forum/models/node.py

   1 from base import *
   2 import re
   3 from tag import Tag
   4
   5 import markdown
   6 from django.utils.translation import ugettext as _
   7 from django.utils.safestring import mark_safe
   8 from django.utils.html import strip_tags
   9 from forum.utils.html import sanitize_html
  10 from utils import PickledObjectField
  11
  12 class NodeContent(models.Model):
  13     title      = models.CharField(max_length=300)
  14     tagnames   = models.CharField(max_length=125)
  15     author     = models.ForeignKey(User, related_name='%(class)ss')
  16     body       = models.TextField()
  17
  18     @property
  19     def user(self):
  20         return self.author
  21
  22     @property
  23     def html(self):
  24         return self.body
  25
  26     @classmethod
  27     def _as_markdown(cls, content, *extensions):
  28         try:
  29             return mark_safe(sanitize_html(markdown.markdown(content, extensions=extensions)))
  30         except Exception, e:
  31             import traceback
  32             logging.error("Caught exception %s in markdown parser rendering %s %s:\s %s" % (
  33                 str(e), cls.__name__, str(e), traceback.format_exc()))
  34             return ''
  35
  36     def as_markdown(self, *extensions):
  37         return self._as_markdown(self.body, *extensions)
  38
  39     @property
  40     def headline(self):
  41         return self.title
  42
  43     def tagname_list(self):
  44         if self.tagnames:
  45             t = [name.strip() for name in self.tagnames.split(u' ') if name]
  46             return [name.strip() for name in self.tagnames.split(u' ') if name]
  47         else:
  48             return []
  49
  50     def tagname_meta_generator(self):
  51         return u','.join([tag for tag in self.tagname_list()])
  52
  53     class Meta:
  54         abstract = True
  55         app_label = 'forum'
  56
  57 class NodeMetaClass(BaseMetaClass):
  58     types = {}
  59
  60     def __new__(cls, *args, **kwargs):
  61         new_cls = super(NodeMetaClass, cls).__new__(cls, *args, **kwargs)
  62
  63         if not new_cls._meta.abstract and new_cls.__name__ is not 'Node':
  64             NodeMetaClass.types[new_cls.get_type()] = new_cls
  65
  66         return new_cls
  67
  68     @classmethod
  69     def setup_relations(cls):
  70         for node_cls in NodeMetaClass.types.values():
  71             NodeMetaClass.setup_relation(node_cls)
  72
  73     @classmethod
  74     def setup_relation(cls, node_cls):
  75         name = node_cls.__name__.lower()
  76
  77         def children(self):
  78             return node_cls.objects.filter(parent=self)
  79
  80         def parent(self):
  81             if (self.parent is not None) and self.parent.node_type == name:
  82                 return self.parent.leaf
  83
  84             return None
  85
  86         Node.add_to_class(name + 's', property(children))
  87         Node.add_to_class(name, property(parent))
  88
  89
  90 class NodeQuerySet(CachedQuerySet):
  91     def obj_from_datadict(self, datadict):
  92         cls = NodeMetaClass.types.get(datadict.get("node_type", ""), None)
  93         if cls:
  94             obj = cls()
  95             obj.__dict__.update(datadict)
  96             return obj
  97         else:
  98             return super(NodeQuerySet, self).obj_from_datadict(datadict)
  99
 100     def get(self, *args, **kwargs):
 101         node = super(NodeQuerySet, self).get(*args, **kwargs).leaf
 102
 103         if not isinstance(node, self.model):
 104             raise self.model.DoesNotExist()
 105
 106         return node
 107
 108     def any_state(self, *args):
 109         filter = None
 110
 111         for s in args:
 112             s_filter = models.Q(state_string__contains="(%s)" % s)
 113             filter = filter and (filter | s_filter) or s_filter
 114
 115         if filter:
 116             return self.filter(filter)
 117         else:
 118             return self
 119
 120     def all_states(self, *args):
 121         filter = None
 122
 123         for s in args:
 124             s_filter = models.Q(state_string__contains="(%s)" % s)
 125             filter = filter and (filter & s_filter) or s_filter
 126
 127         if filter:
 128             return self.filter(filter)
 129         else:
 130             return self
 131
 132     def filter_state(self, **kwargs):
 133         apply_bool = lambda q, b: b and q or ~q
 134         return self.filter(*[apply_bool(models.Q(state_string__contains="(%s)" % s), b) for s, b in kwargs.items()])
 135
 136     def children_count(self, child_type):
 137         return NodeMetaClass.types[child_type].objects.filter_state(deleted=False).filter(parent__in=self).count()
 138
 139
 140 class NodeManager(CachedManager):
 141     use_for_related_fields = True
 142
 143     def get_query_set(self):
 144         qs = NodeQuerySet(self.model)
 145
 146         if self.model is not Node:
 147             return qs.filter(node_type=self.model.get_type())
 148         else:
 149             return qs
 150
 151     def get_for_types(self, types, *args, **kwargs):
 152         kwargs['node_type__in'] = [t.get_type() for t in types]
 153         return self.get(*args, **kwargs)
 154
 155     def filter_state(self, **kwargs):
 156         return self.all().filter_state(**kwargs)
 157
 158
 159 class NodeStateDict(object):
 160     def __init__(self, node):
 161         self.__dict__['_node'] = node
 162
 163     def __getattr__(self, name):
 164         if self.__dict__.get(name, None):
 165             return self.__dict__[name]
 166
 167         try:
 168             node = self.__dict__['_node']
 169             action = NodeState.objects.get(node=node, state_type=name).action
 170             self.__dict__[name] = action
 171             return action
 172         except:
 173             return None
 174
 175     def __setattr__(self, name, value):
 176         current = self.__getattr__(name)
 177
 178         if value:
 179             if current:
 180                 current.action = value
 181                 current.save()
 182             else:
 183                 node = self.__dict__['_node']
 184                 state = NodeState(node=node, action=value, state_type=name)
 185                 state.save()
 186                 self.__dict__[name] = value
 187
 188                 if not "(%s)" % name in node.state_string:
 189                     node.state_string = "%s(%s)" % (node.state_string, name)
 190                     node.save()
 191         else:
 192             if current:
 193                 node = self.__dict__['_node']
 194                 node.state_string = "".join("(%s)" % s for s in re.findall('\w+', node.state_string) if s != name)
 195                 node.save()
 196                 current.node_state.delete()
 197                 del self.__dict__[name]
 198
 199
 200 class NodeStateQuery(object):
 201     def __init__(self, node):
 202         self.__dict__['_node'] = node
 203
 204     def __getattr__(self, name):
 205         node = self.__dict__['_node']
 206         return "(%s)" % name in node.state_string
 207
 208
 209 class Node(BaseModel, NodeContent):
 210     __metaclass__ = NodeMetaClass
 211
 212     node_type            = models.CharField(max_length=16, default='node')
 213     parent               = models.ForeignKey('Node', related_name='children', null=True)
 214     abs_parent           = models.ForeignKey('Node', related_name='all_children', null=True)
 215
 216     added_at             = models.DateTimeField(default=datetime.datetime.now)
 217     score                 = models.IntegerField(default=0)
 218
 219     state_string          = models.TextField(default='')
 220     last_edited           = models.ForeignKey('Action', null=True, unique=True, related_name="edited_node")
 221
 222     last_activity_by       = models.ForeignKey(User, null=True)
 223     last_activity_at       = models.DateTimeField(null=True, blank=True)
 224
 225     tags                 = models.ManyToManyField('Tag', related_name='%(class)ss')
 226     active_revision       = models.OneToOneField('NodeRevision', related_name='active', null=True)
 227
 228     extra = PickledObjectField()
 229     extra_ref = models.ForeignKey('Node', null=True)
 230     extra_count = models.IntegerField(default=0)
 231
 232     marked = models.BooleanField(default=False)
 233
 234     comment_count = DenormalizedField("children", node_type="comment", canceled=False)
 235     flag_count = DenormalizedField("flags")
 236
 237     friendly_name = _("post")
 238
 239     objects = NodeManager()
 240
 241     def __unicode__(self):
 242         return self.headline
 243
 244     @classmethod
 245     def _generate_cache_key(cls, key, group="node"):
 246         return super(Node, cls)._generate_cache_key(key, group)
 247
 248     @classmethod
 249     def get_type(cls):
 250         return cls.__name__.lower()
 251
 252     @property
 253     def leaf(self):
 254         leaf_cls = NodeMetaClass.types.get(self.node_type, None)
 255
 256         if leaf_cls is None:
 257             return self
 258
 259         leaf = leaf_cls()
 260         leaf.__dict__ = self.__dict__
 261         return leaf
 262
 263     @property
 264     def nstate(self):
 265         state = self.__dict__.get('_nstate', None)
 266
 267         if state is None:
 268             state = NodeStateDict(self)
 269             self._nstate = state
 270
 271         return state
 272
 273     @property
 274     def nis(self):
 275         nis = self.__dict__.get('_nis', None)
 276
 277         if nis is None:
 278             nis = NodeStateQuery(self)
 279             self._nis = nis
 280
 281         return nis
 282
 283     @property
 284     def last_activity(self):
 285         try:
 286             return self.actions.order_by('-action_date')[0].action_date
 287         except:
 288             return self.last_seen
 289
 290     @property
 291     def state_list(self):
 292         return [s.state_type for s in self.states.all()]
 293
 294     @property
 295     def deleted(self):
 296         return self.nis.deleted
 297
 298     @property
 299     def absolute_parent(self):
 300         if not self.abs_parent_id:
 301             return self
 302
 303         return self.abs_parent
 304
 305     @property
 306     def summary(self):
 307         return strip_tags(self.html)[:300]
 308
 309     @models.permalink
 310     def get_revisions_url(self):
 311         return ('revisions', (), {'id': self.id})
 312
 313     def update_last_activity(self, user, save=False, time=None):
 314         if not time:
 315             time = datetime.datetime.now()
 316
 317         self.last_activity_by = user
 318         self.last_activity_at = time
 319
 320         if self.parent:
 321             self.parent.update_last_activity(user, save=True, time=time)
 322
 323         if save:
 324             self.save()
 325
 326     def _create_revision(self, user, number, **kwargs):
 327         revision = NodeRevision(author=user, revision=number, node=self, **kwargs)
 328         revision.save()
 329         return revision
 330
 331     def create_revision(self, user, **kwargs):
 332         number = self.revisions.aggregate(last=models.Max('revision'))['last'] + 1
 333         revision = self._create_revision(user, number, **kwargs)
 334         self.activate_revision(user, revision)
 335         return revision
 336
 337     def activate_revision(self, user, revision, *extensions):
 338         self.title = revision.title
 339         self.tagnames = revision.tagnames
 340         self.body = self._as_markdown(revision.body, *extensions)
 341
 342         self.active_revision = revision
 343         self.update_last_activity(user)
 344
 345         self.save()
 346
 347     def _list_changes_in_tags(self):
 348         dirty = self.get_dirty_fields()
 349
 350         if not 'tagnames' in dirty:
 351             return None
 352         else:
 353             if self._original_state['tagnames']:
 354                 old_tags = set(name for name in self._original_state['tagnames'].split(u' '))
 355             else:
 356                 old_tags = set()
 357             new_tags = set(name for name in self.tagnames.split(u' ') if name)
 358
 359             return dict(
 360                     current=list(new_tags),
 361                     added=list(new_tags - old_tags),
 362                     removed=list(old_tags - new_tags)
 363                     )
 364
 365     def _last_active_user(self):
 366         return self.last_edited and self.last_edited.by or self.author
 367
 368     def _process_changes_in_tags(self):
 369         tag_changes = self._list_changes_in_tags()
 370
 371         if tag_changes is not None:
 372             for name in tag_changes['added']:
 373                 try:
 374                     tag = Tag.objects.get(name=name)
 375                 except:
 376                     tag = Tag.objects.create(name=name, created_by=self._last_active_user())
 377
 378                 if not self.nis.deleted:
 379                     tag.add_to_usage_count(1)
 380                     tag.save()
 381
 382             if not self.nis.deleted:
 383                 for name in tag_changes['removed']:
 384                     try:
 385                         tag = Tag.objects.get(name=name)
 386                         tag.add_to_usage_count(-1)
 387                         tag.save()
 388                     except:
 389                         pass
 390
 391             return True
 392
 393         return False
 394
 395     def mark_deleted(self, action):
 396         self.nstate.deleted = action
 397         self.save()
 398
 399         if action:
 400             for tag in self.tags.all():
 401                 tag.add_to_usage_count(-1)
 402                 tag.save()
 403         else:
 404             for tag in Tag.objects.filter(name__in=self.tagname_list()):
 405                 tag.add_to_usage_count(1)
 406                 tag.save()
 407
 408     def delete(self, *args, **kwargs):
 409         self.active_revision = None
 410         self.save()
 411
 412         for n in self.children.all():
 413             n.delete()
 414
 415         for a in self.actions.all():
 416             a.cancel()
 417
 418         super(Node, self).delete(*args, **kwargs)
 419
 420     def save(self, *args, **kwargs):
 421         tags_changed = self._process_changes_in_tags()
 422
 423         if not self.id:
 424             self.node_type = self.get_type()
 425             super(BaseModel, self).save(*args, **kwargs)
 426             self.active_revision = self._create_revision(self.author, 1, title=self.title, tagnames=self.tagnames,
 427                                                          body=self.body)
 428             self.activate_revision(self.author, self.active_revision)
 429             self.update_last_activity(self.author, time=self.added_at)
 430
 431         if self.parent_id and not self.abs_parent_id:
 432             self.abs_parent = self.parent.absolute_parent
 433
 434         super(Node, self).save(*args, **kwargs)
 435         if tags_changed: self.tags = list(Tag.objects.filter(name__in=self.tagname_list()))
 436
 437     class Meta:
 438         app_label = 'forum'
 439
 440
 441 class NodeRevision(BaseModel, NodeContent):
 442     node       = models.ForeignKey(Node, related_name='revisions')
 443     summary    = models.CharField(max_length=300)
 444     revision   = models.PositiveIntegerField()
 445     revised_at = models.DateTimeField(default=datetime.datetime.now)
 446
 447     class Meta:
 448         unique_together = ('node', 'revision')
 449         app_label = 'forum'
 450
 451
 452 class NodeState(models.Model):
 453     node       = models.ForeignKey(Node, related_name='states')
 454     state_type = models.CharField(max_length=16)
 455     action     = models.OneToOneField('Action', related_name="node_state")
 456
 457     class Meta:
 458         unique_together = ('node', 'state_type')
 459         app_label = 'forum'
 460
 461