mirror of
https://github.com/jazzband/django-eav2.git
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91 lines
3 KiB
Python
91 lines
3 KiB
Python
#!/usr/bin/env python
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# vim: ai ts=4 sts=4 et sw=4 coding=utf-8
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#
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# This software is derived from EAV-Django originally written and
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# copyrighted by Andrey Mikhaylenko <http://pypi.python.org/pypi/eav-django>
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#
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# This is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This software is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with EAV-Django. If not, see <http://gnu.org/licenses/>.
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'''
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******
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fields
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******
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Contains two custom fields:
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* :class:`EavSlugField`
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* :class:`EavDatatypeField`
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Classes
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-------
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'''
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import uuid
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import re
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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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from django.core.exceptions import ValidationError
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class EavSlugField(models.SlugField):
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'''
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The slug field used by :class:`~eav.models.Attribute`
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'''
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def validate(self, value, instance):
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'''
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Slugs are used to convert the Python attribute name to a database
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lookup and vice versa. We need it to be a valid Python identifier.
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We don't want it to start with a '_', underscore will be used
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var variables we don't want to be saved in db.
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'''
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super(EavSlugField, self).validate(value, instance)
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slug_regex = r'[a-z][a-z0-9_]*'
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if not re.match(slug_regex, value):
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raise ValidationError(_(u"Must be all lower case, " \
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u"start with a letter, and contain " \
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u"only letters, numbers, or underscores."))
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@staticmethod
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def create_slug_from_name(name):
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'''
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Creates a slug based on the name
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'''
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name = name.strip().lower()
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# Change spaces to underscores
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name = '_'.join(name.split())
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# Remove non alphanumeric characters
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return re.sub('[^\w]', '', name)
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class EavDatatypeField(models.CharField):
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'''
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The datatype field used by :class:`~eav.models.Attribute`
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'''
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def validate(self, value, instance):
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'''
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Raise ``ValidationError`` if they try to change the datatype of an
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:class:`~eav.models.Attribute` that is already used by
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:class:`~eav.models.Value` objects.
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'''
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super(EavDatatypeField, self).validate(value, instance)
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from .models import Attribute
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if not instance.pk:
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return
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if instance.value_set.count():
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raise ValidationError(_(u"You cannot change the datatype of an "
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u"attribute that is already in use."))
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