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# 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, :scope => :priorities},
"DCAT" => {:label => :enumeration_doc_categories, :model => Document, :foreign_key => :category_id, :scope => :document_categories},
"ACTI" => {:label => :enumeration_activities, :model => TimeEntry, :foreign_key => :activity_id, :scope => :activities}
}.freeze
# Creates a named scope for each type of value. The scope has a +default+ method
# that returns the default value, or nil if no value is set as default.
# Example:
# Enumeration.priorities
# Enumeration.priorities.default
OPTIONS.each do |k, v|
next unless v[:scope]
named_scope v[:scope], :conditions => { :opt => k }, :order => 'position' do
def default
find(:first, :conditions => { :is_default => true })
end
end
end
named_scope :values, lambda {|opt| { :conditions => { :opt => opt }, :order => 'position' } } do
def default
find(:first, :conditions => { :is_default => true })
end
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
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