module CollectiveIdea::Acts::NestedSet::Helper
This module provides some helpers for the model classes using acts_as_nested_set. It is included by default in all views.
Public Instance Methods
nested_set_options(class_or_items, mover = nil) { |i| ... }
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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}" }) %>
# File lib/awesome_nested_set/helper.rb 23 def nested_set_options(class_or_items, mover = nil) 24 if class_or_items.is_a? Array 25 items = class_or_items.reject { |e| !e.root? } 26 else 27 class_or_items = class_or_items.roots if class_or_items.respond_to?(:scope) 28 items = Array(class_or_items) 29 end 30 result = [] 31 items.each do |root| 32 result += root.class.associate_parents(root.self_and_descendants).map do |i| 33 if mover.nil? || mover.new_record? || mover.move_possible?(i) 34 [yield(i), i.primary_id] 35 end 36 end.compact 37 end 38 result 39 end