import os from django.core import exceptions from django.urls import reverse from django.db import models from django.db.models.fields.files import FileField, FieldFile from django.utils.text import capfirst from ..forms.fields import MultiSelectFormField class MultiSelectField(models.CharField): def formfield(self, **kwargs): defaults = { 'required': not self.blank, 'label': capfirst(self.verbose_name), 'help_text': self.help_text, 'choices': self.choices } if self.has_default(): defaults['initial'] = self.get_default() defaults.update(kwargs) return MultiSelectFormField(**defaults) def get_db_prep_value(self, value, connection=None, prepared=False): if isinstance(value, str): return value else: return ','.join(value) def to_python(self, value): if value: if isinstance(value, str): return value.split(',') return value return [] def from_db_value(self, value, expression, connection, context): if value: if isinstance(value, str): return value.split(',') return value return [] def contribute_to_class(self, cls, name): super(MultiSelectField, self).contribute_to_class(cls, name) if self.choices: def func(self, field=name, choices=dict(self.choices)): return ','.join([choices.get(value, value) for value in getattr(self, field)]) setattr(cls, 'get_%s_display' % self.name, func) def validate(self, value, model_instance): if self.choices: arr_choices = self.get_choices_selected(self.get_choices()) for opt_select in value: if (opt_select not in arr_choices): msg = self.error_messages['invalid_choice'] % {'value': opt_select} raise exceptions.ValidationError(msg) def get_choices_selected(self, arr_choices=''): if not arr_choices: return False return [value for value, __ in arr_choices] class NullableCharField(models.CharField): def get_db_prep_value(self, value, connection=None, prepared=False): return value or None class PrivateFieldFile(FieldFile): @property def url(self): self._require_file() app_label = self.instance._meta.app_label model_name = self.instance._meta.object_name.lower() field_name = self.field.name pk = self.instance.pk filename = os.path.basename(self.path) args = [app_label, model_name, field_name, pk, filename] return reverse('private-media', args=args) @property def condition(self): return self.field.condition @property def attachment(self): return self.field.attachment class PrivateFileField(FileField): attr_class = PrivateFieldFile def __init__(self, verbose_name=None, name=None, upload_to='', storage=None, attachment=True, condition=lambda request, instance: request.user.is_superuser, **kwargs): super(PrivateFileField, self).__init__(verbose_name, name, upload_to, storage, **kwargs) self.condition = condition self.attachment = attachment