moacirmoda

try:
    Person.objects.get(id=1)
except ObjectDoesNotExists:
    print('não existe')

moacirmoda

for item in Person.objects.all().values('name'):
    print(item['name'])    

moacirmoda

queryset = Person.objects.all()
for item in queryset:
    print(item.user.name)

moacirmoda

class Page(models.Model):
  url = models.URLField(help_text="Example: '/about/contact/'. Make sure to have leading and trailing slashes.")
  title = models.CharField(max_length=50)
  content = models.TextField(help_text="Full HTML is allowed.")
  

moacirmoda

class Car(models.Model):
    RED = 'r'
    WHITE = 'w'
    BLUE = 'b'

    COLOR_CHOICES = (
        (RED, 'red'),
        (WHITE, 'white'),
        (BLUE, 'blue'),
    )

moacirmoda

class Person(models.Model):
  name = models.CharField(max_length=30)
  is_active = models.NullBooleanField()

moacirmoda

class Person(models.Model):
  name = models.CharField(max_length=30)
  is_active = models.BooleanField(null=True)

moacirmoda

class Article(models.Model):
    reporter = models.OneToOneField(Reporter, on_delete=models.CASCADE)
  

moacirmoda

class Article(models.Model):
    reporter = models.ForeignKey(Reporter, on_delete=models.CASCADE, unique=True)
    

moacirmoda

class Reporter(models.Model):
    # ...
    pass

  
class Article(models.Model):
    reporter = models.ForeignKey(Reporter, on_delete=models.CASCADE, related_query_name='author')
    
    
>>> Article.objects.filter(author__name='Moacir')