having an ManyToMany field, and have it optional

[kamilski81]

Is it possible to do:

class GoalTag(models.Model):
goals = models.ManyToManyField(Goal, null=True)

The reason why i ask is that a goal can have many tags, and a tag can
belong to many goals. However, after a tag is input and a user
deletes a goal, the tag should still remain in the databse.

Currently i'm running into issues, and the 'goal' field is required
when I am inputting a tag...can i change this?

Thanks in advance

[Atamert Ölçgen]

On Thursday 11 February 2010 05:18:44 kamilski81 wrote:
> Is it possible to do:
>
> class GoalTag(models.Model):
> goals = models.ManyToManyField(Goal, null=True)

Try blank=True. That null=True is possibly redundant there.

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[iliveinapark]

Both are required for a ForeignKey or ManyToManyField to be empty, ie:

class GoalTag(models.Model):
goals = models.ManyToManyField(Goal, blank=True, null=True,)

[Atamert Ölçgen]

On Thursday 11 February 2010 08:26:10 iliveinapark wrote:
> Both are required for a ForeignKey or ManyToManyField to be empty, ie:
>
> class GoalTag(models.Model):
> goals = models.ManyToManyField(Goal, blank=True, null=True,)

That is not true. Check contrib apps for examples.

[iliveinapark]

I guess you're correct Atamert, though I'm sure this is still the case
for ForeignKey fields, isn't it?