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Fixed #15566 - Documented that update() doesn't honor DateField.auto_now 

Thanks Shabda Raaj for the draft patch.
This commit is contained in:
Tim Graham 2012-09-08 06:38:41 -04:00
parent 09a99714c0
commit dc01e41d23
2 changed files with 10 additions and 9 deletions
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8
docs/howto/custom-model-fields.txt
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@ -181,10 +181,10 @@ card values plus their suits; 104 characters in total.
Many of Django's model fields accept options that they don't do anything Many of Django's model fields accept options that they don't do anything
with. For example, you can pass both with. For example, you can pass both
:attr:`~django.db.models.Field.editable` and :attr:`~django.db.models.Field.editable` and
:attr:`~django.db.models.Field.auto_now` to a :attr:`~django.db.models.DateField.auto_now` to a
:class:`django.db.models.DateField` and it will simply ignore the :class:`django.db.models.DateField` and it will simply ignore the
:attr:`~django.db.models.Field.editable` parameter :attr:`~django.db.models.Field.editable` parameter
(:attr:`~django.db.models.Field.auto_now` being set implies (:attr:`~django.db.models.DateField.auto_now` being set implies
``editable=False``). No error is raised in this case. ``editable=False``). No error is raised in this case.
This behavior simplifies the field classes, because they don't need to This behavior simplifies the field classes, because they don't need to
@ -516,8 +516,8 @@ for the first time, the ``add`` parameter will be ``True``, otherwise it will be
You only need to override this method if you want to preprocess the value You only need to override this method if you want to preprocess the value
somehow, just before saving. For example, Django's somehow, just before saving. For example, Django's
:class:`~django.db.models.DateTimeField` uses this method to set the attribute :class:`~django.db.models.DateTimeField` uses this method to set the attribute
correctly in the case of :attr:`~django.db.models.Field.auto_now` or correctly in the case of :attr:`~django.db.models.DateField.auto_now` or
:attr:`~django.db.models.Field.auto_now_add`. :attr:`~django.db.models.DateField.auto_now_add`.
If you do override this method, you must return the value of the attribute at If you do override this method, you must return the value of the attribute at
the end. You should also update the model's attribute if you make any changes the end. You should also update the model's attribute if you make any changes

11
docs/topics/db/queries.txt
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@ -968,11 +968,12 @@ Be aware that the ``update()`` method is converted directly to an SQL
statement. It is a bulk operation for direct updates. It doesn't run any statement. It is a bulk operation for direct updates. It doesn't run any
:meth:`~django.db.models.Model.save` methods on your models, or emit the :meth:`~django.db.models.Model.save` methods on your models, or emit the
``pre_save`` or ``post_save`` signals (which are a consequence of calling ``pre_save`` or ``post_save`` signals (which are a consequence of calling
:meth:`~django.db.models.Model.save`). If you want to save every item in a :meth:`~django.db.models.Model.save`), or honor the
:class:`~django.db.models.query.QuerySet` and make sure that the :attr:`~django.db.models.DateField.auto_now` field option.
:meth:`~django.db.models.Model.save` method is called on each instance, you If you want to save every item in a :class:`~django.db.models.query.QuerySet`
don't need any special function to handle that. Just loop over them and call and make sure that the :meth:`~django.db.models.Model.save` method is called on
:meth:`~django.db.models.Model.save`:: each instance, you don't need any special function to handle that. Just loop
over them and call :meth:`~django.db.models.Model.save`::
for item in my_queryset: for item in my_queryset:
item.save() item.save()