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# -*- coding: utf-8 -*-
module CollectiveIdea #:nodoc:
module Acts #:nodoc:
module NestedSet #:nodoc:
# This module provides some helpers for the model classes using acts_as_nested_set.
# It is included by default in all views.
#
module Helper
# Returns options for select.
# You can exclude some items from the tree.
# You can pass a block receiving an item and returning the string displayed in the select.
#
# == Params
# * +class_or_items+ - Class name or top level items
# * +mover+ - The item that is being move, used to exclude impossible moves
# * +&block+ - a block that will be used to display: { |item| ... item.name }
#
# == Usage
#
# <%= f.select :parent_id, nested_set_options(Category, @category) {|i|
# "#{'–' * i.level} #{i.name}"
# }) %>
#
def nested_set_options(class_or_items, mover = nil)
if class_or_items.is_a? Array
items = class_or_items.reject { |e| !e.root? }
else
class_or_items = class_or_items.roots if class_or_items.respond_to?(:scope)
items = Array(class_or_items)
end
result = []
items.each do |root|
result += root.class.associate_parents(root.self_and_descendants).map do |i|
if mover.nil? || mover.new_record? || mover.move_possible?(i)
[yield(i), i.primary_id]
end
end.compact
end
result
end
end
end
end
end
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