Fixes #13538 -- Clarified query examples with more explicit import statements and model vs. instance differentiation. Thanks to yipengh87@gmail.com and kmtracey for the report, and timo for the patch.
git-svn-id: http://code.djangoproject.com/svn/django/trunk@14070 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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@ -94,18 +94,23 @@ the database until you explicitly call ``save()``.
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Saving ``ForeignKey`` and ``ManyToManyField`` fields
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Saving ``ForeignKey`` and ``ManyToManyField`` fields
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----------------------------------------------------
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----------------------------------------------------
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Updating ``ForeignKey`` fields works exactly the same way as saving a normal
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Updating a ``ForeignKey`` field works exactly the same way as saving a normal
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field; simply assign an object of the right type to the field in question::
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field; simply assign an object of the right type to the field in question.
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This example updates the ``blog`` attribute of an ``Entry`` instance ``entry``::
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>>> from mysite.blog.models import Entry
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>>> entry = Entry.objects.get(pk=1)
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>>> cheese_blog = Blog.objects.get(name="Cheddar Talk")
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>>> cheese_blog = Blog.objects.get(name="Cheddar Talk")
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>>> entry.blog = cheese_blog
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>>> entry.blog = cheese_blog
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>>> entry.save()
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>>> entry.save()
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Updating a ``ManyToManyField`` works a little differently; use the ``add()``
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Updating a ``ManyToManyField`` works a little differently; use the ``add()``
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method on the field to add a record to the relation::
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method on the field to add a record to the relation. This example adds the
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``Author`` instance ``joe`` to the ``entry`` object::
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>> joe = Author.objects.create(name="Joe")
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>>> from mysite.blog.models import Author
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>> entry.authors.add(joe)
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>>> joe = Author.objects.create(name="Joe")
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>>> entry.authors.add(joe)
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Django will complain if you try to assign or add an object of the wrong type.
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Django will complain if you try to assign or add an object of the wrong type.
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