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87 lines
2.4 KiB
Python
87 lines
2.4 KiB
Python
'''
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Validtors.
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This module contains a validator for each Attribute datatype.
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A validator is a callable that takes a value and raises a ``ValidationError``
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if it doesn’t meet some criteria. (see
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`django validators <http://docs.djangoproject.com/en/dev/ref/validators/>`_)
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These validators are called by the
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:meth:`~eav.models.Attribute.validate_value` method in the
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:class:`~eav.models.Attribute` model.
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'''
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import datetime
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from django.core.exceptions import ValidationError
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from django.db import models
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from django.utils.translation import ugettext_lazy as _
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def validate_text(value):
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'''
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Raises ``ValidationError`` unless *value* type is ``str`` or ``unicode``
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'''
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if not isinstance(value, str):
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raise ValidationError(_(u"Must be str or unicode"))
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def validate_float(value):
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'''
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Raises ``ValidationError`` unless *value* can be cast as a ``float``
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'''
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try:
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float(value)
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except ValueError:
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raise ValidationError(_(u"Must be a float"))
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def validate_int(value):
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'''
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Raises ``ValidationError`` unless *value* can be cast as an ``int``
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'''
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try:
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int(value)
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except ValueError:
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raise ValidationError(_(u"Must be an integer"))
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def validate_date(value):
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'''
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Raises ``ValidationError`` unless *value* is an instance of ``datetime``
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or ``date``
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'''
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if not isinstance(value, datetime.datetime) and not isinstance(value, datetime.date):
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raise ValidationError(_(u"Must be a date or datetime"))
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def validate_bool(value):
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'''
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Raises ``ValidationError`` unless *value* type is ``bool``
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'''
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if not isinstance(value, bool):
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raise ValidationError(_(u"Must be a boolean"))
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def validate_object(value):
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'''
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Raises ``ValidationError`` unless *value* is a saved
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django model instance.
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'''
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if not isinstance(value, models.Model):
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raise ValidationError(_(u"Must be a django model object instance"))
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if not value.pk:
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raise ValidationError(_(u"Model has not been saved yet"))
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def validate_enum(value):
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'''
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Raises ``ValidationError`` unless *value* is a saved
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:class:`~eav.models.EnumValue` model instance.
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'''
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from .models import EnumValue
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if not isinstance(value, EnumValue):
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raise ValidationError(_(u"Must be an EnumValue model object instance"))
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if not value.pk:
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raise ValidationError(_(u"EnumValue has not been saved yet"))
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