[1.2.X] Fixed #14537 -- Added documentation on where validators can be imported from to Validators Reference docs, and improved Sphinx formatting and metadata. Thanks to rfugger for the report.
Backport of [14331] from trunk. git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14332 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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Gabriel Hurley
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@ -10,8 +10,9 @@ Writing validators
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==================
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A validator is a callable that takes a value and raises a
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``ValidationError`` if it doesn't meet some criteria. Validators can be useful
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for re-using validation logic between different types of fields.
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:exc:`~django.core.exceptions.ValidationError` if it doesn't meet some
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criteria. Validators can be useful for re-using validation logic between
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different types of fields.
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For example, here's a validator that only allows even numbers::
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@ -21,7 +22,7 @@ For example, here's a validator that only allows even numbers::
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if value % 2 != 0:
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raise ValidationError(u'%s is not an even number' % value)
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You can add this to a model field via the field's ``validators``
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You can add this to a model field via the field's :attr:`~django.db.models.Field.validators`
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argument::
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from django.db import models
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@ -44,109 +45,114 @@ See the :doc:`form validation </ref/forms/validation>` for more information on
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how validators are run in forms, and :ref:`Validating objects
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<validating-objects>` for how they're run in models. Note that validators will
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not be run automatically when you save a model, but if you are using a
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``ModelForm``, it will run your validators on any fields that are included in
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your form. See the :doc:`ModelForm documentation </topics/forms/modelforms>`
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for information on how model validation interacts with forms.
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:class:`~django.forms.ModelForm`, it will run your validators on any fields
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that are included in your form. See the
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:doc:`ModelForm documentation </topics/forms/modelforms>` for information on
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how model validation interacts with forms.
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Built-in validators
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===================
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Django has a collection of callable validators for use with model and form
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fields. They're used internally but are available for use with your own fields,
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too. They can be used in addition to, or in lieu of custom ``field.clean()``
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methods.
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The :mod:`django.core.validators` module contains a collection of callable
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validators for use with model and form fields. They're used internally but
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are available for use with your own fields, too. They can be used in addition
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to, or in lieu of custom ``field.clean()`` methods.
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``RegexValidator``
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------------------
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.. class:: RegexValidator(regex, [message=None, code=None])
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.. class:: RegexValidator(regex, message=None, code=None)
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.. attribute:: regex
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.. attribute:: regex
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The regular expression pattern to search for the provided ``value``,
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or a pre-compiled regular expression. Raises a
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:exc:`~django.core.exceptions.ValidationError` with :attr:`.message`
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and :attr:`.code` if no match is found.
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The regular expression pattern to search for the provided ``value``,
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or a pre-compiled regular expression. Raises a ``ValidationError``
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with ``message`` and ``code`` if no match is found.
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.. attribute:: message
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.. attribute:: message=None
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The error message used by :exc:`~django.core.exceptions.ValidationError`
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if validation fails. If no :attr:`.message` is specified, a generic
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``"Enter a valid value"`` message is used. Default value: ``None``.
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The error message used by ``ValidationError`` if validation fails. If no
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``message`` is specified, a generic ``"Enter a valid value"`` message is used.
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.. attribute:: code
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.. attribute:: code=None
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The error code used by ``ValidationError`` if validation fails. If ``code``
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is not specified, ``"invalid"`` is used.
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The error code used by :exc:`~django.core.exceptions.ValidationError`
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if validation fails. If :attr:`.code` is not specified, ``"invalid"``
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is used. Default value: ``None``.
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``URLValidator``
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----------------
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.. class:: URLValidator([verify_exists=False, validator_user_agent=URL_VALIDATOR_USER_AGENT])
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.. class:: URLValidator(verify_exists=False, validator_user_agent=URL_VALIDATOR_USER_AGENT)
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A :class:`RegexValidator` that ensures a value looks like a URL and
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optionally verifies that the URL actually exists (i.e., doesn't return a
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404 status code). Raises an error code of ``'invalid'`` if it doesn't look
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like a URL, and a code of ``'invalid_link'`` if it doesn't exist.
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A ``RegexValidator`` that ensures a value looks like a URL and optionally
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verifies that the URL actually exists (i.e., doesn't return a 404 status code).
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Raises an error code of ``'invalid'`` if it doesn't look like a URL, and a code
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of ``'invalid_link'`` if it doesn't exist.
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.. attribute:: verify_exists
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.. attribute:: verify_exists=False
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Default value: ``False``. If set to ``True``, this validator checks
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that the URL actually exists.
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If ``verify_exists`` is ``True``, this validator checks that the URL actually
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exists.
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.. attribute:: validator_user_agent
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.. attribute:: validator_user_agent=URL_VALIDATOR_USER_AGENT
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If ``verify_exists`` is ``True``, it uses ``validator_user_agent`` as the "User-agent"
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for the request. This defaults to ``settings.URL_VALIDATOR_USER_AGENT``.
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If :attr:`.verify_exists` is ``True``, Django uses the value of
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:attr:`.validator_user_agent` as the "User-agent" for the request. This
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defaults to :setting:`settings.URL_VALIDATOR_USER_AGENT <URL_VALIDATOR_USER_AGENT>`.
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``validate_email``
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------------------
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.. data:: validate_email
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A ``RegexValidator`` instance that ensures a value looks like an e-mail address.
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A :class:`RegexValidator` instance that ensures a value looks like an
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e-mail address.
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``validate_slug``
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-----------------
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.. data:: validate_slug
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A ``RegexValidator`` instance that ensures a value consists of only letters,
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numbers, underscores or hyphens.
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A :class:`RegexValidator` instance that ensures a value consists of only
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letters, numbers, underscores or hyphens.
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``validate_ipv4_address``
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-------------------------
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.. data:: validate_ipv4_address
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A ``RegexValidator`` instance that ensures a value looks like an IPv4 address.
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A :class:`RegexValidator` instance that ensures a value looks like an IPv4
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address.
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``validate_comma_separated_integer_list``
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-----------------------------------------
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.. data:: validate_comma_separated_integer_list
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A ``RegexValidator`` instance that ensures a value is a comma-separated list
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of integers.
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A :class:`RegexValidator` instance that ensures a value is a
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comma-separated list of integers.
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``MaxValueValidator``
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---------------------
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.. class:: MaxValueValidator(max_value)
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Raises a ``ValidationError`` with a code of ``'max_value'`` if ``value`` is
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greater than ``max_value``.
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Raises a :exc:`~django.core.exceptions.ValidationError` with a code of
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``'max_value'`` if ``value`` is greater than ``max_value``.
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``MinValueValidator``
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---------------------
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.. class:: MinValueValidator(min_value)
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Raises a ``ValidationError`` with a code of ``'min_value'`` if ``value`` is
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less than ``min_value``.
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Raises a :exc:`~django.core.exceptions.ValidationError` with a code of
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``'min_value'`` if ``value`` is less than ``min_value``.
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``MaxLengthValidator``
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----------------------
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.. class:: MaxLengthValidator(max_length)
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Raises a ``ValidationError`` with a code of ``'max_length'`` if the length of
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``value`` is greater than ``max_length``.
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Raises a :exc:`~django.core.exceptions.ValidationError` with a code of
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``'max_length'`` if the length of ``value`` is greater than ``max_length``.
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``MinLengthValidator``
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----------------------
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.. class:: MinLengthValidator(min_length)
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Raises a ``ValidationError`` with a code of ``'min_length'`` if the length of
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``value`` is less than ``min_length``.
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Raises a :exc:`~django.core.exceptions.ValidationError` with a code of
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``'min_length'`` if the length of ``value`` is less than ``min_length``.
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@ -2,8 +2,14 @@
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Creating forms from models
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==========================
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.. module:: django.forms.models
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:synopsis: ModelForm and ModelFormset.
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.. currentmodule:: django.forms
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``ModelForm``
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=============
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.. class:: ModelForm
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If you're building a database-driven app, chances are you'll have forms that
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map closely to Django models. For instance, you might have a ``BlogComment``
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