Django model how to add a ManyToManyField on save if condition not reach -

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i have model article contain boolean field.

when add new article, if bool true, want country (which manytomayfield) bet set specific one.

the bool:

global_regions = models.booleanfield('global', default=true)

the manytomany:

article_country = models.manytomanyfield(country, verbose_name=_('country of article'),                                  blank=true, null=true,                                  related_name='country_press_article')

i tried :

def save(self, *args, **kwargs):     if (self.article_url[:4] != "http") , (self.article_url[:5] != "https"):         self.article_url = "https://" + self.article_url     if not self.slug:         self.slug = slugify(self.title)     if self.global_regions == true: #here condition         self.article_country.add(country.objects.get(id=257))     super(article, self).save(*args, **kwargs)

but, expecting, doesn't work.

what should if want work ?


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