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|
# frozen_string_literal: true
# Redmine - project management software
# Copyright (C) 2006-2017 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.
module Redmine
module Acts
module Positioned
def self.included(base)
base.extend ClassMethods
end
# This extension provides the capabilities for reordering objects in a list.
# The class needs to have a +position+ column defined as an integer on the
# mapped database table.
module ClassMethods
# Configuration options are:
#
# * +scope+ - restricts what is to be considered a list. Must be a symbol
# or an array of symbols
def acts_as_positioned(options = {})
class_attribute :positioned_options
self.positioned_options = {:scope => Array(options[:scope])}
send :include, Redmine::Acts::Positioned::InstanceMethods
before_save :set_default_position
after_save :update_position
after_destroy :remove_position
end
end
module InstanceMethods
def self.included(base)
base.extend ClassMethods
end
private
def position_scope
build_position_scope {|c| send(c)}
end
def position_scope_was
# this can be called in after_update or after_destroy callbacks
# with different methods in Rails 5 for retrieving the previous value
build_position_scope {|c| send(destroyed? ? "#{c}_was" : "#{c}_before_last_save")}
end
def build_position_scope
condition_hash = self.class.positioned_options[:scope].inject({}) do |h, column|
h[column] = yield(column)
h
end
self.class.where(condition_hash)
end
def set_default_position
if position.nil?
self.position = position_scope.maximum(:position).to_i + (new_record? ? 1 : 0)
end
end
def update_position
if !new_record? && position_scope_changed?
remove_position
insert_position
elsif saved_change_to_position?
if position_before_last_save.nil?
insert_position
else
shift_positions
end
end
end
def insert_position
position_scope.where("position >= ? AND id <> ?", position, id).update_all("position = position + 1")
end
def remove_position
# this can be called in after_update or after_destroy callbacks
# with different methods in Rails 5 for retrieving the previous value
previous = destroyed? ? position_was : position_before_last_save
position_scope_was.where("position >= ? AND id <> ?", previous, id).update_all("position = position - 1")
end
def position_scope_changed?
(saved_changes.keys & self.class.positioned_options[:scope].map(&:to_s)).any?
end
def shift_positions
offset = position_before_last_save <=> position
min, max = [position, position_before_last_save].sort
r = position_scope.where("id <> ? AND position BETWEEN ? AND ?", id, min, max).update_all("position = position + #{offset}")
if r != max - min
reset_positions_in_list
end
end
def reset_positions_in_list
position_scope.reorder(:position, :id).pluck(:id).each_with_index do |record_id, p|
self.class.where(:id => record_id).update_all(:position => p+1)
end
end
end
end
end
end
ActiveRecord::Base.send :include, Redmine::Acts::Positioned
|
