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Refs #2217 -- Updated DB API docs to discuss filtering using objects rather than IDs. Second attempt - forgot to save before commit last time.

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git-svn-id: http://code.djangoproject.com/svn/django/trunk@3302 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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Russell Keith-Magee 2006-07-09 03:53:11 +00:00
parent 88189399b1
commit c431ade5f5
1 changed files with 10 additions and 4 deletions
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docs/db-api.txt
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@ -1555,11 +1555,17 @@ of ``INSTALLED_APPS`` is to tell Django the entire model domain.
Queries over related objects
----------------------------
When specifying a query over a related object, you have the option of
b = Blog.objects.get(id=5)
e1 = Entry.objects.filter()
Queries involving related objects follow the same rules as queries involving
normal value fields. When specifying the the value for a query to match, you
may use either an object instance itself, or the primary key value for the
object.
For example, if you have a Blog object ``b`` with ``id=5``, the following
three queries would be identical::
Entry.objects.filter(blog=b) # Query using object instance
Entry.objects.filter(blog=b.id) # Query using id from instance
Entry.objects.filter(blog=5) # Query using id directly
Deleting objects
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