Rails partial for rendering collections as an HTML table

_collection_as_table.html.erb

<!--
  Renders a collection of objects in an HTML table (developed under Rails 4.0). 
  
  locals:
    * size: The size of the collection (required to determine when to close the table)
    * ignore (optional): array of symbols which map to object attributes which won't be rendered in the table
    * calls (optional): array of strings which map to methods to call against each object
    * table_class (optional): class value to use for the table
    * table_id (optional): id to use for the table
    * style (optional): style value to use for the table

  Example usage:

  render partial: "collection_as_table", collection: @users, as: :item,
   locals: {
           size: @users.count,
           ignore: [:updated_at, :created at],
           calls: [['fullname'], ['is_admin.humanize', 'Is Admin?']],
           table_class: 'tablesorter',
           table_id: 'user',
           style: 'background-color: white'
   }
-->

<%
   calls = [] if local_assigns[:calls].nil?
   ignore = [] if local_assigns[:ignore].nil?
   column_headers = item.attributes.keys
   table_class = '' if local_assigns[:table_class].nil?
   table_style = '' if local_assigns[:table_style].nil?
   table_id = '' if local_assigns[:table_id].nil?
%>

<% if item_counter == 0 %>
    <table id="<%= table_id %>" class="<%= table_class %>" style="<%= table_style %>">
      <thead>
      <tr>
        <% column_headers.each do |header| %>
            <% next if ignore.include?(header.to_sym) %>
            <th><%= header.titleize %></th>
        <% end %>

        <% calls.each do |call| %>
            <th>
              <% if call.kind_of?(Array) %>
                  <%= call.last %>
              <% else %>
                  <%= call.split('.').last.titleize %>
              <% end %>
            </th>
        <% end %>
      </tr>
      </thead>
      <tbody>
<% end %>

<tr>
  <% item.attributes.each do |key, value| %>
      <% next if ignore.include?(key.to_sym) %>
      <td><%= value %></td>
  <% end %>
  <% calls.each do |call| %>
      <td>
        <% if call.kind_of?(Array) %>
            <%= item.instance_eval(call.first) rescue nil %>
        <% else %>
            <%= item.instance_eval(call) rescue nil %>
        <% end %>
      </td>
  <% end %>
</tr>

<% if item_counter == size - 1 %>
    </tbody>
    <tfoot>
    </tfoot>
    </table>
<% end %>