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|
from collections import defaultdict
import datetime
import operator
import cgi
import logging
from django.utils.html import strip_tags
from django.contrib.sitemaps import ping_google
from django.utils import html
from django.conf import settings
from django.contrib.auth.models import User
from django.core import urlresolvers
from django.db import models
from django.utils import html as html_utils
from django.utils.translation import ugettext as _
from django.utils.http import urlquote as django_urlquote
from django.core import exceptions as django_exceptions
from django.core.exceptions import ValidationError
from django.contrib.contenttypes.models import ContentType
import askbot
from askbot.utils.slug import slugify
from askbot import const
from askbot.models.user import EmailFeedSetting
from askbot.models.tag import MarkedTag, tags_match_some_wildcard
from askbot.conf import settings as askbot_settings
from askbot import exceptions
from askbot.utils import markup
from askbot.utils.html import sanitize_html
from askbot.models.base import BaseQuerySetManager
#todo: maybe merge askbot.utils.markup and forum.utils.html
from askbot.utils.diff import textDiff as htmldiff
from askbot.utils import mysql
class PostQuerySet(models.query.QuerySet):
"""
Custom query set subclass for :class:`~askbot.models.Post`
"""
#todo: we may not need this query set class,
#as all methods on this class seem to want to
#belong to Thread manager or Query set.
def get_by_text_query(self, search_query):
"""returns a query set of questions,
matching the full text query
"""
return self.filter(
models.Q(thread__title__icontains = search_query)\
| models.Q(text__icontains = search_query)\
| models.Q(thread__tagnames = search_query)\
| models.Q(thread__posts__text__icontains = search_query, thread__posts__post_type='answer')
)
# #todo - goes to thread - we search whole threads
# if getattr(settings, 'USE_SPHINX_SEARCH', False):
# matching_questions = Question.sphinx_search.query(search_query)
# question_ids = [q.id for q in matching_questions]
# return Question.objects.filter(deleted = False, id__in = question_ids)
# if settings.DATABASE_ENGINE == 'mysql' and mysql.supports_full_text_search():
# return self.filter(
# models.Q(thread__title__search = search_query)\
# | models.Q(text__search = search_query)\
# | models.Q(thread__tagnames__search = search_query)\
# | models.Q(answers__text__search = search_query)
# )
# elif 'postgresql_psycopg2' in askbot.get_database_engine_name():
# rank_clause = "ts_rank(question.text_search_vector, plainto_tsquery(%s))";
# search_query = '&'.join(search_query.split())
# extra_params = (search_query,)
# extra_kwargs = {
# 'select': {'relevance': rank_clause},
# 'where': ['text_search_vector @@ plainto_tsquery(%s)'],
# 'params': extra_params,
# 'select_params': extra_params,
# }
# return self.extra(**extra_kwargs)
# else:
# #fallback to dumb title match search
# return self.filter(thread__title__icontains=search_query)
def added_between(self, start, end):
"""questions added between ``start`` and ``end`` timestamps"""
#todo: goes to thread
return self.filter(
added_at__gt = start
).exclude(
added_at__gt = end
)
def get_questions_needing_reminder(self,
user = None,
activity_type = None,
recurrence_delay = None):
"""returns list of questions that need a reminder,
corresponding the given ``activity_type``
``user`` - is the user receiving the reminder
``recurrence_delay`` - interval between sending the
reminders about the same question
"""
#todo: goes to thread
from askbot.models import Activity#avoid circular import
question_list = list()
for question in self:
try:
activity = Activity.objects.get(
user = user,
question = question,
activity_type = activity_type
)
now = datetime.datetime.now()
if now < activity.active_at + recurrence_delay:
continue
except Activity.DoesNotExist:
activity = Activity(
user = user,
question = question,
activity_type = activity_type,
content_object = question,
)
activity.active_at = datetime.datetime.now()
activity.save()
question_list.append(question)
return question_list
def get_author_list(self, **kwargs):
#todo: - this is duplication - answer manager also has this method
#will be gone when models are consolidated
#note that method get_question_and_answer_contributors is similar in function
#todo: goes to thread
authors = set()
for question in self:
authors.update(question.get_author_list(**kwargs))
return list(authors)
class PostManager(BaseQuerySetManager):
def get_query_set(self):
return PostQuerySet(self.model)
def get_questions(self):
return self.filter(post_type='question')
def get_answers(self):
return self.filter(post_type='answer')
def get_comments(self):
return self.filter(post_type='comment')
def create_new_answer(self, thread, author, added_at, text, wiki=False, email_notify=False):
# TODO: Some of this code will go to Post.objects.create_new
answer = Post(
post_type='answer',
thread=thread,
author=author,
added_at=added_at,
wiki=wiki,
text=text,
#.html field is denormalized by the save() call
)
if answer.wiki:
answer.last_edited_by = answer.author
answer.last_edited_at = added_at
answer.wikified_at = added_at
answer.parse_and_save(author=author)
answer.add_revision(
author=author,
revised_at=added_at,
text=text,
comment = const.POST_STATUS['default_version'],
)
#update thread data
thread.answer_count +=1
thread.save()
thread.set_last_activity(last_activity_at=added_at, last_activity_by=author) # this should be here because it regenerates cached thread summary html
#set notification/delete
if email_notify:
thread.followed_by.add(author)
else:
thread.followed_by.remove(author)
return answer
def precache_comments(self, for_posts, visitor):
"""
Fetches comments for given posts, and stores them in post._cached_comments
Additionally, annotates posts with ``upvoted_by_user`` parameter, if visitor is logged in
"""
qs = Post.objects.get_comments().filter(parent__in=for_posts).select_related('author')
if visitor.is_anonymous():
comments = list(qs.order_by('added_at'))
else:
upvoted_by_user = list(qs.filter(votes__user=visitor).distinct())
not_upvoted_by_user = list(qs.exclude(votes__user=visitor).distinct())
for c in upvoted_by_user:
c.upvoted_by_user = 1 # numeric value to maintain compatibility with previous version of this code
comments = upvoted_by_user + not_upvoted_by_user
comments.sort(key=operator.attrgetter('added_at'))
post_map = defaultdict(list)
for cm in comments:
post_map[cm.parent_id].append(cm)
for post in for_posts:
post._cached_comments = post_map[post.id]
# Old Post.get_comment(self, visitor=None) method:
# if visitor.is_anonymous():
# return self.comments.order_by('added_at')
# else:
# upvoted_by_user = list(self.comments.filter(votes__user=visitor).distinct())
# not_upvoted_by_user = list(self.comments.exclude(votes__user=visitor).distinct())
#
# for c in upvoted_by_user:
# c.upvoted_by_user = 1 # numeric value to maintain compatibility with previous version of this code
#
# comments = upvoted_by_user + not_upvoted_by_user
# comments.sort(key=operator.attrgetter('added_at'))
#
# return comments
class Post(models.Model):
post_type = models.CharField(max_length=255, db_index=True)
old_question_id = models.PositiveIntegerField(null=True, blank=True, default=None, unique=True)
old_answer_id = models.PositiveIntegerField(null=True, blank=True, default=None, unique=True)
old_comment_id = models.PositiveIntegerField(null=True, blank=True, default=None, unique=True)
parent = models.ForeignKey('Post', blank=True, null=True, related_name='comments') # Answer or Question for Comment
thread = models.ForeignKey('Thread', related_name='posts')
author = models.ForeignKey(User, related_name='posts')
added_at = models.DateTimeField(default=datetime.datetime.now)
deleted = models.BooleanField(default=False, db_index=True)
deleted_at = models.DateTimeField(null=True, blank=True)
deleted_by = models.ForeignKey(User, null=True, blank=True, related_name='deleted_posts')
wiki = models.BooleanField(default=False)
wikified_at = models.DateTimeField(null=True, blank=True)
locked = models.BooleanField(default=False)
locked_by = models.ForeignKey(User, null=True, blank=True, related_name='locked_posts')
locked_at = models.DateTimeField(null=True, blank=True)
score = models.IntegerField(default=0)
vote_up_count = models.IntegerField(default=0)
vote_down_count = models.IntegerField(default=0)
comment_count = models.PositiveIntegerField(default=0)
offensive_flag_count = models.SmallIntegerField(default=0)
last_edited_at = models.DateTimeField(null=True, blank=True)
last_edited_by = models.ForeignKey(User, null=True, blank=True, related_name='last_edited_posts')
html = models.TextField(null=True)#html rendition of the latest revision
text = models.TextField(null=True)#denormalized copy of latest revision
# Denormalised data
summary = models.CharField(max_length=180)
#note: anonymity here applies to question only, but
#the field will still go to thread
#maybe we should rename it to is_question_anonymous
#we might have to duplicate the is_anonymous on the Post,
#if we are to allow anonymous answers
#the reason is that the title and tags belong to thread,
#but the question body to Post
is_anonymous = models.BooleanField(default=False)
objects = PostManager()
class Meta:
app_label = 'askbot'
db_table = 'askbot_post'
def parse_post_text(post):
"""typically post has a field to store raw source text
in comment it is called .comment, in Question and Answer it is
called .text
also there is another field called .html (consistent across models)
so the goal of this function is to render raw text into .html
and extract any metadata given stored in source (currently
this metadata is limited by twitter style @mentions
but there may be more in the future
function returns a dictionary with the following keys
html
newly_mentioned_users - list of <User> objects
removed_mentions - list of mention <Activity> objects - for removed ones
"""
if post.is_answer() or post.is_question():
_urlize = False
_use_markdown = True
_escape_html = False #markdow does the escaping
elif post.is_comment():
_urlize = True
_use_markdown = True
_escape_html = True
else:
raise NotImplementedError
text = post.text
if _escape_html:
text = cgi.escape(text)
if _urlize:
text = html.urlize(text)
if _use_markdown:
text = sanitize_html(markup.get_parser().convert(text))
#todo, add markdown parser call conditional on
#post.use_markdown flag
post_html = text
mentioned_authors = list()
removed_mentions = list()
if '@' in text:
op = post.get_origin_post()
anticipated_authors = op.get_author_list(
include_comments = True,
recursive = True
)
extra_name_seeds = markup.extract_mentioned_name_seeds(text)
extra_authors = set()
for name_seed in extra_name_seeds:
extra_authors.update(User.objects.filter(
username__istartswith = name_seed
)
)
#it is important to preserve order here so that authors of post
#get mentioned first
anticipated_authors += list(extra_authors)
mentioned_authors, post_html = markup.mentionize_text(
text,
anticipated_authors
)
#find mentions that were removed and identify any previously
#entered mentions so that we can send alerts on only new ones
from askbot.models.user import Activity
if post.pk is not None:
#only look for previous mentions if post was already saved before
prev_mention_qs = Activity.objects.get_mentions(
mentioned_in = post
)
new_set = set(mentioned_authors)
for prev_mention in prev_mention_qs:
user = prev_mention.get_mentioned_user()
if user is None:
continue
if user in new_set:
#don't report mention twice
new_set.remove(user)
else:
removed_mentions.append(prev_mention)
mentioned_authors = list(new_set)
data = {
'html': post_html,
'newly_mentioned_users': mentioned_authors,
'removed_mentions': removed_mentions,
}
return data
#todo: when models are merged, it would be great to remove author parameter
def parse_and_save_post(post, author = None, **kwargs):
"""generic method to use with posts to be used prior to saving
post edit or addition
"""
assert(author is not None)
last_revision = post.html
data = post.parse()
post.html = data['html']
newly_mentioned_users = set(data['newly_mentioned_users']) - set([author])
removed_mentions = data['removed_mentions']
#a hack allowing to save denormalized .summary field for questions
if hasattr(post, 'summary'):
post.summary = strip_tags(post.html)[:120]
#delete removed mentions
for rm in removed_mentions:
rm.delete()
created = post.pk is None
#this save must precede saving the mention activity
#because generic relation needs primary key of the related object
super(post.__class__, post).save(**kwargs)
if last_revision:
diff = htmldiff(last_revision, post.html)
else:
diff = post.get_snippet()
timestamp = post.get_time_of_last_edit()
#todo: this is handled in signal because models for posts
#are too spread out
from askbot.models import signals
signals.post_updated.send(
post = post,
updated_by = author,
newly_mentioned_users = newly_mentioned_users,
timestamp = timestamp,
created = created,
diff = diff,
sender = post.__class__
)
try:
from askbot.conf import settings as askbot_settings
if askbot_settings.GOOGLE_SITEMAP_CODE != '':
ping_google()
except Exception:
logging.debug('cannot ping google - did you register with them?')
######################################
# TODO: Rename the methods above instead of doing this assignment
parse = parse_post_text
parse_and_save = parse_and_save_post
######################################
def is_question(self):
return self.post_type == 'question'
def is_answer(self):
return self.post_type == 'answer'
def is_comment(self):
return self.post_type == 'comment'
def get_absolute_url(self, no_slug = False, question_post=None, thread=None):
from askbot.utils.slug import slugify
if not hasattr(self, '_thread_cache') and thread:
self._thread_cache = thread
if self.is_answer():
if not question_post:
question_post = self.thread._question_post()
return u'%(base)s%(slug)s?answer=%(id)d#answer-container-%(id)d' % {
'base': urlresolvers.reverse('question', args=[question_post.id]),
'slug': django_urlquote(slugify(self.thread.title)),
'id': self.id
}
elif self.is_question():
url = urlresolvers.reverse('question', args=[self.id])
if no_slug is False:
url += django_urlquote(self.slug)
return url
elif self.is_comment():
origin_post = self.get_origin_post()
return '%(url)s?comment=%(id)d#comment-%(id)d' % \
{'url': origin_post.get_absolute_url(), 'id':self.id}
raise NotImplementedError
def delete(self, **kwargs):
"""deletes comment and concomitant response activity
records, as well as mention records, while preserving
integrity or response counts for the users
"""
if self.is_comment():
#todo: implement a custom delete method on these
#all this should pack into Activity.responses.filter( somehow ).delete()
activity_types = const.RESPONSE_ACTIVITY_TYPES_FOR_DISPLAY
activity_types += (const.TYPE_ACTIVITY_MENTION,)
#todo: not very good import in models of other models
#todo: potentially a circular import
from askbot.models.user import Activity
comment_content_type = ContentType.objects.get_for_model(self)
activities = Activity.objects.filter(
content_type = comment_content_type,
object_id = self.id,
activity_type__in = activity_types
)
recipients = set()
for activity in activities:
for user in activity.recipients.all():
recipients.add(user)
#activities need to be deleted before the response
#counts are updated
activities.delete()
for user in recipients:
user.update_response_counts()
super(Post, self).delete(**kwargs)
def __unicode__(self):
if self.is_question():
return self.thread.title
elif self.is_answer():
return self.html
elif self.is_comment():
return self.text
raise NotImplementedError
def save(self, *args, **kwargs):
if self.is_answer() and self.is_anonymous:
raise ValueError('Answer cannot be anonymous!')
super(Post, self).save(*args, **kwargs)
if self.is_answer() and 'postgres' in askbot.get_database_engine_name():
#hit the database to trigger update of full text search vector
self.thread._question_post().save()
def _get_slug(self):
if not self.is_question():
raise NotImplementedError
return slugify(self.thread.title)
slug = property(_get_slug)
def get_snippet(self):
"""returns an abbreviated snippet of the content
"""
return html_utils.strip_tags(self.html)[:120] + ' ...'
def add_comment(self, comment=None, user=None, added_at=None):
if added_at is None:
added_at = datetime.datetime.now()
if None in (comment ,user):
raise Exception('arguments comment and user are required')
from askbot.models import Post
comment = Post(
post_type='comment',
thread=self.thread,
parent=self,
text=comment,
author=user,
added_at=added_at
)
comment.parse_and_save(author = user)
self.comment_count = self.comment_count + 1
self.save()
#tried to add this to bump updated question
#in most active list, but it did not work
#becase delayed email updates would be triggered
#for cases where user did not subscribe for them
#
#need to redo the delayed alert sender
#
#origin_post = self.get_origin_post()
#if origin_post == self:
# self.last_activity_at = added_at # WARNING: last_activity_* are now in Thread
# self.last_activity_by = user
#else:
# origin_post.last_activity_at = added_at
# origin_post.last_activity_by = user
# origin_post.save()
return comment
def get_global_tag_based_subscribers(
self,
tag_mark_reason = None,
subscription_records = None
):
"""returns a list of users who either follow or "do not ignore"
the given set of tags, depending on the tag_mark_reason
``subscription_records`` - query set of ``~askbot.models.EmailFeedSetting``
this argument is used to reduce number of database queries
"""
if tag_mark_reason == 'good':
email_tag_filter_strategy = const.INCLUDE_INTERESTING
user_set_getter = User.objects.filter
elif tag_mark_reason == 'bad':
email_tag_filter_strategy = const.EXCLUDE_IGNORED
user_set_getter = User.objects.exclude
else:
raise ValueError('Uknown value of tag mark reason %s' % tag_mark_reason)
#part 1 - find users who follow or not ignore the set of tags
tag_names = self.get_tag_names()
tag_selections = MarkedTag.objects.filter(
tag__name__in = tag_names,
reason = tag_mark_reason
)
subscribers = set(
user_set_getter(
tag_selections__in = tag_selections
).filter(
notification_subscriptions__in = subscription_records
).filter(
email_tag_filter_strategy = email_tag_filter_strategy
)
)
#part 2 - find users who follow or not ignore tags via wildcard selections
#inside there is a potentially time consuming loop
if askbot_settings.USE_WILDCARD_TAGS:
#todo: fix this
#this branch will not scale well
#because we have to loop through the list of users
#in python
if tag_mark_reason == 'good':
empty_wildcard_filter = {'interesting_tags__exact': ''}
wildcard_tags_attribute = 'interesting_tags'
update_subscribers = lambda the_set, item: the_set.add(item)
elif tag_mark_reason == 'bad':
empty_wildcard_filter = {'ignored_tags__exact': ''}
wildcard_tags_attribute = 'ignored_tags'
update_subscribers = lambda the_set, item: the_set.discard(item)
potential_wildcard_subscribers = User.objects.filter(
notification_subscriptions__in = subscription_records
).filter(
email_tag_filter_strategy = email_tag_filter_strategy
).exclude(
**empty_wildcard_filter #need this to limit size of the loop
)
for potential_subscriber in potential_wildcard_subscribers:
wildcard_tags = getattr(
potential_subscriber,
wildcard_tags_attribute
).split(' ')
if tags_match_some_wildcard(tag_names, wildcard_tags):
update_subscribers(subscribers, potential_subscriber)
return subscribers
def get_global_instant_notification_subscribers(self):
"""returns a set of subscribers to post according to tag filters
both - subscribers who ignore tags or who follow only
specific tags
this method in turn calls several more specialized
subscriber retrieval functions
todo: retrieval of wildcard tag followers ignorers
won't scale at all
"""
subscriber_set = set()
global_subscriptions = EmailFeedSetting.objects.filter(
feed_type = 'q_all',
frequency = 'i'
)
#segment of users who have tag filter turned off
global_subscribers = User.objects.filter(
email_tag_filter_strategy = const.INCLUDE_ALL
)
subscriber_set.update(global_subscribers)
#segment of users who want emails on selected questions only
subscriber_set.update(
self.get_global_tag_based_subscribers(
subscription_records = global_subscriptions,
tag_mark_reason = 'good'
)
)
#segment of users who want to exclude ignored tags
subscriber_set.update(
self.get_global_tag_based_subscribers(
subscription_records = global_subscriptions,
tag_mark_reason = 'bad'
)
)
return subscriber_set
def _qa__get_instant_notification_subscribers(
self,
potential_subscribers = None,
mentioned_users = None,
exclude_list = None,
):
"""get list of users who have subscribed to
receive instant notifications for a given post
this method works for questions and answers
Arguments:
* ``potential_subscribers`` is not used here! todo: why? - clean this out
parameter is left for the uniformity of the interface
(Comment method does use it)
normally these methods would determine the list
:meth:`~askbot.models.question.Question.get_response_recipients`
:meth:`~askbot.models.question.Answer.get_response_recipients`
- depending on the type of the post
* ``mentioned_users`` - users, mentioned in the post for the first time
* ``exclude_list`` - users who must be excluded from the subscription
Users who receive notifications are:
* of ``mentioned_users`` - those who subscribe for the instant
updates on the @name mentions
* those who follow the parent question
* global subscribers (any personalized tag filters are applied)
* author of the question who subscribe to instant updates
on questions that they asked
* authors or any answers who subsribe to instant updates
on the questions which they answered
"""
#print '------------------'
#print 'in content function'
subscriber_set = set()
#print 'potential subscribers: ', potential_subscribers
#1) mention subscribers - common to questions and answers
if mentioned_users:
mention_subscribers = EmailFeedSetting.objects.filter_subscribers(
potential_subscribers = mentioned_users,
feed_type = 'm_and_c',
frequency = 'i'
)
subscriber_set.update(mention_subscribers)
origin_post = self.get_origin_post()
#print origin_post
#2) individually selected - make sure that users
#are individual subscribers to this question
# TODO: The line below works only if origin_post is Question !
selective_subscribers = origin_post.thread.followed_by.all()
#print 'question followers are ', [s for s in selective_subscribers]
if selective_subscribers:
selective_subscribers = EmailFeedSetting.objects.filter_subscribers(
potential_subscribers = selective_subscribers,
feed_type = 'q_sel',
frequency = 'i'
)
subscriber_set.update(selective_subscribers)
#print 'selective subscribers: ', selective_subscribers
#3) whole forum subscribers
global_subscribers = origin_post.get_global_instant_notification_subscribers()
subscriber_set.update(global_subscribers)
#4) question asked by me (todo: not "edited_by_me" ???)
question_author = origin_post.author
if EmailFeedSetting.objects.filter(subscriber = question_author, frequency = 'i', feed_type = 'q_ask').exists():
subscriber_set.add(question_author)
#4) questions answered by me -make sure is that people
#are authors of the answers to this question
#todo: replace this with a query set method
answer_authors = set()
for answer in origin_post.thread.posts.get_answers().all():
authors = answer.get_author_list()
answer_authors.update(authors)
if answer_authors:
answer_subscribers = EmailFeedSetting.objects.filter_subscribers(
potential_subscribers = answer_authors,
frequency = 'i',
feed_type = 'q_ans',
)
subscriber_set.update(answer_subscribers)
#print 'answer subscribers: ', answer_subscribers
#print 'exclude_list is ', exclude_list
subscriber_set -= set(exclude_list)
#print 'final subscriber set is ', subscriber_set
return list(subscriber_set)
def _comment__get_instant_notification_subscribers(
self,
potential_subscribers = None,
mentioned_users = None,
exclude_list = None
):
"""get list of users who want instant notifications about comments
argument potential_subscribers is required as it saves on db hits
Here is the list of people who will receive the notifications:
* mentioned users
* of response receivers
(see :meth:`~askbot.models.meta.Comment.get_response_receivers`) -
those who subscribe for the instant
updates on comments and @mentions
* all who follow the question explicitly
* all global subscribers
(tag filtered, and subject to personalized settings)
"""
#print 'in meta function'
#print 'potential subscribers: ', potential_subscribers
subscriber_set = set()
if potential_subscribers:
potential_subscribers = set(potential_subscribers)
else:
potential_subscribers = set()
if mentioned_users:
potential_subscribers.update(mentioned_users)
if potential_subscribers:
comment_subscribers = EmailFeedSetting.objects.filter_subscribers(
potential_subscribers = potential_subscribers,
feed_type = 'm_and_c',
frequency = 'i'
)
subscriber_set.update(comment_subscribers)
#print 'comment subscribers: ', comment_subscribers
origin_post = self.get_origin_post()
# TODO: The line below works only if origin_post is Question !
selective_subscribers = origin_post.thread.followed_by.all()
if selective_subscribers:
selective_subscribers = EmailFeedSetting.objects.filter_subscribers(
potential_subscribers = selective_subscribers,
feed_type = 'q_sel',
frequency = 'i'
)
for subscriber in selective_subscribers:
if origin_post.passes_tag_filter_for_user(subscriber):
subscriber_set.add(subscriber)
subscriber_set.update(selective_subscribers)
#print 'selective subscribers: ', selective_subscribers
global_subscribers = origin_post.get_global_instant_notification_subscribers()
#print 'global subscribers: ', global_subscribers
subscriber_set.update(global_subscribers)
#print 'exclude list is: ', exclude_list
if exclude_list:
subscriber_set -= set(exclude_list)
#print 'final list of subscribers:', subscriber_set
return list(subscriber_set)
def get_instant_notification_subscribers(self, potential_subscribers = None, mentioned_users = None, exclude_list = None):
if self.is_question() or self.is_answer():
return self._qa__get_instant_notification_subscribers(
potential_subscribers=potential_subscribers,
mentioned_users=mentioned_users,
exclude_list=exclude_list
)
elif self.is_comment():
return self._comment__get_instant_notification_subscribers(
potential_subscribers=potential_subscribers,
mentioned_users=mentioned_users,
exclude_list=exclude_list
)
raise NotImplementedError
def get_latest_revision(self):
return self.revisions.order_by('-revised_at')[0]
def get_latest_revision_number(self):
if self.is_comment():
return 1
else:
return self.get_latest_revision().revision
def get_time_of_last_edit(self):
if self.is_comment():
return self.added_at
if self.last_edited_at:
return self.last_edited_at
else:
return self.added_at
def get_owner(self): # TODO: remove me
return self.author
def get_author_list(
self,
include_comments = False,
recursive = False,
exclude_list = None):
#todo: there may be a better way to do these queries
authors = set()
authors.update([r.author for r in self.revisions.all()])
if include_comments:
authors.update([c.author for c in self.comments.all()])
if recursive:
if self.is_question(): #hasattr(self, 'answers'):
#for a in self.answers.exclude(deleted = True):
for a in self.thread.posts.get_answers().exclude(deleted = True):
authors.update(a.get_author_list( include_comments = include_comments ) )
if exclude_list:
authors -= set(exclude_list)
return list(authors)
def passes_tag_filter_for_user(self, user):
question = self.get_origin_post()
if user.email_tag_filter_strategy == const.INCLUDE_INTERESTING:
#at least some of the tags must be marked interesting
return user.has_affinity_to_question(
question,
affinity_type = 'like'
)
elif user.email_tag_filter_strategy == const.EXCLUDE_IGNORED:
return not user.has_affinity_to_question(
question,
affinity_type = 'dislike'
)
elif user.email_tag_filter_strategy == const.INCLUDE_ALL:
return True
else:
raise ValueError(
'unexpected User.email_tag_filter_strategy %s'\
% user.email_tag_filter_strategy
)
def post_get_last_update_info(self):#todo: rename this subroutine
when = self.added_at
who = self.author
if self.last_edited_at and self.last_edited_at > when:
when = self.last_edited_at
who = self.last_edited_by
comments = self.comments.all()
if len(comments) > 0:
for c in comments:
if c.added_at > when:
when = c.added_at
who = c.user
return when, who
def tagname_meta_generator(self):
return u','.join([unicode(tag) for tag in self.get_tag_names()])
def get_origin_post(self):
if self.post_type == 'question':
return self
else:
return self.thread._question_post()
def _repost_as_question(self, new_title = None):
"""posts answer as question, together with all the comments
while preserving time stamps and authors
does not delete the answer itself though
"""
if not self.is_answer():
raise NotImplementedError
revisions = self.revisions.all().order_by('revised_at')
rev0 = revisions[0]
new_question = rev0.author.post_question(
title = new_title,
body_text = rev0.text,
tags = self.question.thread.tagnames,
wiki = self.question.wiki,
is_anonymous = self.question.is_anonymous,
timestamp = rev0.revised_at
)
if len(revisions) > 1:
for rev in revisions[1:]:
rev.author.edit_question(
question = new_question,
body_text = rev.text,
revision_comment = rev.summary,
timestamp = rev.revised_at
)
for comment in self.comments.all():
comment.content_object = new_question
comment.save()
return new_question
def _repost_as_answer(self, question = None):
"""posts question as answer to another question,
but does not delete the question,
but moves all the comments to the new answer"""
if not self.is_question():
raise NotImplementedError
revisions = self.revisions.all().order_by('revised_at')
rev0 = revisions[0]
new_answer = rev0.author.post_answer(
question = question,
body_text = rev0.text,
wiki = self.wiki,
timestamp = rev0.revised_at
)
if len(revisions) > 1:
for rev in revisions:
rev.author.edit_answer(
answer = new_answer,
body_text = rev.text,
revision_comment = rev.summary,
timestamp = rev.revised_at
)
for comment in self.comments.all():
comment.content_object = new_answer
comment.save()
return new_answer
def swap_with_question(self, new_title = None):
"""swaps answer with the question it belongs to and
sets the title of question to ``new_title``
"""
if not self.is_answer():
raise NotImplementedError
#1) make new question by using new title, tags of old question
# and the answer body, as well as the authors of all revisions
# and repost all the comments
new_question = self._repost_as_question(new_title = new_title)
#2) post question (all revisions and comments) as answer
new_answer = self.question._repost_as_answer(question = new_question)
#3) assign all remaining answers to the new question
self.question.answers.update(question = new_question)
self.question.delete()
self.delete()
return new_question
def get_user_vote(self, user):
if not self.is_answer():
raise NotImplementedError
if user.is_anonymous():
return None
votes = self.votes.filter(user=user)
if votes and votes.count() > 0:
return votes[0]
else:
return None
def _question__assert_is_visible_to(self, user):
"""raises QuestionHidden"""
if self.deleted:
message = _(
'Sorry, this question has been '
'deleted and is no longer accessible'
)
if user.is_anonymous():
raise exceptions.QuestionHidden(message)
try:
user.assert_can_see_deleted_post(self)
except django_exceptions.PermissionDenied:
raise exceptions.QuestionHidden(message)
def _answer__assert_is_visible_to(self, user):
"""raises QuestionHidden or AnswerHidden"""
try:
self.thread._question_post().assert_is_visible_to(user)
except exceptions.QuestionHidden:
message = _(
'Sorry, the answer you are looking for is '
'no longer available, because the parent '
'question has been removed'
)
raise exceptions.QuestionHidden(message)
if self.deleted:
message = _(
'Sorry, this answer has been '
'removed and is no longer accessible'
)
if user.is_anonymous():
raise exceptions.AnswerHidden(message)
try:
user.assert_can_see_deleted_post(self)
except django_exceptions.PermissionDenied:
raise exceptions.AnswerHidden(message)
def _comment__assert_is_visible_to(self, user):
"""raises QuestionHidden or AnswerHidden"""
try:
self.parent.assert_is_visible_to(user)
except exceptions.QuestionHidden:
message = _(
'Sorry, the comment you are looking for is no '
'longer accessible, because the parent question '
'has been removed'
)
raise exceptions.QuestionHidden(message)
except exceptions.AnswerHidden:
message = _(
'Sorry, the comment you are looking for is no '
'longer accessible, because the parent answer '
'has been removed'
)
raise exceptions.AnswerHidden(message)
def assert_is_visible_to(self, user):
if self.is_question():
return self._question__assert_is_visible_to(user)
elif self.is_answer():
return self._answer__assert_is_visible_to(user)
elif self.is_comment():
return self._comment__assert_is_visible_to(user)
raise NotImplementedError
def get_updated_activity_data(self, created = False):
if self.is_answer():
#todo: simplify this to always return latest revision for the second
#part
if created:
return const.TYPE_ACTIVITY_ANSWER, self
else:
latest_revision = self.get_latest_revision()
return const.TYPE_ACTIVITY_UPDATE_ANSWER, latest_revision
elif self.is_question():
if created:
return const.TYPE_ACTIVITY_ASK_QUESTION, self
else:
latest_revision = self.get_latest_revision()
return const.TYPE_ACTIVITY_UPDATE_QUESTION, latest_revision
elif self.is_comment():
if self.parent.post_type == 'question':
return const.TYPE_ACTIVITY_COMMENT_QUESTION, self
elif self.parent.post_type == 'answer':
return const.TYPE_ACTIVITY_COMMENT_ANSWER, self
raise NotImplementedError
def get_tag_names(self):
return self.thread.get_tag_names()
def _answer__apply_edit(self, edited_at=None, edited_by=None, text=None, comment=None, wiki=False):
if text is None:
text = self.get_latest_revision().text
if edited_at is None:
edited_at = datetime.datetime.now()
if edited_by is None:
raise Exception('edited_by is required')
self.last_edited_at = edited_at
self.last_edited_by = edited_by
#self.html is denormalized in save()
self.text = text
#todo: bug wiki has no effect here
#must add revision before saving the answer
self.add_revision(
author = edited_by,
revised_at = edited_at,
text = text,
comment = comment
)
self.parse_and_save(author = edited_by)
self.thread.set_last_activity(last_activity_at=edited_at, last_activity_by=edited_by)
def _question__apply_edit(self, edited_at=None, edited_by=None, title=None,\
text=None, comment=None, tags=None, wiki=False,\
edit_anonymously = False):
latest_revision = self.get_latest_revision()
#a hack to allow partial edits - important for SE loader
if title is None:
title = self.thread.title
if text is None:
text = latest_revision.text
if tags is None:
tags = latest_revision.tagnames
if edited_by is None:
raise Exception('parameter edited_by is required')
if edited_at is None:
edited_at = datetime.datetime.now()
# Update the Question itself
self.last_edited_at = edited_at
self.last_edited_by = edited_by
self.text = text
self.is_anonymous = edit_anonymously
#wiki is an eternal trap whence there is no exit
if self.wiki == False and wiki == True:
self.wiki = True
# Update the Question tag associations
if latest_revision.tagnames != tags:
self.thread.update_tags(tagnames = tags, user = edited_by, timestamp = edited_at)
self.thread.title = title
self.thread.tagnames = tags
self.thread.save()
# Create a new revision
self.add_revision( # has to be called AFTER updating the thread, otherwise it doesn't see new tags and the new title
author = edited_by,
text = text,
revised_at = edited_at,
is_anonymous = edit_anonymously,
comment = comment,
)
self.parse_and_save(author = edited_by)
self.thread.set_last_activity(last_activity_at=edited_at, last_activity_by=edited_by)
def apply_edit(self, *kargs, **kwargs):
if self.is_answer():
return self._answer__apply_edit(*kargs, **kwargs)
elif self.is_question():
return self._question__apply_edit(*kargs, **kwargs)
raise NotImplementedError
def _answer__add_revision(self, author=None, revised_at=None, text=None, comment=None):
#todo: this may be identical to Question.add_revision
if None in (author, revised_at, text):
raise Exception('arguments author, revised_at and text are required')
rev_no = self.revisions.all().count() + 1
if comment in (None, ''):
if rev_no == 1:
comment = const.POST_STATUS['default_version']
else:
comment = 'No.%s Revision' % rev_no
from askbot.models.post import PostRevision
return PostRevision.objects.create_answer_revision(
post=self,
author=author,
revised_at=revised_at,
text=text,
summary=comment,
revision=rev_no
)
def _question__add_revision(
self,
author = None,
is_anonymous = False,
text = None,
comment = None,
revised_at = None
):
if None in (author, text, comment):
raise Exception('author, text and comment are required arguments')
rev_no = self.revisions.all().count() + 1
if comment in (None, ''):
if rev_no == 1:
comment = const.POST_STATUS['default_version']
else:
comment = 'No.%s Revision' % rev_no
from askbot.models.post import PostRevision
return PostRevision.objects.create_question_revision(
post = self,
revision = rev_no,
title = self.thread.title,
author = author,
is_anonymous = is_anonymous,
revised_at = revised_at,
tagnames = self.thread.tagnames,
summary = comment,
text = text
)
def add_revision(self, *kargs, **kwargs):
if self.is_answer():
return self._answer__add_revision(*kargs, **kwargs)
elif self.is_question():
return self._question__add_revision(*kargs, **kwargs)
raise NotImplementedError
def _answer__get_response_receivers(self, exclude_list = None):
"""get list of users interested in this response
update based on their participation in the question
activity
exclude_list is required and normally should contain
author of the updated so that he/she is not notified of
the response
"""
assert(exclude_list is not None)
recipients = set()
recipients.update(
self.get_author_list(
include_comments = True
)
)
question = self.thread._question_post()
recipients.update(
question.get_author_list(
include_comments = True
)
)
for answer in question.thread.posts.get_answers().all():
recipients.update(answer.get_author_list())
recipients -= set(exclude_list)
return list(recipients)
def _question__get_response_receivers(self, exclude_list = None):
"""returns list of users who might be interested
in the question update based on their participation
in the question activity
exclude_list is mandatory - it normally should have the
author of the update so the he/she is not notified about the update
"""
assert(exclude_list != None)
recipients = set()
recipients.update(
self.get_author_list(
include_comments = True
)
)
#do not include answer commenters here
for a in self.thread.posts.get_answers().all():
recipients.update(a.get_author_list())
recipients -= set(exclude_list)
return recipients
def _comment__get_response_receivers(self, exclude_list = None):
"""Response receivers are commenters of the
same post and the authors of the post itself.
"""
assert(exclude_list is not None)
users = set()
#get authors of parent object and all associated comments
users.update(
self.parent.get_author_list(
include_comments = True,
)
)
users -= set(exclude_list)
return list(users)
def get_response_receivers(self, exclude_list = None):
if self.is_answer():
return self._answer__get_response_receivers(exclude_list)
elif self.is_question():
return self._question__get_response_receivers(exclude_list)
elif self.is_comment():
return self._comment__get_response_receivers(exclude_list)
raise NotImplementedError
def get_question_title(self):
if self.is_question():
if self.thread.closed:
attr = const.POST_STATUS['closed']
elif self.deleted:
attr = const.POST_STATUS['deleted']
else:
attr = None
if attr is not None:
return u'%s %s' % (self.thread.title, attr)
else:
return self.thread.title
raise NotImplementedError
def accepted(self):
if self.is_answer():
return self.thread.accepted_answer_id == self.id
raise NotImplementedError
def get_page_number(self, answer_posts):
"""When question has many answers, answers are
paginated. This function returns number of the page
on which the answer will be shown, using the default
sort order. The result may depend on the visitor."""
if not self.is_answer() and not self.is_comment():
raise NotImplementedError
if self.is_comment():
post = self.parent
else:
post = self
order_number = 0
for answer_post in answer_posts:
if post == answer_post:
break
order_number += 1
return int(order_number/const.ANSWERS_PAGE_SIZE) + 1
def get_order_number(self):
if not self.is_comment():
raise NotImplementedError
return self.parent.comments.filter(added_at__lt = self.added_at).count() + 1
def is_upvoted_by(self, user):
from askbot.models.meta import Vote
return Vote.objects.filter(user=user, voted_post=self, vote=Vote.VOTE_UP).exists()
def is_last(self):
"""True if there are no newer comments on
the related parent object
"""
if not self.is_comment():
raise NotImplementedError
return Post.objects.get_comments().filter(
added_at__gt=self.added_at,
parent=self.parent
).exists() is False
def hack_template_marker(self, name):
list(Post.objects.filter(text=name))
class PostRevisionManager(models.Manager):
def create(self, *kargs, **kwargs):
raise NotImplementedError # Prevent accidental creation of PostRevision instance without `revision_type` set
def create_question_revision(self, *kargs, **kwargs):
kwargs['revision_type'] = self.model.QUESTION_REVISION
return super(PostRevisionManager, self).create(*kargs, **kwargs)
def create_answer_revision(self, *kargs, **kwargs):
kwargs['revision_type'] = self.model.ANSWER_REVISION
return super(PostRevisionManager, self).create(*kargs, **kwargs)
def question_revisions(self):
return self.filter(revision_type=self.model.QUESTION_REVISION)
def answer_revisions(self):
return self.filter(revision_type=self.model.ANSWER_REVISION)
class PostRevision(models.Model):
QUESTION_REVISION_TEMPLATE_NO_TAGS = (
'<h3>%(title)s</h3>\n'
'<div class="text">%(html)s</div>\n'
)
QUESTION_REVISION = 1
ANSWER_REVISION = 2
REVISION_TYPE_CHOICES = (
(QUESTION_REVISION, 'question'),
(ANSWER_REVISION, 'answer'),
)
REVISION_TYPE_CHOICES_DICT = dict(REVISION_TYPE_CHOICES)
post = models.ForeignKey('askbot.Post', related_name='revisions', null=True, blank=True)
revision_type = models.SmallIntegerField(choices=REVISION_TYPE_CHOICES) # TODO: remove as we have Post now
revision = models.PositiveIntegerField()
author = models.ForeignKey('auth.User', related_name='%(class)ss')
revised_at = models.DateTimeField()
summary = models.CharField(max_length=300, blank=True)
text = models.TextField()
# Question-specific fields
title = models.CharField(max_length=300, blank=True, default='')
tagnames = models.CharField(max_length=125, blank=True, default='')
is_anonymous = models.BooleanField(default=False)
objects = PostRevisionManager()
class Meta:
# INFO: This `unique_together` constraint might be problematic for databases in which
# 2+ NULLs cannot be stored in an UNIQUE column.
# As far as I know MySQL, PostgreSQL and SQLite allow that so we're on the safe side.
unique_together = ('post', 'revision')
ordering = ('-revision',)
app_label = 'askbot'
def revision_type_str(self):
return self.REVISION_TYPE_CHOICES_DICT[self.revision_type]
def __unicode__(self):
return u'%s - revision %s of %s' % (self.revision_type_str(), self.revision, self.title)
def parent(self):
return self.post
def clean(self):
"Internal cleaning method, called from self.save() by self.full_clean()"
# TODO: Remove this when we remove `revision_type`
if not self.post:
raise ValidationError('Post field has to be set.')
if (self.post.post_type == 'question' and not self.is_question_revision()) or \
(self.post.post_type == 'answer' and not self.is_answer_revision()):
raise ValidationError('Revision_type doesn`t match values in question/answer fields.')
def save(self, **kwargs):
# Determine the revision number, if not set
if not self.revision:
# TODO: Maybe use Max() aggregation? Or `revisions.count() + 1`
self.revision = self.parent().revisions.values_list('revision', flat=True)[0] + 1
# Make sure that everything is ok, in particular that `revision_type` and `revision` are set to valid values
self.full_clean()
super(PostRevision, self).save(**kwargs)
def is_question_revision(self):
return self.revision_type == self.QUESTION_REVISION
def is_answer_revision(self):
return self.revision_type == self.ANSWER_REVISION
@models.permalink
def get_absolute_url(self):
if self.is_question_revision():
return 'question_revisions', (self.question.id,), {}
elif self.is_answer_revision():
return 'answer_revisions', (), {'id':self.answer.id}
def get_question_title(self):
#INFO: ack-grepping shows that it's only used for Questions, so there's no code for Answers
return self.question.thread.title
def as_html(self, **kwargs):
markdowner = markup.get_parser()
sanitized_html = sanitize_html(markdowner.convert(self.text))
if self.is_question_revision():
return self.QUESTION_REVISION_TEMPLATE_NO_TAGS % {
'title': self.title,
'html': sanitized_html
}
elif self.is_answer_revision():
return sanitized_html
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