Support for subforums (#3831).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@10142 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/board.rb

@@ -21,26 +21,37 @@ class Board < ActiveRecord::Base
   has_many :topics, :class_name => 'Message', :conditions => "#{Message.table_name}.parent_id IS NULL", :order => "#{Message.table_name}.created_on DESC"
   has_many :messages, :dependent => :destroy, :order => "#{Message.table_name}.created_on DESC"
   belongs_to :last_message, :class_name => 'Message', :foreign_key => :last_message_id
-  acts_as_list :scope => :project_id
+  acts_as_tree :dependent => :nullify
+  acts_as_list :scope => '(project_id = #{project_id} AND parent_id #{parent_id ? "= #{parent_id}" : "IS NULL"})'
   acts_as_watchable
 
   validates_presence_of :name, :description
   validates_length_of :name, :maximum => 30
   validates_length_of :description, :maximum => 255
+  validate :validate_board
 
   scope :visible, lambda {|*args| { :include => :project,
                                           :conditions => Project.allowed_to_condition(args.shift || User.current, :view_messages, *args) } }
 
-  safe_attributes 'name', 'description', 'move_to'
+  safe_attributes 'name', 'description', 'parent_id', 'move_to'
 
   def visible?(user=User.current)
     !user.nil? && user.allowed_to?(:view_messages, project)
   end
 
+  def reload(*args)
+    @valid_parents = nil
+    super
+  end
+
   def to_s
     name
   end
 
+  def valid_parents
+    @valid_parents ||= project.boards - self_and_descendants
+  end
+
   def reset_counters!
     self.class.reset_counters!(id)
   end
@@ -53,4 +64,26 @@ class Board < ActiveRecord::Base
                " last_message_id = (SELECT MAX(id) FROM #{Message.table_name} WHERE board_id=#{board_id})",
                ["id = ?", board_id])
   end
+
+  def self.board_tree(boards, parent_id=nil, level=0)
+    tree = []
+    boards.select {|board| board.parent_id == parent_id}.sort_by(&:position).each do |board|
+      tree << [board, level]
+      tree += board_tree(boards, board.id, level+1)
+    end
+    if block_given?
+      tree.each do |board, level|
+        yield board, level
+      end
+    end
+    tree
+  end
+
+  protected
+
+  def validate_board
+    if parent_id && parent_id_changed?
+      errors.add(:parent_id, :invalid) unless valid_parents.include?(parent)
+    end
+  end
 end