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<!--
    HTML5 data- attributes using RESTful approach
    HTML5 specifies extensible attributes like data-foo=“bar” (or as in Twitter Bootstrap data-toggle=“modal”), which poses two problems for Rails.
    
    First, if you’re using symbol notation in link_to (for instance) to specify attributes, this fails (dash is not a valid symbol character), so:
-->
    <% link_to('Edit', '../main.html', :class => "btn", :data-toggle => "modal") %> <!-- INVALID!! -->

<!--
    There are two solutions:
    1. put the symbols in quotes,
    2. use the special ":data" hash
-->

    <% link_to('Edit', '../main.html', :class => "btn", :'data-toggle' => "modal") %> <!-- SOLUTION 1 -->
    <% link_to('Edit', '../main.html', :class => "btn", :data{:toggle => "modal"}) %> <!-- SOLUTION 2 -->


<!-- Credit goes to: To Harrison JR (http://apidock.com/rails/ActionView/Helpers/UrlHelper/link_to#1286-HTML5-data-attributes-using-RESTful-approach)  -->