Re: Comparing two ManyToMany fields for same entries

Just thought I'd add another example using Python script:

Person0 = Person()
Person1 = Person()
Person2 = Person()
Person0.friends.add(Person2)
Person2.friends.add(Person0)
Person2.friends.add(Person1)
Person1.friends.add(Person2)

Now, I would like to do the following, but it seems to fail:

Person0.friends.all() in Person1.friends.all(). I would like it to
say if Person0 and Person1 share another friend in common.

Person0 and Person2 are friends
Person1 and Person2 are friends
Person0 and Person1 are NOT friends, but share a friend in common.
How does one find out that even though Person0 and Person1 are not
friends, they do share Person2 as a friend.

I can use my eye on a Python shell to see that Person2 exists on both
Peson0 and Person1, but how does one make the code see it?

Sorry for having to clarify this so much, I'm just not sure that my
last post actually explained it properly.

Thanks.

On Oct 28, 12:30 pm, Kevin <kveron...@gmail.com> wrote:
> Hello,
>
>   I am building a model which shares a relation with another model
> using a ManyToManyField.  What I need to do, is find out which models
> are on both on two seperate ManyToManyField lists.  Here is a simple
> example of what I am trying to do:
>
> Person:
>   friends=ManyToManyField(self)
>
> To find out this persons direct friends, Person.friends...
> To find out which friends this Person shares in common with another
> Person, ????
>
> Person0:
>   Person1
>   Person6
>   Person3
>   Person8
>
> Person1:
>   Person2
>   Person6
>
> What would be the most optimized QuerySet to find out that both
> Person0 and Person1 are both friends with Person6?
>
> Is there a specific Django app perhaps that can ease develop of this
> type of data relations between objects?
>
> Thanks.

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