Fixed #8679: use full signature of Model.save() in docs and remove no-longer-used 'raw' argument
git-svn-id: http://code.djangoproject.com/svn/django/trunk@8754 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
parent
5e26fceb83
commit
6ba55eee30
|
@ -325,8 +325,8 @@ method::
|
|||
|
||||
class Entry(models.Model):
|
||||
# ...
|
||||
def save(self):
|
||||
super(Entry, self).save()
|
||||
def save(self, force_insert=False, force_update=False):
|
||||
super(Entry, self).save(force_insert, force_update)
|
||||
try:
|
||||
ping_google()
|
||||
except Exception:
|
||||
|
|
|
@ -33,7 +33,7 @@ To save an object back to the database, call ``save()``:
|
|||
|
||||
.. method:: Model.save([force_insert=False, force_update=False])
|
||||
|
||||
Of course, there's some subtleties; see the sections below.
|
||||
Of course, there are some subtleties; see the sections below.
|
||||
|
||||
**New in Django development version:** The signature of the ``save()`` method
|
||||
has changed from earlier versions (``force_insert`` and ``force_update`` have
|
||||
|
@ -144,38 +144,6 @@ When you save an object, Django performs the following steps:
|
|||
is used to provide notification that an object has been successfully
|
||||
saved. (These signals are not yet documented.)
|
||||
|
||||
Raw saves
|
||||
~~~~~~~~~
|
||||
|
||||
**New in Django development version**
|
||||
|
||||
The pre-processing step (#2 in the previous section) is useful, but it modifies
|
||||
the data stored in a field. This can cause problems if you're relying upon the
|
||||
data you provide being used as-is.
|
||||
|
||||
For example, if you're setting up conditions for a test, you'll want the test
|
||||
conditions to be repeatable. If pre-processing is performed, the data used
|
||||
to specify test conditions may be modified, changing the conditions for the
|
||||
test each time the test is run.
|
||||
|
||||
In cases such as this, you need to prevent pre-processing from being performed
|
||||
when you save an object. To do this, you can invoke a **raw save** by passing
|
||||
``raw=True`` as an argument to the ``save()`` method::
|
||||
|
||||
b4.save(raw=True) # Save object, but do no pre-processing
|
||||
|
||||
A raw save skips the usual data pre-processing that is performed during the
|
||||
save. All other steps in the save (pre-save signal, data preparation, data
|
||||
insertion, and post-save signal) are performed as normal.
|
||||
|
||||
.. admonition:: When to use a raw save
|
||||
|
||||
Generally speaking, you shouldn't need to use a raw save. Disabling field
|
||||
pre-processing is an extraordinary measure that should only be required
|
||||
in extraordinary circumstances, such as setting up reliable test
|
||||
conditions.
|
||||
|
||||
|
||||
How Django knows to UPDATE vs. INSERT
|
||||
-------------------------------------
|
||||
|
||||
|
|
|
@ -683,15 +683,16 @@ You're free to override these methods (and any other model method) to alter
|
|||
behavior.
|
||||
|
||||
A classic use-case for overriding the built-in methods is if you want something
|
||||
to happen whenever you save an object. For example::
|
||||
to happen whenever you save an object. For example (see
|
||||
:meth:`~Model.save` for documentation of the parameters it accepts)::
|
||||
|
||||
class Blog(models.Model):
|
||||
name = models.CharField(max_length=100)
|
||||
tagline = models.TextField()
|
||||
|
||||
def save(self):
|
||||
def save(self, force_insert=False, force_update=False):
|
||||
do_something()
|
||||
super(Blog, self).save() # Call the "real" save() method.
|
||||
super(Blog, self).save(force_inset, force_update) # Call the "real" save() method.
|
||||
do_something_else()
|
||||
|
||||
You can also prevent saving::
|
||||
|
@ -700,11 +701,11 @@ You can also prevent saving::
|
|||
name = models.CharField(max_length=100)
|
||||
tagline = models.TextField()
|
||||
|
||||
def save(self):
|
||||
def save(self, force_insert=False, force_update=False):
|
||||
if self.name == "Yoko Ono's blog":
|
||||
return # Yoko shall never have her own blog!
|
||||
else:
|
||||
super(Blog, self).save() # Call the "real" save() method.
|
||||
super(Blog, self).save(force_inset, force_update) # Call the "real" save() method.
|
||||
|
||||
It's important to remember to call the superclass method -- that's that
|
||||
``super(Blog, self).save()`` business -- to ensure that the object still gets
|
||||
|
|
Loading…
Reference in New Issue