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tests/regressiontests/get_or_create_regress/models.py

 

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from django.db import models

 

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class Publisher(models.Model):

 

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    name = models.CharField(max_length=100)

 

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class Author(models.Model):

 

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    name = models.CharField(max_length=100)

 

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class Book(models.Model):

 

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    name = models.CharField(max_length=100)

 

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    authors = models.ManyToManyField(Author, related_name='books')

 

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    publisher = models.ForeignKey(Publisher, related_name='books')

 

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__test__ = {'one':"""

 

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#

 

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# RelatedManager

 

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#

 

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# First create a Publisher.

 

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>>> p = Publisher.objects.create(name='Acme Publishing')

 

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# Create a book through the publisher.

 

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>>> book, created = p.books.get_or_create(name='The Book of Ed & Fred')

 

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>>> created

 

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True

 

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# The publisher should have one book.

 

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>>> p.books.count()

 

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1

 

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# Try get_or_create again, this time nothing should be created.

 

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>>> book, created = p.books.get_or_create(name='The Book of Ed & Fred')

 

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>>> created

 

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False

 

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# And the publisher should still have one book.

 

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>>> p.books.count()

 

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1

 

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#

 

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# ManyRelatedManager

 

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#

 

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# Add an author to the book.

 

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>>> ed, created = book.authors.get_or_create(name='Ed')

 

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>>> created

 

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True

 

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# Book should have one author.

 

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>>> book.authors.count()

 

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1

 

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# Try get_or_create again, this time nothing should be created.

 

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>>> ed, created = book.authors.get_or_create(name='Ed')

 

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>>> created

 

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False

 

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# And the book should still have one author.

 

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>>> book.authors.count()

 

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1

 

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# Add a second author to the book.

 

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>>> fred, created = book.authors.get_or_create(name='Fred')

 

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>>> created

 

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True

 

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# The book should have two authors now.

 

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>>> book.authors.count()

 

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2

 

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# Create an Author not tied to any books.

 

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>>> Author.objects.create(name='Ted')

 

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<Author: Author object>

 

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# There should be three Authors in total. The book object should have two.

 

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>>> Author.objects.count()

 

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3

 

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>>> book.authors.count()

 

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2

 

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# Try creating a book through an author.

 

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>>> ed.books.get_or_create(name="Ed's Recipies", publisher=p)

 

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(<Book: Book object>, True)

 

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# Now Ed has two Books, Fred just one.

 

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>>> ed.books.count()

 

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2

 

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>>> fred.books.count()

 

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1

 

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"""}

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