"""

33. get_or_create()

get_or_create() does what it says: it tries to look up an object with the given

parameters. If an object isn't found, it creates one with the given parameters.

"""

from django.db import models

class Person(models.Model):

    first_name = models.CharField(maxlength=100)

    last_name = models.CharField(maxlength=100)

    birthday = models.DateField()

    def __str__(self):

        return '%s %s' % (self.first_name, self.last_name)

__test__ = {'API_TESTS':"""

# Acting as a divine being, create an Person.

>>> from datetime import date

>>> p = Person(first_name='John', last_name='Lennon', birthday=date(1940, 10, 9))

>>> p.save()

# Only one Person is in the database at this point.

>>> Person.objects.count()

1

# get_or_create() a person with similar first names.

>>> p, created = Person.objects.get_or_create(first_name='John', last_name='Lennon', defaults={'birthday': date(1940, 10, 9)})

# get_or_create() didn't have to create an object.

>>> created

False

# There's still only one Person in the database.

>>> Person.objects.count()

1

# get_or_create() a Person with a different name.

>>> p, created = Person.objects.get_or_create(first_name='George', last_name='Harrison', defaults={'birthday': date(1943, 2, 25)})

>>> created

True

>>> Person.objects.count()

2

# If we execute the exact same statement, it won't create a Person.

>>> p, created = Person.objects.get_or_create(first_name='George', last_name='Harrison', defaults={'birthday': date(1943, 2, 25)})

>>> created

False

>>> Person.objects.count()

2

"""}