Chris@1295: module CollectiveIdea #:nodoc:
Chris@1295:   module Acts #:nodoc:
Chris@1295:     module NestedSet #:nodoc:
Chris@1295:       # This module provides some helpers for the model classes using acts_as_nested_set.
Chris@1295:       # It is included by default in all views.
Chris@1295:       #
Chris@1295:       module Helper
Chris@1295:         # Returns options for select.
Chris@1295:         # You can exclude some items from the tree.
Chris@1295:         # You can pass a block receiving an item and returning the string displayed in the select.
Chris@1295:         #
Chris@1295:         # == Params
Chris@1295:         #  * +class_or_item+ - Class name or top level times
Chris@1295:         #  * +mover+ - The item that is being move, used to exlude impossible moves
Chris@1295:         #  * +&block+ - a block that will be used to display: { |item| ... item.name }
Chris@1295:         #
Chris@1295:         # == Usage
Chris@1295:         #
Chris@1295:         #   <%= f.select :parent_id, nested_set_options(Category, @category) {|i|
Chris@1295:         #       "#{'–' * i.level} #{i.name}"
Chris@1295:         #     }) %>
Chris@1295:         #
Chris@1295:         def nested_set_options(class_or_item, mover = nil)
Chris@1295:           if class_or_item.is_a? Array
Chris@1295:             items = class_or_item.reject { |e| !e.root? }
Chris@1295:           else
Chris@1295:             class_or_item = class_or_item.roots if class_or_item.is_a?(Class)
Chris@1295:             items = Array(class_or_item)
Chris@1295:           end
Chris@1295:           result = []
Chris@1295:           items.each do |root|
Chris@1295:             result += root.self_and_descendants.map do |i|
Chris@1295:               if mover.nil? || mover.new_record? || mover.move_possible?(i)
Chris@1295:                 [yield(i), i.id]
Chris@1295:               end
Chris@1295:             end.compact
Chris@1295:           end
Chris@1295:           result
Chris@1295:         end
Chris@1295: 
Chris@1295:       end
Chris@1295:     end
Chris@1295:   end
Chris@1295: end