Querying the reverse side of nullable to_field relation, where both
sides can contain null values resulted in incorrect results. The reason
was not detecting '' as NULL.
Refs #17541
* Renamed the __unicode__ methods
* Applied the python_2_unicode_compatible decorator
* Removed the StrAndUnicode mix-in that is superseded by
python_2_unicode_compatible
* Kept the __unicode__ methods in classes that specifically
test it under Python 2
Previously, you could explicitly assign None to a non-null ForeignKey
(or other) field when creating the model (Child(parent=None), etc). We
now throw an exception when you do that, which matches the behaviour
when you assign None to the attribute after creation.
Thanks to ales.zoulek@gmail.com and ondrej.kohout@gmail.com for some
analysis of this problem.
git-svn-id: http://code.djangoproject.com/svn/django/trunk@9983 bcc190cf-cafb-0310-a4f2-bffc1f526a37
* Model init no longer performs a database query to refetch the related objects it is passed.
* Model init now caches unsaved related objects correctly, too. (Previously, accessing the field would raise `DoesNotExist` error for `null=False` fields.)
* Added tests for assigning `None` to `null=True` `ForeignKey` fields (refs #6886).
git-svn-id: http://code.djangoproject.com/svn/django/trunk@8185 bcc190cf-cafb-0310-a4f2-bffc1f526a37
* Raise a ValueError if you try to assign the wrong type of object.
* Raise a ValueError if you try to assign None to a field not specified with null=True.
* Cache the set value at set time instead of just at lookup time.
This is a slightly backwards-incompatible change; see BackwardsIncompatibleChanges for more details.
git-svn-id: http://code.djangoproject.com/svn/django/trunk@7574 bcc190cf-cafb-0310-a4f2-bffc1f526a37
self-referential and circular relations. A lot of community debugging went into
this fix, so thanks to bmurdock@gmail.com, Marek Kubica, ramiro, Michael
Radziej (the last two giving test cases showing the problem) and James Bennett
(who did the hard work to actually diagnose the true problem and fix it).
git-svn-id: http://code.djangoproject.com/svn/django/trunk@4676 bcc190cf-cafb-0310-a4f2-bffc1f526a37
Anssi Kääriäinen
Alex Gaynor
Aymeric Augustin
Claude Paroz
Alex Gaynor
Russell Keith-Magee
Malcolm Tredinnick
Gary Wilson Jr
Jacob Kaplan-Moss