Adds a branch for unlimited project hierarchy.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/branches/work@2148 e93f8b46-1217-0410-a6f0-8f06a7374b81

nested_projects/app/models/enumeration.rb

@@ -0,0 +1,81 @@
+# redMine - project management software
+# Copyright (C) 2006  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 Enumeration < ActiveRecord::Base
+  acts_as_list :scope => 'opt = \'#{opt}\''
+
+  before_destroy :check_integrity
+  
+  validates_presence_of :opt, :name
+  validates_uniqueness_of :name, :scope => [:opt]
+  validates_length_of :name, :maximum => 30
+
+  # Single table inheritance would be an option
+  OPTIONS = {
+    "IPRI" => {:label => :enumeration_issue_priorities, :model => Issue, :foreign_key => :priority_id},
+    "DCAT" => {:label => :enumeration_doc_categories, :model => Document, :foreign_key => :category_id},
+    "ACTI" => {:label => :enumeration_activities, :model => TimeEntry, :foreign_key => :activity_id}
+  }.freeze
+  
+  def self.get_values(option)
+    find(:all, :conditions => {:opt => option}, :order => 'position')
+  end
+  
+  def self.default(option)  
+    find(:first, :conditions => {:opt => option, :is_default => true}, :order => 'position')
+  end
+
+  def option_name
+    OPTIONS[self.opt][:label]
+  end
+
+  def before_save
+    if is_default? && is_default_changed?
+      Enumeration.update_all("is_default = #{connection.quoted_false}", {:opt => opt})
+    end
+  end
+  
+  def objects_count
+    OPTIONS[self.opt][:model].count(:conditions => "#{OPTIONS[self.opt][:foreign_key]} = #{id}")
+  end
+  
+  def in_use?
+    self.objects_count != 0
+  end
+  
+  alias :destroy_without_reassign :destroy
+  
+  # Destroy the enumeration
+  # If a enumeration is specified, objects are reassigned
+  def destroy(reassign_to = nil)
+    if reassign_to && reassign_to.is_a?(Enumeration)
+      OPTIONS[self.opt][:model].update_all("#{OPTIONS[self.opt][:foreign_key]} = #{reassign_to.id}", "#{OPTIONS[self.opt][:foreign_key]} = #{id}")
+    end
+    destroy_without_reassign
+  end
+  
+  def <=>(enumeration)
+    position <=> enumeration.position
+  end
+  
+  def to_s; name end
+  
+private
+  def check_integrity
+    raise "Can't delete enumeration" if self.in_use?
+  end
+end