78 lines
2.4 KiB
Python
78 lines
2.4 KiB
Python
# Copyright (C) 2014-2016 Andrey Antukh <niwi@niwi.be>
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# Copyright (C) 2014-2016 Jesús Espino <jespinog@gmail.com>
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# Copyright (C) 2014-2016 David Barragán <bameda@dbarragan.com>
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# This program 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 Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from django.template.defaultfilters import slugify as django_slugify
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import time
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from unidecode import unidecode
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def slugify(value):
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"""
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Return a slug
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"""
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return django_slugify(unidecode(value or ""))
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def slugify_uniquely(value, model, slugfield="slug"):
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"""
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Returns a slug on a name which is unique within a model's table
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"""
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suffix = 0
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potential = base = django_slugify(unidecode(value))
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if len(potential) == 0:
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potential = 'null'
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while True:
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if suffix:
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potential = "-".join([base, str(suffix)])
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if not model.objects.filter(**{slugfield: potential}).exists():
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return potential
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suffix += 1
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def slugify_uniquely_for_queryset(value, queryset, slugfield="slug"):
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"""
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Returns a slug on a name which doesn't exist in a queryset
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"""
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suffix = 0
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potential = base = django_slugify(unidecode(value))
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if len(potential) == 0:
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potential = 'null'
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while True:
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if suffix:
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potential = "-".join([base, str(suffix)])
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if not queryset.filter(**{slugfield: potential}).exists():
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return potential
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suffix += 1
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def ref_uniquely(p, seq_field, model, field='ref'):
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project = p.__class__.objects.select_for_update().get(pk=p.pk)
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ref = getattr(project, seq_field) + 1
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while True:
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params = {field: ref, 'project': project}
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if not model.objects.filter(**params).exists():
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setattr(project, seq_field, ref)
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project.save(update_fields=[seq_field])
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return ref
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time.sleep(0.0002)
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ref += 1
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