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Thread: Directional Many-to-many
Directional Many-to-many
user name
 2006-08-29 16:15:34 
Hello,

Given this model:

class Person(models.Model):
    name = models.CharField(maxlength=200)
    children = models.ManyToManyField('self')

I can do:
    FatherObj.children.add(ChildObj)

Somehow though, if I go to ChildObj and ask for its
children, I will
get the FatherObj as well. What am I doing wrong?

In my real example, the childObj can have many parent nodes,
thus
many-to-many is required.

Thanks,
Sia


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Directional Many-to-many
user name
 2006-08-29 17:23:25 

  


  

    Take a look at: http://www.djangoproject.com/documentation/models/m2m_and_m2o/

Corey

On Aug 29, 2006, at 12:15 PM, Siah wrote:


Hello,

Given this model:

class Person(models.Model):
    name = models.CharField(maxlength=200)
    children = models.ManyToManyField('self')

I can do:
    FatherObj.children.add(ChildObj)

Somehow though, if I go to ChildObj and ask for its children, I will
get the FatherObj as well. What am I doing wrong?

In my real example, the childObj can have many parent nodes, thus
many-to-many is required.

Thanks,
Sia





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    Directional Many-to-many
  


  

     user name

     2006-08-30 00:17:08
  


  

    

  


  

    

On 8/30/06, Siah <gmail.com">siasookhtehgmail.com> wrote:


Somehow though, if I go to ChildObj and ask for its children, I will
get the FatherObj as well. What am I doing wrong?

By default, m2m fields are symmetrical - what you put in at one end, you can see from the other. 


If you want to make m2m fields non-symmetrical, add symmetrical=False to your m2m definition. See


http://www.djangoproject.com/documentation/models/m2m_recursive/

for an example.

Yours,
Russ Magee %-)

&nbsp;





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