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Fixed #9431 -- Added extra validation for VARCHAR-based fields on MySQL.

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max_length > 255 and unique=True is not permitted. Based on a patch from
adamnelson.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@9650 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Malcolm Tredinnick 2008-12-16 06:43:18 +00:00
parent fddc0c589e
commit b58a260c56
3 changed files with 52 additions and 12 deletions
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17
docs/ref/models/fields.txt
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@ -327,6 +327,13 @@ The admin represents this as an ``<input type="text">`` (a single-line input).
The maximum length (in characters) of the field. The max_length is enforced
at the database level and in Django's validation.
.. note::
If you are writing an application that must be portable to multiple
database backends, you should be aware that there are restrictions on
``max_length`` for some backends. Refer to the :ref:`database backend
notes <ref-databases>` for details.
.. admonition:: MySQL users
If you are using this field with MySQLdb 1.2.2 and the ``utf8_bin``
@ -341,7 +348,8 @@ The admin represents this as an ``<input type="text">`` (a single-line input).
.. class:: CommaSeparatedIntegerField(max_length=None, [**options])
A field of integers separated by commas. As in :class:`CharField`, the
:attr:`~CharField.max_length` argument is required.
:attr:`~CharField.max_length` argument is required and the note about database
portability mentioned there should be heeded.
``DateField``
-------------
@ -654,9 +662,10 @@ Like a :class:`PositiveIntegerField`, but only allows values under a certain
containing only letters, numbers, underscores or hyphens. They're generally used
in URLs.
Like a CharField, you can specify :attr:`~CharField.max_length`. If
:attr:`~CharField.max_length` is not specified, Django will use a default length
of 50.
Like a CharField, you can specify :attr:`~CharField.max_length` (read the note
about database portability and :attr:`~CharField.max_length` in that section,
too). If :attr:`~CharField.max_length` is not specified, Django will use a
default length of 50.
Implies setting :attr:`Field.db_index` to ``True``.