app/models/group.rb

   1 # Groups are used to determine which groups of users have which rights
   2 # on which folders.
   3 class Group < ActiveRecord::Base
   4   has_many :group_permissions
   5
   6   has_and_belongs_to_many :users
   7
   8   validates_uniqueness_of :name
   9   validates_presence_of :name
  10
  11   before_destroy :dont_destroy_admins
  12   # Don't delete 'admins' from the database
  13   def dont_destroy_admins
  14     raise "Can't delete admins group" if self.is_the_administrators_group?
  15   end
  16
  17   after_destroy :destroy_dependant_group_permissions
  18   # Delete dependant group_permissions.
  19   # This code should be executed after_destroy.
  20   def destroy_dependant_group_permissions
  21     self.group_permissions.each do |group_permission|
  22       group_permission.destroy
  23     end
  24   end
  25
  26   # Returns whether or not the admins group exists
  27   def self.admins_group_exists?
  28     group = Group.find_by_is_the_administrators_group(true)
  29     return (not group.blank?)
  30   end
  31
  32   # Create admins group and add admin user to it.
  33   def self.create_admins_group
  34     if User.admin_exists? # and Group.admins_group_exists?
  35       group = Group.new
  36       group.name = 'admins'
  37       group.is_the_administrators_group = true
  38
  39       # Add the adminstrator to this group:
  40       if user = User.find_by_is_the_administrator(true)
  41         user.groups.push(group)
  42       end
  43
  44       group.save # save, so true is returned
  45     end
  46   end
  47 end