago,   if inheritance works with
authentication and the admin,  I would definitely go that route.

Also, @Yanik,  I realized my UserProfile model example above was wrong,
the  user relation should be OneToOneField,   not ForeignKey.



On Thu, Sep 3, 2009 at 10:49 AM, Javier Guerra  wrote:

>
> On Thu, Sep 3, 2009 at 10:41 AM, Ben Davis wrote:
> > The django docs suggest using a UserProfile model when you need to add
> more
> > information about a user:
> >
> http://docs.djangoproject.com/en/dev/topics/auth/#storing-additional-information-about-users
>
> slightly OT: is there any advantage to use profiles instead of table
> inheritance?
>
> I know the userprofiles were the only choice before there was table
> inheritance; but is it still the best way?
>
> --
> Javier
>
> >
>

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Re: Return FK model

[Javier Guerra]

On Thu, Sep 3, 2009 at 10:41 AM, Ben Davis wrote:
> The django docs suggest using a UserProfile model when you need to add more
> information about a user:
> http://docs.djangoproject.com/en/dev/topics/auth/#storing-additional-information-about-users

slightly OT: is there any advantage to use profiles instead of table
inheritance?

I know the userprofiles were the only choice before there was table
inheritance; but is it still the best way?

-- 
Javier

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Re: Return FK model

[Ben Davis]

True, you wouldn't be able to modify the auth.User model.   Though you're
wrong about what would happen if you were able to.  What I'm saying is with
a ManyToMany field,  the relationship is with itself (User),  so it would
return User objects.

The django docs suggest using a UserProfile model when you need to add more
information about a user:
http://docs.djangoproject.com/en/dev/topics/auth/#storing-additional-information-about-users

What you could do is this.  Create a UserProfile model with the friends
reflexive relationship:

  class UserProfile(models.Model):
  user = ForeignKey(User)
  friends = ManyToManyField(UserProfile)


then you could do:

  some_user = UserProfile.objects.get(user=X)
  his_friends = some_user.friends

This would return UserProfile objects, though.  So if you wanted User
objects, you could do

  his_friends = some_user.friends.select_related('user')

This would pull all this user's friends,  plus their information from the
auth_user table in one query,  so while looping through their friends, you
access their user information like so:

   for friend in his_friends:
   this_friends_user_acct = friend.user



Make sense?

On Thu, Sep 3, 2009 at 10:17 AM, Yanik  wrote:

>
> Well, I can't add very well add fields to the Auth.User. But even if I
> could, user.friends would get me instances of "Friend" model, not
> "User" model.
>
> On Sep 3, 11:13 am, Ben Davis  wrote:
> > It looks you're setting a many-to-many reflexive (circular) relationship
> > between users.   It seems it would be better to add a ManyToManyField on
> the
> > User model, eg:
> >
> > class User(models.Model):
> > ...
> > friends = ManyToManyField(User)
> >
> > Then you could just use "user.friends"
> >
> > On Thu, Sep 3, 2009 at 9:50 AM, Yanik  wrote:
> >
> > > Let's say I have a model "Friends" that looks something like:
> >
> > > class Friend(models.Model):
> > >user = models.ForeignKey(User)
> > >friend = models.ForeignKey(User, related_name="friend")
> >
> > > I want a list of "User" instances of a user's friends. Is my only
> > > option to:
> >
> > > 1) Get list of "Friends"
> > > 2) Then get list of "Users" where id in friends.value_llist('id')
> >
> > > Or is there a way to do a query on the "Friend" model and as to return
> > > "User" instances of friends?
> >
> >
> >
>

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Re: Return FK model

[Yanik]

Well, I can't add very well add fields to the Auth.User. But even if I
could, user.friends would get me instances of "Friend" model, not
"User" model.

On Sep 3, 11:13 am, Ben Davis  wrote:
> It looks you're setting a many-to-many reflexive (circular) relationship
> between users.   It seems it would be better to add a ManyToManyField on the
> User model, eg:
>
> class User(models.Model):
>     ...
>     friends = ManyToManyField(User)
>
> Then you could just use "user.friends"
>
> On Thu, Sep 3, 2009 at 9:50 AM, Yanik  wrote:
>
> > Let's say I have a model "Friends" that looks something like:
>
> > class Friend(models.Model):
> >        user = models.ForeignKey(User)
> >        friend = models.ForeignKey(User, related_name="friend")
>
> > I want a list of "User" instances of a user's friends. Is my only
> > option to:
>
> > 1) Get list of "Friends"
> > 2) Then get list of "Users" where id in friends.value_llist('id')
>
> > Or is there a way to do a query on the "Friend" model and as to return
> > "User" instances of friends?
>
>
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Re: Return FK model

[Ben Davis]

It looks you're setting a many-to-many reflexive (circular) relationship
between users.   It seems it would be better to add a ManyToManyField on the
User model, eg:

class User(models.Model):
...
friends = ManyToManyField(User)


Then you could just use "user.friends"



On Thu, Sep 3, 2009 at 9:50 AM, Yanik  wrote:

>
> Let's say I have a model "Friends" that looks something like:
>
> class Friend(models.Model):
>user = models.ForeignKey(User)
>friend = models.ForeignKey(User, related_name="friend")
>
> I want a list of "User" instances of a user's friends. Is my only
> option to:
>
> 1) Get list of "Friends"
> 2) Then get list of "Users" where id in friends.value_llist('id')
>
> Or is there a way to do a query on the "Friend" model and as to return
> "User" instances of friends?
>
> >
>

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Return FK model

[Yanik]

Let's say I have a model "Friends" that looks something like:

class Friend(models.Model):
user = models.ForeignKey(User)
friend = models.ForeignKey(User, related_name="friend")

I want a list of "User" instances of a user's friends. Is my only
option to:

1) Get list of "Friends"
2) Then get list of "Users" where id in friends.value_llist('id')

Or is there a way to do a query on the "Friend" model and as to return
"User" instances of friends?

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