#{Rails.root}/app/helper/application_helper.rb

application_helper.rb

module ApplicationHelper
  # [example]
  # simple_table(["A", "B", "C"], [ ["a1", "b1", "c1"], ["a2", "b2", "c2"] ], {:table => { :id => "hoge", :class => "huga"}, :tr => { :class => "piyo"}})
  #  => 
  #  <table id="hoge" class="huga">
  #    <thead>
  #        <tr class="piyo">
  #         <th>A</th>
  #         <th>B</th>
  #         <th>C</th>
  #        </tr>
  #      </thead>
  #      <tbody>
  #        <tr class="piyo">
  #          <td>a1</td>
  #          <td>b1</td>
  #          <td>c1</td>
  #        </tr>
  #        <tr class="piyo">
  #          <td>a2</td>
  #          <td>b2</td>
  #          <td>c2</td>
  #        </tr>
  #      </tbody>
  #    </thead>
  #  </table>
  def simple_table(head_contents, row_contents, html_options = {})
    tr_tags = []

    content_tag(:table, html_options[:table] ) do
      head = content_tag(:thead) do
        content_tag(:tr, html_options[:tr]) do
          head_contents.each do |content|
            concat content_tag(:th, content, html_options[:th])
          end
        end
      end

      body = content_tag(:tbody) do
        row_contents.each do |row|
          tmp = content_tag(:tr, html_options[:tr]) do
            row.each do |content2|
              concat content_tag(:td, content2, html_options[:td])
            end
          end
          tr_tags << tmp
        end
        tr_tags.each do |tag|
          concat tag
        end
      end

      head + body
    end
  end
  
  # [sample1]
  # simple_list(["a", "b", "c"], { :ol => true, :li => { :class => "item"} } )
  #  =>
  #  <ol>
  #    <li class="item">a</li>
  #    <li class="item">b</li>
  #    <li class="item">c</li>
  #  </ol>
  # [sample2]
  # simple_list(["a", "b", "c"], { :ul => { :id => "hoge", :class => "huga"}, :li => { :class => "piyo" } } ) 
  #  =>
  #  <ul id="hoge" class="huga">
  #    <li class="piyo">a</li>
  #    <li class="piyo">b</li>
  #    <li class="piyo">c</li>
  #  </ul>
  def simple_list(items, html_options = {})
    if html_options[:ol].present?
      type = :ol
    else
      type = :ul
    end

    content_tag(type, html_options[type]) do
      items.each do |item|
        concat content_tag(:li, item, html_options[:li])
      end
    end
  end
  
  # how to use : same link_to helper
  def link_to_only_valid_path(*args)
    if args.second =~ /^(http:\/\/|https:\/\/)/
      return link_to(*args)
    else
      all_routes = eval(Rails.application.class.parent_name)::Application.routes.routes
      return link_to_if(all_routes.map{ |route| route.path.match(args.second).present? }.include?(true), *args)
    end
  end
end