85 lines
2.8 KiB
Python
85 lines
2.8 KiB
Python
from django.contrib.postgres.fields import JSONField
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from django.contrib.postgres.fields.jsonb import KeyTextTransform
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from django.db import models
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from django.utils.translation import gettext_lazy as _
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from utils.models import ProjectBaseMixin, BaseAttributes
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class NewsType(models.Model):
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"""NewsType model."""
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name = models.CharField(_('name'), max_length=250)
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class Meta:
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verbose_name_plural = _('news types')
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verbose_name = _('news type')
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def __str__(self):
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return self.name
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class NewsManager(models.Manager):
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"""Manager for model News"""
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def annotate_localized_fields(self, locale):
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"""Return queryset by locale"""
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prefix = 'trans'
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# Prepare fields to localization (only JSONField can be localized)
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fields = [field.name for field in self.model._meta.fields if isinstance(field, JSONField)]
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# Check filters to check if field has localization
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filters = {f'{field}__has_key': locale for field in fields}
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# Filter QuerySet by prepared filters
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queryset = self.filter(**filters)
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# Prepare field for annotator
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localized_fields = {f'{field}_{prefix}': KeyTextTransform(f'{locale}', field) for field in fields}
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# Annotate them
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for _ in fields:
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queryset = queryset.annotate(**localized_fields)
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return queryset
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class NewsQuerySet(models.QuerySet):
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"""QuerySet for model News"""
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def by_type(self, news_type):
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"""Filter News by type"""
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return self.filter(news_type__name=news_type)
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class News(BaseAttributes):
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"""News model."""
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news_type = models.ForeignKey(
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NewsType, verbose_name=_('news type'), on_delete=models.CASCADE)
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title = JSONField(
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_('title'), null=True, blank=True,
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default=None, help_text='{"en":"some text"}')
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subtitle = JSONField(
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_('subtitle'), null=True, blank=True,
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default=None, help_text='{"en":"some text"}'
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)
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description = JSONField(
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_('subtitle'), null=True, blank=True,
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default=None, help_text='{"en":"some text"}'
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)
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start = models.DateTimeField(_('start'))
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end = models.DateTimeField(_('end'))
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playlist = models.IntegerField(_('playlist'))
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address = models.ForeignKey(
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'location.Address', verbose_name=_('address'), blank=True,
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null=True, default=None, on_delete=models.CASCADE)
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# TODO: metadata_keys - описание ключей для динамического построения полей метаданных
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# TODO: metadata_values - Описание значений для динамических полей из MetadataKeys
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objects = NewsManager.from_queryset(NewsQuerySet)()
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class Meta:
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verbose_name = _('news')
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verbose_name_plural = _('news')
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def __str__(self):
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return f'news: {self.id}'
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