Looks it can not work will

[huacnlee]

There have wrong lft, rgt value.

And then, I clone lastest source from thinkwell/mongoid_nested_set, and try to write the test case like this graph:

class Comment
  include Mongoid::Document
  acts_as_nested_set :scope => :commentable

  field :body
  belongs_to :commentable, :polymorphic => true
end

context "test with polymorphic model" do
  it "should get right tree" do
    @node = Node.create(:name => 'Foo', :root_id => 0)
    food = Comment.create(:commentable => @node, :body => "Food")
      fruit = food.children.create(:commentable => @node, :body => "Fruit")
        red = fruit.children.create(:commentable => @node, :body => "Red")
          cherry = red.children.create(:commentable => @node, :body => "Cherry")
        yellow = fruit.children.create(:commentable => @node, :body => "Yellow")
          banana = yellow.children.create(:commentable => @node, :body => "Banana")
      meat = food.children.create(:commentable => @node, :body => "Meat")
        beef = meat.children.create(:commentable => @node, :body => "Beef")
        pork = meat.children.create(:commentable => @node, :body => "Pork")

    [food.lft,food.rgt].should == [1,18]
    [fruit.lft,fruit.rgt].should == [2,11]
    [red.lft,red.rgt].should == [3,6]
    [cherry.lft,cherry.rgt].should == [4,5]
    [yellow.lft,yellow.rgt].should == [7,10]
    [banana.lft,banana.rgt].should == [8,9]
    [meat.lft,meat.rgt].should == [12,17]
    [beef.lft,beef.rgt].should == [13,14]
    [pork.lft,pork.rgt].should == [15,16]
  end
end

It can not pass.

[huacnlee]

I have looped the all of comments to see the datas in DB

Comment.each do |c|
  tl = "  "*c.depth
  nl = "#{c.body}"
  print tl, nl
  print "lft: #{c.lft}, rgt: #{c.rgt} ".rjust(80 - tl.length - nl.length)
  puts ""
end

Got this result:

Food                                                            lft: 1, rgt: 18
  Fruit                                                         lft: 2, rgt: 11
    Red                                                          lft: 3, rgt: 6
      Cherry                                                     lft: 4, rgt: 5
    Yellow                                                      lft: 7, rgt: 10
      Banana                                                     lft: 8, rgt: 9
  Meat                                                         lft: 12, rgt: 17
    Beef                                                       lft: 13, rgt: 14
    Pork                                                       lft: 15, rgt: 16

Look like the lft,rgt values in database is right.