|
| 1 | +from django.db import connections, models |
| 2 | +from django.db.models import Max, Q |
| 3 | +from django.utils.timezone import localtime |
| 4 | + |
| 5 | + |
| 6 | +class Campaign(models.Model): |
| 7 | + name = models.TextField() |
| 8 | + start = models.DateTimeField(null=True, blank=True) |
| 9 | + end = models.DateTimeField(null=True, blank=True) |
| 10 | + |
| 11 | + |
| 12 | +class BaseVersionQuerySet(models.QuerySet): |
| 13 | + |
| 14 | + # extra_filters = Q(content__language='en') |
| 15 | + def for_grouper(self, grouper, extra_filters=None): |
| 16 | + if extra_filters is None: |
| 17 | + extra_filters = Q() |
| 18 | + return self.filter( |
| 19 | + Q(extra_filters) & |
| 20 | + Q((self.model.grouper_field, grouper)), |
| 21 | + ) |
| 22 | + |
| 23 | + def _public_qs(self, when=None): |
| 24 | + if when is None: |
| 25 | + when = localtime() |
| 26 | + return self.filter( |
| 27 | + ( |
| 28 | + Q(start__lte=when) | |
| 29 | + Q(campaign__start__lte=when) |
| 30 | + ) & ( |
| 31 | + Q(end__gte=when) | |
| 32 | + Q(end__isnull=True) | |
| 33 | + ( |
| 34 | + Q(campaign__isnull=False) & |
| 35 | + ( |
| 36 | + Q(campaign__end__gte=when) | |
| 37 | + Q(campaign__end__isnull=True) |
| 38 | + ) |
| 39 | + ) |
| 40 | + ) & Q(is_active=True) |
| 41 | + ).order_by('-created') |
| 42 | + |
| 43 | + def public(self, when=None): |
| 44 | + if when is None: |
| 45 | + when = localtime() |
| 46 | + return self._public_qs(when).first() |
| 47 | + |
| 48 | + def distinct_groupers(self): |
| 49 | + if connections[self.db].features.can_distinct_on_fields: |
| 50 | + # ? |
| 51 | + return self.distinct(self.model.grouper_field).order_by('-created') |
| 52 | + else: |
| 53 | + inner = self.values( |
| 54 | + self.model.grouper_field, |
| 55 | + ).annotate(Max('pk')).values('pk__max') |
| 56 | + return self.filter(pk__in=inner) |
| 57 | + |
| 58 | + |
| 59 | +class BaseVersion(models.Model): |
| 60 | + COPIED_FIELDS = ['label', 'campaign', 'start', 'end', 'is_active'] |
| 61 | + |
| 62 | + label = models.TextField() |
| 63 | + campaign = models.ForeignKey( |
| 64 | + Campaign, |
| 65 | + on_delete=models.CASCADE, |
| 66 | + null=True, |
| 67 | + blank=True, |
| 68 | + ) |
| 69 | + created = models.DateTimeField(auto_now_add=True) |
| 70 | + start = models.DateTimeField(null=True, blank=True) |
| 71 | + end = models.DateTimeField(null=True, blank=True) |
| 72 | + is_active = models.BooleanField(default=True) |
| 73 | + |
| 74 | + objects = BaseVersionQuerySet.as_manager() |
| 75 | + |
| 76 | + class Meta: |
| 77 | + abstract = True |
| 78 | + |
| 79 | + def _copy_func_factory(self, name): |
| 80 | + def inner(new): |
| 81 | + related = getattr(self, name) |
| 82 | + related.pk = None |
| 83 | + related.save() |
| 84 | + return related |
| 85 | + return inner |
| 86 | + |
| 87 | + def _get_relation_fields(self): |
| 88 | + """Returns a list of relation fields to copy over. |
| 89 | + If copy_field_order is present, sorts the outcome |
| 90 | + based on the list of field names |
| 91 | + """ |
| 92 | + relation_fields = [ |
| 93 | + f for f in self._meta.get_fields() if |
| 94 | + f.is_relation and |
| 95 | + f.name not in self.COPIED_FIELDS and |
| 96 | + not f.auto_created |
| 97 | + ] |
| 98 | + if getattr(self, 'copy_field_order', None): |
| 99 | + relation_fields = sorted( |
| 100 | + relation_fields, |
| 101 | + key=lambda f: self.copy_field_order.index(f.name), |
| 102 | + ) |
| 103 | + return relation_fields |
| 104 | + |
| 105 | + def copy(self): |
| 106 | + new = self._meta.model(**{ |
| 107 | + f: getattr(self, f) |
| 108 | + for f in self.COPIED_FIELDS |
| 109 | + }) |
| 110 | + m2m_cache = {} |
| 111 | + relation_fields = self._get_relation_fields() |
| 112 | + for f in relation_fields: |
| 113 | + try: |
| 114 | + copy_func = getattr(self, 'copy_{}'.format(f.name)) |
| 115 | + except AttributeError: |
| 116 | + copy_func = self._copy_func_factory(f.name) |
| 117 | + new_value = copy_func(new) |
| 118 | + if f.many_to_many: |
| 119 | + m2m_cache[f.name] = new_value |
| 120 | + else: |
| 121 | + setattr(new, f.name, new_value) |
| 122 | + new.save() |
| 123 | + for field, value in m2m_cache.items(): |
| 124 | + getattr(new, field).set(value) |
| 125 | + return new |
0 commit comments