nk20/apps/note/models/notes.py

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# -*- mode: python; coding: utf-8 -*-
# Copyright (C) 2018-2019 by BDE ENS Paris-Saclay
# SPDX-License-Identifier: GPL-3.0-or-later
import unicodedata
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from django.conf import settings
from django.core.exceptions import ValidationError
from django.core.validators import RegexValidator
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from django.db import models
from django.utils.translation import gettext_lazy as _
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from polymorphic.models import PolymorphicModel
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"""
Defines each note types
"""
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class Note(PolymorphicModel):
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"""
Gives transactions capabilities. Note is a Polymorphic Model, use as based
for the models :model:`note.NoteUser` and :model:`note.NoteClub`.
A Note principaly store the actual balance of someone/some club.
A Note can be searched find throught an :model:`note.Alias`
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"""
balance = models.IntegerField(
verbose_name=_('account balance'),
help_text=_('in centimes, money credited for this instance'),
default=0,
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)
is_active = models.BooleanField(
_('active'),
default=True,
help_text=_(
'Designates whether this note should be treated as active. '
'Unselect this instead of deleting notes.'
),
)
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display_image = models.ImageField(
verbose_name=_('display image'),
max_length=255,
blank=True,
)
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created_at = models.DateTimeField(
verbose_name=_('created at'),
auto_now_add=True,
)
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class Meta:
verbose_name = _("note")
verbose_name_plural = _("notes")
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def pretty(self):
"""
:return: Pretty name of this note
"""
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return str(self)
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pretty.short_description = _('Note')
def save(self, *args, **kwargs):
"""
Save note with it's alias (called in polymorphic children)
"""
aliases = Alias.objects.filter(name=str(self))
if aliases.exists():
# Alias exists, so check if it is linked to this note
if aliases.first().note != self:
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raise ValidationError(_('This alias is already taken.'))
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# Save note
super().save(*args, **kwargs)
else:
# Alias does not exist yet, so check if it can exist
a = Alias(name=str(self))
a.clean()
# Save note and alias
super().save(*args, **kwargs)
a.note = self
a.save(force_insert=True)
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def clean(self, *args, **kwargs):
"""
Verify alias (simulate save)
"""
aliases = Alias.objects.filter(name=str(self))
if aliases.exists():
# Alias exists, so check if it is linked to this note
if aliases.first().note != self:
raise ValidationError(_('This alias is already taken.'))
else:
# Alias does not exist yet, so check if it can exist
a = Alias(name=str(self))
a.clean()
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class NoteUser(Note):
"""
A :model:`note.Note` associated to an unique :model:`auth.User`.
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"""
user = models.OneToOneField(
settings.AUTH_USER_MODEL,
on_delete=models.PROTECT,
related_name='note',
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verbose_name=_('user'),
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)
class Meta:
verbose_name = _("one's note")
verbose_name_plural = _("users note")
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def __str__(self):
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return str(self.user)
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def pretty(self):
return _("%(user)s's note") % {'user': str(self.user)}
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class NoteClub(Note):
"""
A :model:`note.Note` associated to an unique :model:`member.Club`
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"""
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club = models.OneToOneField(
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'member.Club',
on_delete=models.PROTECT,
related_name='note',
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verbose_name=_('club'),
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)
class Meta:
verbose_name = _("club note")
verbose_name_plural = _("clubs notes")
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def __str__(self):
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return str(self.club)
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def pretty(self):
return _("Note of %(club)s club") % {'club': str(self.club)}
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class NoteSpecial(Note):
"""
A :model:`note.Note` for special accounts, where real money enter or leave the system
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- bank check
- credit card
- bank transfer
- cash
- refund
This Type of Note is not associated to a :model:`auth.User` or :model:`member.Club` .
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"""
special_type = models.CharField(
verbose_name=_('type'),
max_length=255,
unique=True,
)
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class Meta:
verbose_name = _("special note")
verbose_name_plural = _("special notes")
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def __str__(self):
return self.special_type
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class Alias(models.Model):
"""
points toward a :model:`note.NoteUser` or :model;`note.NoteClub` instance.
Alias are unique, but a :model:`note.NoteUser` or :model:`note.NoteClub` can
have multiples aliases.
Aliases name are also normalized, two differents :model:`note.Note` can not
have the same normalized alias, to avoid confusion when referring orally to
it.
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"""
name = models.CharField(
verbose_name=_('name'),
max_length=255,
unique=True,
validators=[
RegexValidator(
regex=settings.ALIAS_VALIDATOR_REGEX,
message=_('Invalid alias')
)
] if settings.ALIAS_VALIDATOR_REGEX else []
)
normalized_name = models.CharField(
max_length=255,
unique=True,
default='',
editable=False
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)
note = models.ForeignKey(
Note,
on_delete=models.PROTECT,
)
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class Meta:
verbose_name = _("alias")
verbose_name_plural = _("aliases")
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def __str__(self):
return self.name
@staticmethod
def normalize(string):
"""
Normalizes a string: removes most diacritics and does casefolding
"""
return ''.join(
char
for char in unicodedata.normalize('NFKD', string.casefold())
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if all(not unicodedata.category(char).startswith(cat)
for cat in {'M', 'P', 'Z', 'C'})
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).casefold()
def save(self, *args, **kwargs):
"""
Handle normalized_name
"""
self.normalized_name = Alias.normalize(self.name)
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if len(self.normalized_name) < 256:
super().save(*args, **kwargs)
def clean(self):
normalized_name = Alias.normalize(self.name)
if len(normalized_name) >= 255:
raise ValidationError(_('Alias too long.'))
try:
if self != Alias.objects.get(normalized_name=normalized_name):
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raise ValidationError(_('An alias with a similar name '
'already exists.'))
except Alias.DoesNotExist:
pass