_form.html.haml

= semantic_form_for @article, html: { class: 'form-horizontal' } do |f|
  = f.inputs do
    = f.input :name
    = f.input :customer unless params.include?(:customer_id)
    = f.input :number
    = f.input :unit_price, as: :currency
    = f.input :comments

  = f.actions do
    = f.action :submit, button_html: { class: 'btn btn-primary' }
    = link_to t('cancel'), @article, class: 'btn'

application.html.haml

!!!
%html
  %head
    %meta{:name => "viewport", :content => "width=device-width, initial-scale=1, maximum-scale=1"}
    %title= content_for?(:title) ? yield(:title) : "Aldor ERP"
    %meta{:content => content_for?(:description) ? yield(:description) : "Aldor ERP", :name => "description"}
    = stylesheet_link_tag    "application", media: "all", "data-turbolinks-track" => true
    = javascript_include_tag "application", "data-turbolinks-track" => true
    = csrf_meta_tags
    = yield(:head)
  %body
    #header
      %h1= link_to 'Aldor ERP', root_path

    #user-nav.navbar.navbar-inverse
      %ul.nav.btn-group
        %li.btn.btn-inverse
          = link_to edit_user_registration_path do
            %i.icon-user
            %span.text Profiel
        %li.btn.btn-inverse
          = link_to destroy_user_session_path, method: :delete do
            %i.icon-share-alt
            %span.text Afmelden

    #sidebar
      = link_to root_path, class: 'visible-phone' do
        %i.icon.icon-home
        %span Dashboard
      %ul
        - if policy(Operation).create?
          %li{class: menu_active_class('operations')}
            = link_to operations_path do
              %i.icon-cogs
              %span= t('Operations')
          %li{class: menu_active_class('operation_clusters')}
            = link_to operation_clusters_path do
              %i.icon-cogs
              %span= t('OperationClusters')
          %li{class: menu_active_class('articles')}
            = link_to articles_path do
              %i.icon-puzzle-piece
              %span= t('Articles')

        %li.submenu{ class: menu_open_class('suppliers','customers','users') }
          = link_to '#', "data-no-turbolink" => "no-turbolink" do
            %i.icon-user
            %span= t('People')
          %ul
            - if policy(Supplier).create?
              %li{class: menu_active_class('suppliers')}
                = link_to suppliers_path do
                  %i.icon-truck
                  %span= t('Suppliers')
            - if policy(Customer).create?
              %li{class: menu_active_class('customers')}
                = link_to customers_path do
                  %i.icon-user
                  %span= t('Customers')
            - if policy(User).create?
              %li{class: menu_active_class('users')}
                = link_to users_path do
                  %i.icon-user
                  %span= t('Users')
        %li{class: menu_active_class('document_categories')}
          = link_to document_categories_path do
            %i.icon-folder-open
            %span= t('DocumentCategories')

    #content
      #content-header
        - if content_for?(:content_header)
          = yield :content_header
        - else
          %h1= yield(:page_title) || 'Geen page_title of content_header aanwezig'

      #breadcrumb
        - @breadcrumbs.each do |item|
          = link_to item[:path], class: (item == @breadcrumbs.last ? 'current' : nil) do
            - if item[:icon]
              %i{class: "icon-#{item[:icon]}"}
            = item[:title]

      .container-fluid
        - if flash.any?
          .row-fluid
            .span12
              = bootstrap_flash

        = yield 
        #tooltip-container

    .row-fluid
      #footer.span12
        %p Aldor ERP

article_policy.rb

class ArticlePolicy < Struct.new(:current_user, :article)

  class Scope < Struct.new(:current_user, :articles)
    def resolve
      if current_user.present? && current_user.admin?
        articles
      else
        articles.none
      end
    end
  end

  def new?
    current_user.present? && current_user.admin?
  end

  alias_method :create?, :new? 
  alias_method :show?, :new? 
  alias_method :edit?, :new? 
  alias_method :update?, :new? 
  alias_method :destroy?, :new?

  alias_method :apply_cluster?, :new?
  
  def permitted_attributes
    [
      :customer_id,
      :number,
      :unit_price,
      :name,
      :comments,
      :apply_operation_cluster_id
    ]
  end
end

articles_controller.rb

class ArticlesController < ApplicationController
  before_action :set_breadcrumb

  def index
    @articles = policy_scope(Article.all).includes(:customer).order("customers.company_name, name")
    @articles = @articles.filter(params[:query], :company_name, :name, :number) if params[:query]
    @articles = @articles.page params[:page]
  end

  def show
    authorize @article
  end

  def new
    @article = Article.new
    authorize @article
  end

  def create
    if @customer
      @article = @customer.articles.build(article_attributes)
    else
      @article = Article.new(article_attributes)
    end

    authorize @article

    if @article.save
      redirect_to @article, notice: t('notices.created', model: t('Article'))
    else
      render :new
    end
  end

  def edit
    authorize @article
  end

  def update
    authorize @article

    if @article.update_attributes(article_attributes)
      redirect_to @article, notice: t('notices.updated', model: t('Article'))
    elsif article_attributes.include?(:apply_operation_cluster_id)
      @operation_clusters = policy_scope(OperationCluster.all).order(:name)
      render :apply_cluster
    else
      render :edit
    end
  end

  def destroy
    authorize @article
    @article.destroy
    redirect_to @customer, notice: t('notices.destroyed', model: t('Article'))
  end

  def apply_cluster
    authorize @article

    @operation_clusters = policy_scope(OperationCluster.all).order(:name)
  end

  private

  def article_attributes
    params.require(:article).permit(policy(Article).permitted_attributes)
  end

  def set_breadcrumb
    params[:id] && @article = Article.find(params[:id])
    params[:customer_id] && @customer = Customer.find(params[:customer_id])

    @customer = @article.customer if @article

    @breadcrumbs << { path: customers_path, title: t('Customers'), icon: 'user' }
    @breadcrumbs << { path: @customer, title: @customer.company_name, icon: 'user' } if @customer

    @breadcrumbs << { path: articles_path, title: t('Articles'), icon: 'puzzle-piece' }
    @breadcrumbs << { path: @article, title: @article.name, icon: 'puzzle-piece' } if @article
    
    @breadcrumbs << { path: [:apply_cluster, @article], title: t('.breadcrumb'), icon: 'cogs' } if params[:action] == "apply_cluster"
  end
end

gistfile1.txt

Started GET "/articles/new" for 213.93.230.243 at 2013-10-08 13:51:27 +0200
Processing by ArticlesController#new as HTML
  User Load (0.4ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 ORDER BY `users`.`id` ASC LIMIT 1
  Ability Load (0.3ms)  SELECT `abilities`.* FROM `abilities` WHERE `abilities`.`user_id` = 1 AND `abilities`.`key` = 'all'
  Customer Load (0.3ms)  SELECT `customers`.* FROM `customers`
  Rendered articles/_form.html.haml (51.3ms)
  Rendered articles/new.html.haml within layouts/application (53.9ms)
Completed 500 Internal Server Error in 66ms

new.html.haml

- content_for :content_header do
  %h1
    = page_title t('.title')

.widget-box
  .widget-title
    %span.icon
      %i.icon-th
    %h5= t('properties')
  .widget-content.nopadding
    = render 'form'