Chris@1494: # Redmine - project management software
Chris@1494: # Copyright (C) 2006-2014  Jean-Philippe Lang
Chris@1494: #
Chris@1494: # This program is free software; you can redistribute it and/or
Chris@1494: # modify it under the terms of the GNU General Public License
Chris@1494: # as published by the Free Software Foundation; either version 2
Chris@1494: # of the License, or (at your option) any later version.
Chris@1494: #
Chris@1494: # This program is distributed in the hope that it will be useful,
Chris@1494: # but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@1494: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Chris@1494: # GNU General Public License for more details.
Chris@1494: #
Chris@1494: # You should have received a copy of the GNU General Public License
Chris@1494: # along with this program; if not, write to the Free Software
Chris@1494: # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
Chris@1494: 
Chris@1494: class Watcher < ActiveRecord::Base
Chris@1494:   belongs_to :watchable, :polymorphic => true
Chris@1494:   belongs_to :user
Chris@1494: 
Chris@1494:   validates_presence_of :user
Chris@1494:   validates_uniqueness_of :user_id, :scope => [:watchable_type, :watchable_id]
Chris@1494:   validate :validate_user
Chris@1494: 
Chris@1494:   # Returns true if at least one object among objects is watched by user
Chris@1494:   def self.any_watched?(objects, user)
Chris@1494:     objects = objects.reject(&:new_record?)
Chris@1494:     if objects.any?
Chris@1494:       objects.group_by {|object| object.class.base_class}.each do |base_class, objects|
Chris@1494:         if Watcher.where(:watchable_type => base_class.name, :watchable_id => objects.map(&:id), :user_id => user.id).exists?
Chris@1494:           return true
Chris@1494:         end
Chris@1494:       end
Chris@1494:     end
Chris@1494:     false
Chris@1494:   end
Chris@1494: 
Chris@1494:   # Unwatch things that users are no longer allowed to view
Chris@1494:   def self.prune(options={})
Chris@1494:     if options.has_key?(:user)
Chris@1494:       prune_single_user(options[:user], options)
Chris@1494:     else
Chris@1494:       pruned = 0
Chris@1494:       User.where("id IN (SELECT DISTINCT user_id FROM #{table_name})").all.each do |user|
Chris@1494:         pruned += prune_single_user(user, options)
Chris@1494:       end
Chris@1494:       pruned
Chris@1494:     end
Chris@1494:   end
Chris@1494: 
Chris@1494:   protected
Chris@1494: 
Chris@1494:   def validate_user
Chris@1494:     errors.add :user_id, :invalid unless user.nil? || user.active?
Chris@1494:   end
Chris@1494: 
Chris@1494:   private
Chris@1494: 
Chris@1494:   def self.prune_single_user(user, options={})
Chris@1494:     return unless user.is_a?(User)
Chris@1494:     pruned = 0
Chris@1494:     where(:user_id => user.id).all.each do |watcher|
Chris@1494:       next if watcher.watchable.nil?
Chris@1494: 
Chris@1494:       if options.has_key?(:project)
Chris@1494:         next unless watcher.watchable.respond_to?(:project) && watcher.watchable.project == options[:project]
Chris@1494:       end
Chris@1494: 
Chris@1494:       if watcher.watchable.respond_to?(:visible?)
Chris@1494:         unless watcher.watchable.visible?(user)
Chris@1494:           watcher.destroy
Chris@1494:           pruned += 1
Chris@1494:         end
Chris@1494:       end
Chris@1494:     end
Chris@1494:     pruned
Chris@1494:   end
Chris@1494: end