Question

let’s start with the model

#models.py
class Project(models.Model):
    owner = models.ForeignKey(User)
    name = models.CharField(max_length=100)

class Issue(models.Model):
    project = models.ForeignKey(Project)
    title = models.CharField(max_length=100)
    status = models.ForeignKey('Status')


class Status(models.Model):
    name= models.CharField(max_length=10, help_text=u'eg open, closed...')
    default = models.BooleanField(default=False)
    project = models.ManyToManyField(Project)

    def save(self, *args, **kwargs):
        if self.default:
            #self.__class__.objects.filter(default=True, project=self.project).update(default=False)
            pass

I’d like to set all default to False when a user selects on another Status the default option. How could I achieve this?

Edit:

A user will be able to create custom Status for his project. So, let’s say the user got 2 Projects – they are called Audi and BMW.

Now the user creates a Status for an Issue. It’s name will be open and he selects it to be default for all Issues within the Project BMW.
All issues within the project BMW will get the default status open. Great!

Now the user creates another Status for an Issue. This time the name will be new and he selects it to be default for all his Projects!

So, what I need is something (with as less queries as possible) that sets the first Status open within BMW to default = false.

Answer 1

    def save(self, *args, **kwargs):
        if self.default:
            for status in Status.objects.filter(default=True,project__in=self.project.all()):
                status.default=False
                status.save()
        super(Status,self).save(*args,**kwargs)