Hi, I tried to make a simple example with BetterNestedSet and have a problem with the parent_id. Migration: ------------ class CreateItems < ActiveRecord::Migration def self.up create_table :items do |t| # nested set t.integer :root_id t.integer :parent_id t.integer :lft, :null => false t.integer :rgt, :null => false t.string :name, :limit => 255, :null => false, :default => "" t.string :description, :limit => 512, :null => false, :default => "" t.integer :hw_model_id, :null => false t.boolean :deleted, :null => false, :default => false t.timestamps end end def self.down drop_table :items end end In the view for entering a new item there''s a selection box for selecting the parent node (value = id). Request parameters posted to the action create: -------------------------------------------------------------- {"commit"=>"Create", "authenticity_token"=>"6815a1cad4c491f5a243263eafdd4275ba86697b", "item"=>{"name"=>"hdhdfhdfhfh", "hw_model_id"=>"996332897", "description"=>"", "parent_id"=>"11", "workaround_id"=>"11"}} Controller: ------------- def create @item = Item.new(params[:item]) p @item.parent_id <-------------------------- nil ????? p @item.workaround_id @parent = Item.find(@item.workaround_id) if @parent p "parent gefunden" @item.root_id = @parent.root_id end if @item.save if not @parent p "parent nicht gefunden" # this item has no parent, so it is the root of a new tree @item.update_attribute("root_id", @item.id) else @item.move_to_child_of @parent end flash[:notice] = ''Item was successfully created.'' format.html { redirect_to(@item) } <------------------------ error: too few arguments ???? format.xml { render :xml => @item, :status => :created, :location => @item } else format.html { render :action => "new" } format.xml { render :xml => @item.errors, :status => :unprocessable_entity } end end Logfile: -------- Parameters: {"commit"=>"Create", "authenticity_token"=>"6815a1cad4c491f5a243263eafdd4275ba86697b", "action"=>"create", "controller"=>"items", "item"=>{"name"=>"hdhdfhdfhfh", "hw_model_id"=>"996332897", "description"=>"", "parent_id"=>"11", "workaround_id"=>"11"}} [4;35;1mItem Columns (0.031000) SHOW FIELDS FROM `items` WARNING: Can''t mass-assign these protected attributes: parent_id !!!!!!!!!!!!!!!!!!!!!!!! ------------------------- I have installed the plugin svn://rubyforge.org/var/svn/betternestedset/tags/stable/betternestedset and I''m using Rails 2.1.0 Thanks in advance Andrea Psssst! Schon vom neuen WEB.DE MultiMessenger geh?rt? Der kann`s mit allen: *http://www.produkte.web.de/messenger/?did=3123* [http://www.produkte.web.de/messenger/?did=3123] -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://rubyforge.org/pipermail/betternestedset-talk/attachments/20081103/f61b8d43/attachment.html>