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.userlinking import auto_user_link
  10 from forum.utils.html import sanitize_html
  11 from utils import PickledObjectField
  12
  13 class NodeContent(models.Model):
  14     title      = models.CharField(max_length=300)
  15     tagnames   = models.CharField(max_length=125)
  16     author     = models.ForeignKey(User, related_name='%(class)ss')
  17     body       = models.TextField()
  18
  19     @property
  20     def user(self):
  21         return self.author
  22
  23     @property
  24     def html(self):
  25         return self.body
  26
  27     @classmethod
  28     def _as_markdown(cls, content, *extensions):
  29         try:
  30             return mark_safe(sanitize_html(markdown.markdown(content, extensions=extensions)))
  31         except Exception, e:
  32             import traceback
  33             logging.error("Caught exception %s in markdown parser rendering %s %s:\s %s" % (
  34                 str(e), cls.__name__, str(e), traceback.format_exc()))
  35             return ''
  36
  37     def as_markdown(self, *extensions):
  38         return self._as_markdown(self.body, *extensions)
  39
  40     @property
  41     def headline(self):
  42         return self.title
  43
  44     def tagname_list(self):
  45         if self.tagnames:
  46             t = [name.strip() for name in self.tagnames.split(u' ') if name]
  47             return [name.strip() for name in self.tagnames.split(u' ') if name]
  48         else:
  49             return []
  50
  51     def tagname_meta_generator(self):
  52         return u','.join([tag for tag in self.tagname_list()])
  53
  54     class Meta:
  55         abstract = True
  56         app_label = 'forum'
  57
  58 class NodeMetaClass(BaseMetaClass):
  59     types = {}
  60
  61     def __new__(cls, *args, **kwargs):
  62         new_cls = super(NodeMetaClass, cls).__new__(cls, *args, **kwargs)
  63
  64         if not new_cls._meta.abstract and new_cls.__name__ is not 'Node':
  65             NodeMetaClass.types[new_cls.get_type()] = new_cls
  66
  67         return new_cls
  68
  69     @classmethod
  70     def setup_relations(cls):
  71         for node_cls in NodeMetaClass.types.values():
  72             NodeMetaClass.setup_relation(node_cls)
  73
  74     @classmethod
  75     def setup_relation(cls, node_cls):
  76         name = node_cls.__name__.lower()
  77
  78         def children(self):
  79             return node_cls.objects.filter(parent=self)
  80
  81         def parent(self):
  82             if (self.parent is not None) and self.parent.node_type == name:
  83                 return self.parent.leaf
  84
  85             return None
  86
  87         Node.add_to_class(name + 's', property(children))
  88         Node.add_to_class(name, property(parent))
  89
  90
  91 class NodeQuerySet(CachedQuerySet):
  92     def obj_from_datadict(self, datadict):
  93         cls = NodeMetaClass.types.get(datadict.get("node_type", ""), None)
  94         if cls:
  95             obj = cls()
  96             obj.__dict__.update(datadict)
  97             return obj
  98         else:
  99             return super(NodeQuerySet, self).obj_from_datadict(datadict)
 100
 101     def get(self, *args, **kwargs):
 102         node = super(NodeQuerySet, self).get(*args, **kwargs).leaf
 103
 104         if not isinstance(node, self.model):
 105             raise self.model.DoesNotExist()
 106
 107         return node
 108
 109     def any_state(self, *args):
 110         filter = None
 111
 112         for s in args:
 113             s_filter = models.Q(state_string__contains="(%s)" % s)
 114             filter = filter and (filter | s_filter) or s_filter
 115
 116         if filter:
 117             return self.filter(filter)
 118         else:
 119             return self
 120
 121     def all_states(self, *args):
 122         filter = None
 123
 124         for s in args:
 125             s_filter = models.Q(state_string__contains="(%s)" % s)
 126             filter = filter and (filter & s_filter) or s_filter
 127
 128         if filter:
 129             return self.filter(filter)
 130         else:
 131             return self
 132
 133     def filter_state(self, **kwargs):
 134         apply_bool = lambda q, b: b and q or ~q
 135         return self.filter(*[apply_bool(models.Q(state_string__contains="(%s)" % s), b) for s, b in kwargs.items()])
 136
 137     def children_count(self, child_type):
 138         return NodeMetaClass.types[child_type].objects.filter_state(deleted=False).filter(parent__in=self).count()
 139
 140
 141 class NodeManager(CachedManager):
 142     use_for_related_fields = True
 143
 144     def get_query_set(self):
 145         qs = NodeQuerySet(self.model)
 146
 147         if self.model is not Node:
 148             return qs.filter(node_type=self.model.get_type())
 149         else:
 150             return qs
 151
 152     def get_for_types(self, types, *args, **kwargs):
 153         kwargs['node_type__in'] = [t.get_type() for t in types]
 154         return self.get(*args, **kwargs)
 155
 156     def filter_state(self, **kwargs):
 157         return self.all().filter_state(**kwargs)
 158
 159
 160 class NodeStateDict(object):
 161     def __init__(self, node):
 162         self.__dict__['_node'] = node
 163
 164     def __getattr__(self, name):
 165         if self.__dict__.get(name, None):
 166             return self.__dict__[name]
 167
 168         try:
 169             node = self.__dict__['_node']
 170             action = NodeState.objects.get(node=node, state_type=name).action
 171             self.__dict__[name] = action
 172             return action
 173         except:
 174             return None
 175
 176     def __setattr__(self, name, value):
 177         current = self.__getattr__(name)
 178
 179         if value:
 180             if current:
 181                 current.action = value
 182                 current.save()
 183             else:
 184                 node = self.__dict__['_node']
 185                 state = NodeState(node=node, action=value, state_type=name)
 186                 state.save()
 187                 self.__dict__[name] = value
 188
 189                 if not "(%s)" % name in node.state_string:
 190                     node.state_string = "%s(%s)" % (node.state_string, name)
 191                     node.save()
 192         else:
 193             if current:
 194                 node = self.__dict__['_node']
 195                 node.state_string = "".join("(%s)" % s for s in re.findall('\w+', node.state_string) if s != name)
 196                 node.save()
 197                 current.node_state.delete()
 198                 del self.__dict__[name]
 199
 200
 201 class NodeStateQuery(object):
 202     def __init__(self, node):
 203         self.__dict__['_node'] = node
 204
 205     def __getattr__(self, name):
 206         node = self.__dict__['_node']
 207         return "(%s)" % name in node.state_string
 208
 209
 210 class Node(BaseModel, NodeContent):
 211     __metaclass__ = NodeMetaClass
 212
 213     node_type            = models.CharField(max_length=16, default='node')
 214     parent               = models.ForeignKey('Node', related_name='children', null=True)
 215     abs_parent           = models.ForeignKey('Node', related_name='all_children', null=True)
 216
 217     added_at             = models.DateTimeField(default=datetime.datetime.now)
 218     score                 = models.IntegerField(default=0)
 219
 220     state_string          = models.TextField(default='')
 221     last_edited           = models.ForeignKey('Action', null=True, unique=True, related_name="edited_node")
 222
 223     last_activity_by       = models.ForeignKey(User, null=True)
 224     last_activity_at       = models.DateTimeField(null=True, blank=True)
 225
 226     tags                 = models.ManyToManyField('Tag', related_name='%(class)ss')
 227     active_revision       = models.OneToOneField('NodeRevision', related_name='active', null=True)
 228
 229     extra = PickledObjectField()
 230     extra_ref = models.ForeignKey('Node', null=True)
 231     extra_count = models.IntegerField(default=0)
 232
 233     marked = models.BooleanField(default=False)
 234
 235     comment_count = DenormalizedField("children", node_type="comment", canceled=False)
 236     flag_count = DenormalizedField("flags")
 237
 238     friendly_name = _("post")
 239
 240     objects = NodeManager()
 241
 242     def __unicode__(self):
 243         return self.headline
 244
 245     @classmethod
 246     def _generate_cache_key(cls, key, group="node"):
 247         return super(Node, cls)._generate_cache_key(key, group)
 248
 249     @classmethod
 250     def get_type(cls):
 251         return cls.__name__.lower()
 252
 253     @property
 254     def leaf(self):
 255         leaf_cls = NodeMetaClass.types.get(self.node_type, None)
 256
 257         if leaf_cls is None:
 258             return self
 259
 260         leaf = leaf_cls()
 261         leaf.__dict__ = self.__dict__
 262         return leaf
 263
 264     @property
 265     def nstate(self):
 266         state = self.__dict__.get('_nstate', None)
 267
 268         if state is None:
 269             state = NodeStateDict(self)
 270             self._nstate = state
 271
 272         return state
 273
 274     @property
 275     def nis(self):
 276         nis = self.__dict__.get('_nis', None)
 277
 278         if nis is None:
 279             nis = NodeStateQuery(self)
 280             self._nis = nis
 281
 282         return nis
 283
 284     @property
 285     def last_activity(self):
 286         try:
 287             return self.actions.order_by('-action_date')[0].action_date
 288         except:
 289             return self.last_seen
 290
 291     @property
 292     def state_list(self):
 293         return [s.state_type for s in self.states.all()]
 294
 295     @property
 296     def deleted(self):
 297         return self.nis.deleted
 298
 299     @property
 300     def absolute_parent(self):
 301         if not self.abs_parent_id:
 302             return self
 303
 304         return self.abs_parent
 305
 306     @property
 307     def summary(self):
 308         return strip_tags(self.html)[:300]
 309
 310     @models.permalink
 311     def get_revisions_url(self):
 312         return ('revisions', (), {'id': self.id})
 313
 314     def update_last_activity(self, user, save=False, time=None):
 315         if not time:
 316             time = datetime.datetime.now()
 317
 318         self.last_activity_by = user
 319         self.last_activity_at = time
 320
 321         if self.parent:
 322             self.parent.update_last_activity(user, save=True, time=time)
 323
 324         if save:
 325             self.save()
 326
 327     def _create_revision(self, user, number, **kwargs):
 328         revision = NodeRevision(author=user, revision=number, node=self, **kwargs)
 329         revision.save()
 330         return revision
 331
 332     def create_revision(self, user, **kwargs):
 333         number = self.revisions.aggregate(last=models.Max('revision'))['last'] + 1
 334         revision = self._create_revision(user, number, **kwargs)
 335         self.activate_revision(user, revision, extensions=['urlize'])
 336         return revision
 337
 338     def activate_revision(self, user, revision, extensions=['urlize']):
 339         self.title = revision.title
 340         self.tagnames = revision.tagnames
 341         self.body = auto_user_link(self, self._as_markdown(revision.body, *extensions))
 342
 343         self.active_revision = revision
 344         self.update_last_activity(user)
 345
 346         self.save()
 347
 348     def _list_changes_in_tags(self):
 349         dirty = self.get_dirty_fields()
 350
 351         if not 'tagnames' in dirty:
 352             return None
 353         else:
 354             if self._original_state['tagnames']:
 355                 old_tags = set(name for name in self._original_state['tagnames'].split(u' '))
 356             else:
 357                 old_tags = set()
 358             new_tags = set(name for name in self.tagnames.split(u' ') if name)
 359
 360             return dict(
 361                     current=list(new_tags),
 362                     added=list(new_tags - old_tags),
 363                     removed=list(old_tags - new_tags)
 364                     )
 365
 366     def _last_active_user(self):
 367         return self.last_edited and self.last_edited.by or self.author
 368
 369     def _process_changes_in_tags(self):
 370         tag_changes = self._list_changes_in_tags()
 371
 372         if tag_changes is not None:
 373             for name in tag_changes['added']:
 374                 try:
 375                     tag = Tag.objects.get(name=name)
 376                 except:
 377                     tag = Tag.objects.create(name=name, created_by=self._last_active_user())
 378
 379                 if not self.nis.deleted:
 380                     tag.add_to_usage_count(1)
 381                     tag.save()
 382
 383             if not self.nis.deleted:
 384                 for name in tag_changes['removed']:
 385                     try:
 386                         tag = Tag.objects.get(name=name)
 387                         tag.add_to_usage_count(-1)
 388                         tag.save()
 389                     except:
 390                         pass
 391
 392             return True
 393
 394         return False
 395
 396     def mark_deleted(self, action):
 397         self.nstate.deleted = action
 398         self.save()
 399
 400         if action:
 401             for tag in self.tags.all():
 402                 tag.add_to_usage_count(-1)
 403                 tag.save()
 404         else:
 405             for tag in Tag.objects.filter(name__in=self.tagname_list()):
 406                 tag.add_to_usage_count(1)
 407                 tag.save()
 408
 409     def delete(self, *args, **kwargs):
 410         self.active_revision = None
 411         self.save()
 412
 413         for n in self.children.all():
 414             n.delete()
 415
 416         for a in self.actions.all():
 417             a.cancel()
 418
 419         super(Node, self).delete(*args, **kwargs)
 420
 421     def save(self, *args, **kwargs):
 422         tags_changed = self._process_changes_in_tags()
 423
 424         if not self.id:
 425             self.node_type = self.get_type()
 426             super(BaseModel, self).save(*args, **kwargs)
 427             self.active_revision = self._create_revision(self.author, 1, title=self.title, tagnames=self.tagnames,
 428                                                          body=self.body)
 429             self.activate_revision(self.author, self.active_revision)
 430             self.update_last_activity(self.author, time=self.added_at)
 431
 432         if self.parent_id and not self.abs_parent_id:
 433             self.abs_parent = self.parent.absolute_parent
 434
 435         super(Node, self).save(*args, **kwargs)
 436         if tags_changed: self.tags = list(Tag.objects.filter(name__in=self.tagname_list()))
 437
 438     class Meta:
 439         app_label = 'forum'
 440
 441
 442 class NodeRevision(BaseModel, NodeContent):
 443     node       = models.ForeignKey(Node, related_name='revisions')
 444     summary    = models.CharField(max_length=300)
 445     revision   = models.PositiveIntegerField()
 446     revised_at = models.DateTimeField(default=datetime.datetime.now)
 447
 448     class Meta:
 449         unique_together = ('node', 'revision')
 450         app_label = 'forum'
 451
 452
 453 class NodeState(models.Model):
 454     node       = models.ForeignKey(Node, related_name='states')
 455     state_type = models.CharField(max_length=16)
 456     action     = models.OneToOneField('Action', related_name="node_state")
 457
 458     class Meta:
 459         unique_together = ('node', 'state_type')
 460         app_label = 'forum'
 461
 462