mastodon/app/models/status.rb

class Status < ActiveRecord::Base
  belongs_to :account, inverse_of: :statuses

  belongs_to :thread, foreign_key: 'in_reply_to_id', class_name: 'Status', inverse_of: :replies
  belongs_to :reblog, foreign_key: 'reblog_of_id', class_name: 'Status', inverse_of: :reblogs

  has_one :stream_entry, as: :activity

  has_many :favourites, inverse_of: :status, dependent: :destroy
  has_many :reblogs, foreign_key: 'reblog_of_id', class_name: 'Status', inverse_of: :reblog, dependent: :destroy
  has_many :replies, foreign_key: 'in_reply_to_id', class_name: 'Status', inverse_of: :thread
  has_many :mentioned_accounts, class_name: 'Mention', dependent: :destroy

  validates :account, presence: true
  validates :uri, uniqueness: true, unless: 'local?'
  validates :text, presence: true, if: Proc.new { |s| s.local? && !s.reblog? }

  scope :with_counters,      -> { select('statuses.*, (select count(r.id) from statuses as r where r.reblog_of_id = statuses.id) as reblogs_count, (select count(f.id) from favourites as f where f.status_id = statuses.id) as favourites_count') }
  scope :with_includes,      -> { includes(:account, reblog: :account, thread: :account) }
  scope :paginate_by_max_id, -> (limit, max_id) { order('id desc').limit(limit).where(max_id.nil? ? '1=1' : ['id < ?', max_id]) }

  def local?
    self.uri.nil?
  end

  def reblog?
    !self.reblog_of_id.nil?
  end

  def reply?
    !self.in_reply_to_id.nil?
  end

  def verb
    reblog? ? :share : :post
  end

  def object_type
    reply? ? :comment : :note
  end

  def content
    reblog? ? self.reblog.text : self.text
  end

  def target
    self.reblog
  end

  def title
    content
  end

  def reblogs_count
    self.attributes['reblogs_count'] || self.reblogs.count
  end

  def favourites_count
    self.attributes['favourites_count'] || self.favourites.count
  end

  def mentions
    if @mentions.nil?
      @mentions = []
      @mentions << thread.account if reply?
      @mentions << reblog.account if reblog?
      self.mentioned_accounts.each { |mention| @mentions << mention.account } unless reblog?
      @mentions = @mentions.uniq
    end

    @mentions
  end

  def ancestors
    Status.where(id: Status.find_by_sql(['WITH RECURSIVE search_tree(id, in_reply_to_id, path) AS (SELECT id, in_reply_to_id, ARRAY[id] FROM statuses WHERE id = ? UNION ALL SELECT statuses.id, statuses.in_reply_to_id, path || statuses.id FROM search_tree JOIN statuses ON statuses.id = search_tree.in_reply_to_id WHERE NOT statuses.id = ANY(path)) SELECT id FROM search_tree ORDER BY path DESC', self.id]) - [self])
  end

  def descendants
    Status.where(id: Status.find_by_sql(['WITH RECURSIVE search_tree(id, path) AS (SELECT id, ARRAY[id] FROM statuses WHERE id = ? UNION ALL SELECT statuses.id, path || statuses.id FROM search_tree JOIN statuses ON statuses.in_reply_to_id = search_tree.id WHERE NOT statuses.id = ANY(path)) SELECT id FROM search_tree ORDER BY path', self.id]) - [self])
  end

  after_create do
    self.account.stream_entries.create!(activity: self)
  end
end