Python-сообщество

megoloman · Май 16, 2016 11:50:49

Здравтсвуйте! Помогите пожалуйста с тестовым заданием, необходимо выбрать правильные ответы.

1. Suppose we have model with a custom manager:

class CustomManager(models.Manager):
    def get_queryset(self):
        return CustomQuerySet(self.model, using=self._db)
class Item(models.Model):
    name = models.CharField('Item', max_length=100)
    active = models.BooleanField('Active', default=True)
    objects = CustomManager()

Now we want the following code to work:

Item.objects.filter(pk=1).delete()

- should set “active” attribute to False on matched records.

Item.objects.filter(pk=1).delete_real()

- should delete matched records from db.

What is the correct CustomQuerySet implementation?

i.

class CustomQuerySet(QuerySet):
    def delete(self):
        self.update(active=False)
    def delete_real(self):
        super(CustomQuerySet, self).delete_real()

ii.

class CustomQuerySet(QuerySet):
    def delete(self):
        self.update(active=False)
    def delete_real(self):
        super(CustomQuerySet, self).delete()

iii.

class CustomQuerySet(QuerySet):
    def delete(self):
        self.active = False
    def delete_real(self):
        super(CustomQuerySet, self).delete()

iv.

class CustomQuerySet(QuerySet):
    def delete(self):
        self.active = False
    def delete_real(self):
        super(CustomQuerySet, self).delete_real()

2. Suppose we have model:

class Person(models.Model):
    name = models.CharField('Item', max_length=100)
    birthday = models.DateField(...)

We want to define a model field “birthday” such that django admin interface doesn't allow this field to be empty, but we can create persons with empty birthday using orm (

Person.objects.create(name='Name 1')

should work).

What is the correct field definition?
i.

birthday = models.DateField(null=True, blank=True)

ii.

birthday = models.DateField(null=False, blank=True)

iii.

birthday = models.DateField(null=True, blank=False)

iv.

birthday = models.DateField(null=False, blank=False)

Отредактировано megoloman (Май 16, 2016 11:51:42)

Python-сообщество

Уведомления

#1 Май 16, 2016 11:50:49

Django ORM

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