# -*- coding: utf-8 -*- # import uuid from django.db import models, transaction from django.db.models import Q from django.utils.translation import ugettext_lazy as _ from django.core.cache import cache from orgs.mixins import OrgModelMixin from orgs.utils import set_current_org, get_current_org from orgs.models import Organization __all__ = ['Node'] class Node(OrgModelMixin): id = models.UUIDField(default=uuid.uuid4, primary_key=True) key = models.CharField(unique=True, max_length=64, verbose_name=_("Key")) # '1:1:1:1' value = models.CharField(max_length=128, verbose_name=_("Value")) child_mark = models.IntegerField(default=0) date_create = models.DateTimeField(auto_now_add=True) is_node = True _full_value_cache_key_prefix = '_NODE_VALUE_{}' class Meta: verbose_name = _("Node") def __str__(self): return self.full_value def __eq__(self, other): return self.key == other.key def __gt__(self, other): if self.is_root(): return True self_key = [int(k) for k in self.key.split(':')] other_key = [int(k) for k in other.key.split(':')] if len(self_key) < len(other_key): return True elif len(self_key) > len(other_key): return False else: return self_key[-1] < other_key[-1] @property def name(self): return self.value @property def full_value(self): key = self._full_value_cache_key_prefix.format(self.key) cached = cache.get(key) if cached: return cached value = self.get_full_value() self.cache_full_value(value) return value def get_full_value(self): # ancestor = [a.value for a in self.get_ancestor(with_self=True)] if self.is_root(): return self.value parent_full_value = self.parent.full_value value = parent_full_value + ' / ' + self.value return value def cache_full_value(self, value): key = self._full_value_cache_key_prefix.format(self.key) cache.set(key, value, 3600) def expire_full_value(self): key = self._full_value_cache_key_prefix.format(self.key) cache.delete_pattern(key+'*') @property def level(self): return len(self.key.split(':')) def get_next_child_key(self): mark = self.child_mark self.child_mark += 1 self.save() return "{}:{}".format(self.key, mark) def create_child(self, value): with transaction.atomic(): child_key = self.get_next_child_key() child = self.__class__.objects.create(key=child_key, value=value) return child def get_children(self, with_self=False): pattern = r'^{0}$|^{}:[0-9]+$' if with_self else r'^{}:[0-9]+$' return self.__class__.objects.filter( key__regex=pattern.format(self.key) ) def get_all_children(self, with_self=False): pattern = r'^{0}$|^{0}:' if with_self else r'^{0}' return self.__class__.objects.filter( key__regex=pattern.format(self.key) ) def get_sibling(self, with_self=False): key = ':'.join(self.key.split(':')[:-1]) pattern = r'^{}:[0-9]+$'.format(key) sibling = self.__class__.objects.filter( key__regex=pattern.format(self.key) ) if not with_self: sibling = sibling.exclude(key=self.key) return sibling def get_family(self): ancestor = self.get_ancestor() children = self.get_all_children() return [*tuple(ancestor), self, *tuple(children)] def get_assets(self): from .asset import Asset if self.is_default_node(): assets = Asset.objects.filter(nodes__isnull=True) else: assets = Asset.objects.filter(nodes__id=self.id) return assets def get_valid_assets(self): return self.get_assets().valid() def get_all_assets(self): from .asset import Asset pattern = r'^{0}$|^{0}:'.format(self.key) args = [] kwargs = {} if self.is_default_node(): args.append(Q(nodes__key__regex=pattern) | Q(nodes=None)) else: kwargs['nodes__key__regex'] = pattern assets = Asset.objects.filter(*args, **kwargs) return assets def get_all_valid_assets(self): return self.get_all_assets().valid() def is_default_node(self): return self.is_root() and self.key == '0' def is_root(self): if self.key.isdigit(): return True else: return False @property def parent_key(self): parent_key = ":".join(self.key.split(":")[:-1]) return parent_key @property def parent(self): if self.is_root(): return self try: parent = self.__class__.objects.get(key=self.parent_key) return parent except Node.DoesNotExist: return self.__class__.root() @parent.setter def parent(self, parent): if not self.is_node: self.key = parent.key + ':fake' return children = self.get_all_children() old_key = self.key with transaction.atomic(): self.key = parent.get_next_child_key() for child in children: child.key = child.key.replace(old_key, self.key, 1) child.save() self.save() def get_ancestor(self, with_self=False): if self.is_root(): root = self.__class__.root() return [root] _key = self.key.split(':') if not with_self: _key.pop() ancestor_keys = [] for i in range(len(_key)): ancestor_keys.append(':'.join(_key)) _key.pop() ancestor = self.__class__.objects.filter( key__in=ancestor_keys ).order_by('key') return ancestor @classmethod def create_root_node(cls): # 如果使用current_org 在set_current_org时会死循环 _current_org = get_current_org() with transaction.atomic(): if _current_org.is_default(): key = '0' else: set_current_org(Organization.root()) org_nodes_roots = cls.objects.filter(key__regex=r'^[0-9]+$') org_nodes_roots_keys = org_nodes_roots.values_list('key', flat=True) or [0] key = str(max([int(k) for k in org_nodes_roots_keys]) + 1) set_current_org(_current_org) root = cls.objects.create(key=key, value=_current_org.name) return root @classmethod def root(cls): root = cls.objects.filter(key__regex=r'^[0-9]+$') if root: return root[0] else: return cls.create_root_node() @classmethod def default_node(cls): defaults = {'value': 'Default'} return cls.objects.get_or_create(defaults=defaults, key='0') @classmethod def get_tree_name_ref(cls): pass @classmethod def generate_fake(cls, count=100): import random for i in range(count): node = random.choice(cls.objects.all()) node.create_child('Node {}'.format(i))