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# 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 NestedSet
module ProjectNestedSet
def self.included(base)
base.class_eval do
belongs_to :parent, :class_name => self.name
before_create :add_to_nested_set
before_update :move_in_nested_set, :if => lambda {|project| project.parent_id_changed? || project.name_changed?}
before_destroy :destroy_children
end
base.extend ClassMethods
base.send :include, Redmine::NestedSet::Traversing
end
private
def target_lft
siblings_rgt = self.class.where(:parent_id => parent_id).where("name < ?", name).maximum(:rgt)
if siblings_rgt
siblings_rgt + 1
elsif parent_id
parent_lft = self.class.where(:id => parent_id).pluck(:lft).first
raise "Project id=#{id} with parent_id=#{parent_id}: parent missing or without 'lft' value" unless parent_lft
parent_lft + 1
else
1
end
end
def add_to_nested_set(lock=true)
lock_nested_set if lock
self.lft = target_lft
self.rgt = lft + 1
self.class.where("lft >= ? OR rgt >= ?", lft, lft).update_all([
"lft = CASE WHEN lft >= :lft THEN lft + 2 ELSE lft END, " +
"rgt = CASE WHEN rgt >= :lft THEN rgt + 2 ELSE rgt END",
{:lft => lft}
])
end
def move_in_nested_set
lock_nested_set
reload_nested_set_values
a = lft
b = rgt
c = target_lft
unless c == a
if c > a
# Moving to the right
d = c - (b - a + 1)
scope = self.class.where(["lft BETWEEN :a AND :c - 1 OR rgt BETWEEN :a AND :c - 1", {:a => a, :c => c}])
scope.update_all([
"lft = CASE WHEN lft BETWEEN :a AND :b THEN lft + (:d - :a) WHEN lft BETWEEN :b + 1 AND :c - 1 THEN lft - (:b - :a + 1) ELSE lft END, " +
"rgt = CASE WHEN rgt BETWEEN :a AND :b THEN rgt + (:d - :a) WHEN rgt BETWEEN :b + 1 AND :c - 1 THEN rgt - (:b - :a + 1) ELSE rgt END",
{:a => a, :b => b, :c => c, :d => d}
])
elsif c < a
# Moving to the left
scope = self.class.where("lft BETWEEN :c AND :b OR rgt BETWEEN :c AND :b", {:a => a, :b => b, :c => c})
scope.update_all([
"lft = CASE WHEN lft BETWEEN :a AND :b THEN lft - (:a - :c) WHEN lft BETWEEN :c AND :a - 1 THEN lft + (:b - :a + 1) ELSE lft END, " +
"rgt = CASE WHEN rgt BETWEEN :a AND :b THEN rgt - (:a - :c) WHEN rgt BETWEEN :c AND :a - 1 THEN rgt + (:b - :a + 1) ELSE rgt END",
{:a => a, :b => b, :c => c, :d => d}
])
end
reload_nested_set_values
end
end
def destroy_children
unless @without_nested_set_update
lock_nested_set
reload_nested_set_values
end
children.each {|c| c.send :destroy_without_nested_set_update}
unless @without_nested_set_update
self.class.where("lft > ? OR rgt > ?", lft, lft).update_all([
"lft = CASE WHEN lft > :lft THEN lft - :shift ELSE lft END, " +
"rgt = CASE WHEN rgt > :lft THEN rgt - :shift ELSE rgt END",
{:lft => lft, :shift => rgt - lft + 1}
])
end
end
def destroy_without_nested_set_update
@without_nested_set_update = true
destroy
end
def reload_nested_set_values
self.lft, self.rgt = Project.where(:id => id).pluck(:lft, :rgt).first
end
def save_nested_set_values
self.class.where(:id => id).update_all(:lft => lft, :rgt => rgt)
end
def move_possible?(project)
new_record? || !is_or_is_ancestor_of?(project)
end
def lock_nested_set
lock = true
if self.class.connection.adapter_name =~ /sqlserver/i
lock = "WITH (ROWLOCK HOLDLOCK UPDLOCK)"
end
self.class.order(:id).lock(lock).ids
end
def nested_set_scope
self.class.order(:lft)
end
def same_nested_set_scope?(project)
true
end
module ClassMethods
def rebuild_tree!
transaction do
reorder(:id).lock.ids
update_all(:lft => nil, :rgt => nil)
rebuild_nodes
end
end
private
def rebuild_nodes(parent_id = nil)
nodes = Project.where(:parent_id => parent_id).where(:rgt => nil, :lft => nil).reorder(:name)
nodes.each do |node|
node.send :add_to_nested_set, false
node.send :save_nested_set_values
rebuild_nodes node.id
end
end
end
end
end
end
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