splinext/forum/model/__init__.py

   1 from datetime import datetime
   2
   3 from sqlalchemy import and_, Column, ForeignKey, Index
   4 from sqlalchemy.orm import relation
   5 from sqlalchemy.types import DateTime, Enum, Integer, Unicode
   6
   7 from spline.model.meta import TableBase
   8 from splinext.users import model as users_model
   9
  10
  11 ### Core
  12
  13 class Forum(TableBase):
  14     __tablename__ = 'forums'
  15     id = Column(Integer, primary_key=True, autoincrement=True, nullable=False)
  16     name = Column(Unicode(133), nullable=False)
  17     description = Column(Unicode(1024), nullable=False, default=u'', server_default=u'')
  18     access_level = Column(Enum(u'normal', u'soapbox', u'archive', name='forums_access_level'), nullable=False, default=u'normal', server_default=u'normal')
  19
  20     def can_create_thread(self, user):
  21         """Returns True ifff the named user can make a new thread in this
  22         forum.
  23         """
  24         if not user.can('forum:create-thread'):
  25             return False
  26
  27         if self.access_level == u'soapbox' and \
  28             not user.can('forum:override-soapbox'):
  29             return False
  30
  31         if self.access_level == u'archive' and \
  32             not user.can('forum:override-archive'):
  33             return False
  34
  35         return True
  36
  37 class Thread(TableBase):
  38     __tablename__ = 'threads'
  39     id = Column(Integer, primary_key=True, autoincrement=True, nullable=False)
  40     forum_id = Column(Integer, ForeignKey('forums.id'), nullable=False)
  41     icon = Column(Unicode(32), nullable=True)
  42     subject = Column(Unicode(133), nullable=False)
  43     post_count = Column(Integer, nullable=False, default=0, index=True)
  44
  45     def specific_post(self, position):
  46         """Returns post number `position` in this thread.
  47
  48         Positions are one-indexed.  Negative indexes are allowed.
  49         """
  50
  51         # Handle negative indexes
  52         if position < 0:
  53             position = self.post_count + position + 1
  54
  55         return self.posts.filter_by(position=position).one()
  56
  57     def can_create_post(self, user):
  58         """Returns True ifff the named user can make a new post in this thread.
  59         """
  60         if not user.can('forum:create-post'):
  61             return False
  62
  63         if self.forum.access_level == u'archive' and \
  64             not user.can('forum:override-archive'):
  65             return False
  66
  67         return True
  68
  69 class Post(TableBase):
  70     __tablename__ = 'posts'
  71     id = Column(Integer, primary_key=True, autoincrement=True, nullable=False)
  72     thread_id = Column(Integer, ForeignKey('threads.id'), nullable=False)
  73     position = Column(Integer, nullable=False)
  74     author_user_id = Column(Integer, ForeignKey('users.id'), nullable=False)
  75     posted_time = Column(DateTime, nullable=False, index=True, default=datetime.now)
  76     raw_content = Column(Unicode(5120), nullable=False)
  77     content = Column(Unicode(5120), nullable=False)
  78
  79 Index('thread_position', Post.thread_id, Post.position, unique=True)
  80
  81
  82 # XXX sort by time, how?
  83 Forum.threads = relation(Thread, order_by=Thread.id.desc(), lazy='dynamic', backref='forum')
  84
  85 Thread.posts = relation(Post, order_by=Post.position.asc(), lazy='dynamic', backref='thread')
  86 Thread.first_post = relation(Post, primaryjoin=and_(Post.thread_id == Thread.id, Post.position == 1), uselist=False)
  87 # XXX THIS WILL NEED TO CHANGE when posts can be deleted!  Or change what 'position' means
  88 Thread.last_post = relation(Post, primaryjoin=and_(Post.thread_id == Thread.id, Post.position == Thread.post_count), uselist=False)
  89
  90 Post.author = relation(users_model.User, backref='posts')