Module: CollectiveIdea::Acts::NestedSet::Helper

Defined in:
lib/awesome_nested_set/helper.rb

Overview

This module provides some helpers for the model classes using acts_as_nested_set. It is included by default in all views.

Instance Method Summary collapse

Instance Method Details

#nested_set_options(class_or_items, mover = nil) ⇒ Object

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}"
  }) %>



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# File 'lib/awesome_nested_set/helper.rb', line 24

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