125 lines
4.3 KiB
Ruby
125 lines
4.3 KiB
Ruby
# frozen_string_literal: true
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# Redmine - project management software
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# Copyright (C) 2006-2019 Jean-Philippe Lang
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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module Redmine
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module Acts
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module Positioned
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def self.included(base)
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base.extend ClassMethods
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end
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# This extension provides the capabilities for reordering objects in a list.
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# The class needs to have a +position+ column defined as an integer on the
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# mapped database table.
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module ClassMethods
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# Configuration options are:
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#
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# * +scope+ - restricts what is to be considered a list. Must be a symbol
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# or an array of symbols
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def acts_as_positioned(options = {})
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class_attribute :positioned_options
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self.positioned_options = {:scope => Array(options[:scope])}
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send :include, Redmine::Acts::Positioned::InstanceMethods
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before_save :set_default_position
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after_save :update_position
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after_destroy :remove_position
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end
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end
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module InstanceMethods
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def self.included(base)
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base.extend ClassMethods
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end
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private
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def position_scope
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build_position_scope {|c| send(c)}
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end
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def position_scope_was
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# this can be called in after_update or after_destroy callbacks
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# with different methods in Rails 5 for retrieving the previous value
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build_position_scope {|c| send(destroyed? ? "#{c}_was" : "#{c}_before_last_save")}
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end
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def build_position_scope
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condition_hash = self.class.positioned_options[:scope].inject({}) do |h, column|
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h[column] = yield(column)
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h
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end
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self.class.where(condition_hash)
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end
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def set_default_position
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if position.nil?
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self.position = position_scope.maximum(:position).to_i + (new_record? ? 1 : 0)
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end
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end
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def update_position
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if !new_record? && position_scope_changed?
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remove_position
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insert_position
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elsif saved_change_to_position?
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if position_before_last_save.nil?
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insert_position
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else
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shift_positions
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end
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end
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end
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def insert_position
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position_scope.where("position >= ? AND id <> ?", position, id).update_all("position = position + 1")
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end
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def remove_position
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# this can be called in after_update or after_destroy callbacks
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# with different methods in Rails 5 for retrieving the previous value
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previous = destroyed? ? position_was : position_before_last_save
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position_scope_was.where("position >= ? AND id <> ?", previous, id).update_all("position = position - 1")
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end
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def position_scope_changed?
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(saved_changes.keys & self.class.positioned_options[:scope].map(&:to_s)).any?
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end
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def shift_positions
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offset = position_before_last_save <=> position
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min, max = [position, position_before_last_save].sort
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r = position_scope.where("id <> ? AND position BETWEEN ? AND ?", id, min, max).update_all("position = position + #{offset}")
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if r != max - min
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reset_positions_in_list
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end
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end
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def reset_positions_in_list
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position_scope.reorder(:position, :id).pluck(:id).each_with_index do |record_id, p|
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self.class.where(:id => record_id).update_all(:position => p+1)
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end
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end
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end
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end
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end
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end
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ActiveRecord::Base.send :include, Redmine::Acts::Positioned
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