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# Redmine - project management software
# Copyright (C) 2006-2016 Jean-Philippe Lang
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
class Watcher < ActiveRecord::Base
belongs_to :watchable, :polymorphic => true
belongs_to :user
validates_presence_of :user
validates_uniqueness_of :user_id, :scope => [:watchable_type, :watchable_id]
validate :validate_user
attr_protected :id
# Returns true if at least one object among objects is watched by user
def self.any_watched?(objects, user)
objects = objects.reject(&:new_record?)
if objects.any?
objects.group_by {|object| object.class.base_class}.each do |base_class, objects|
if Watcher.where(:watchable_type => base_class.name, :watchable_id => objects.map(&:id), :user_id => user.id).exists?
return true
end
end
end
false
end
# Unwatch things that users are no longer allowed to view
def self.prune(options={})
if options.has_key?(:user)
prune_single_user(options[:user], options)
else
pruned = 0
User.where("id IN (SELECT DISTINCT user_id FROM #{table_name})").each do |user|
pruned += prune_single_user(user, options)
end
pruned
end
end
protected
def validate_user
errors.add :user_id, :invalid unless user.nil? || user.active?
end
private
def self.prune_single_user(user, options={})
return unless user.is_a?(User)
pruned = 0
where(:user_id => user.id).each do |watcher|
next if watcher.watchable.nil?
if options.has_key?(:project)
unless watcher.watchable.respond_to?(:project) &&
watcher.watchable.project == options[:project]
next
end
end
if watcher.watchable.respond_to?(:visible?)
unless watcher.watchable.visible?(user)
watcher.destroy
pruned += 1
end
end
end
pruned
end
end
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