Some model

gistfile1.txt

class OpenQuestionnaireGroupsController < ApplicationController
  before_filter :get_resource, :except => :create
  before_filter(
    :find_group_by_group_id,
    :only => [:get_options_for_condition, :get_next_group_select, :update_next_group]
  )

  def show
    respond_to do |format|
      format.js { render :partial => 'group', :object => @open_questionnaire_group }
    end
  end

  def create
    @open_questionnaire = OpenQuestionnaire::Base.find params[:open_questionnaire_id]
    @open_questionnaire_group = @open_questionnaire.groups.create
    render :partial => 'open_questionnaires/group', :object => @open_questionnaire_group
  end
  
  def update
    unless params[:open_questionnaire_group][:position].blank?
      @open_questionnaire_group.insert_at params[:open_questionnaire_group][:position]
      @open_questionnaire_group.check_consistency_after_group_reorder
      render :nothing => true
    else
      if @open_questionnaire_group.update_attributes params[:open_questionnaire_group]
        render :text => params[:open_questionnaire_group][:name]
      else
        render :json => @open_questionnaire_group.errors.full_messages, :status => :conflict
      end
    end
  end
  
  def destroy
    unless @open_questionnaire_group.destroy
      render :json => @open_questionnaire_group.errors.full_messages
    else
      @open_questionnaire_group.check_group_consistency :after_destroy
      render :json => []
    end
  end

  def get_next_group_select
    if @group.is_target_of_condition_question?
      groups = OpenQuestionnaire::Group.find(params[:group_id]).next_groups
      render :partial => 'next_group_select', :locals => { :groups => groups }
    else
      render :text => nil
    end
  end

  def update_next_group
    @group.update_attribute :next_group_id, params[:next_group_id]
    render :text => nil
  end

  protected

  def find_group_by_group_id
    @group = OpenQuestionnaire::Group.find params[:group_id]
  end

  def get_resource
    @open_questionnaire_group = OpenQuestionnaire::Group.find params[:id] if params[:id]
  end
end