Formtastic::Helpers::ErrorsHelper#semantic_errors

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Generates an unordered list of error messages on the base object and optionally for a given
set of named attribute. This is idea for rendering a block of error messages at the top of
the form for hidden/special/virtual attributes (the Paperclip Rails plugin does this), or
errors on the base model.

A hash can be used as the last set of arguments to pass HTML attributes to the `<ul>`
wrapper.

@example A list of errors on the base model
  <%= semantic_form_for ... %>
    <%= f.semantic_errors %>
    ...
  <% end %>

@example A list of errors on the base and named attributes
  <%= semantic_form_for ... %>
    <%= f.semantic_errors :something_special %>
    ...
  <% end %>

@example A list of errors on the base model, with custom HTML attributes
  <%= semantic_form_for ... %>
    <%= f.semantic_errors :class => "awesome" %>
    ...
  <% end %>

@example A list of errors on the base model and named attributes, with custom HTML attributes
  <%= semantic_form_for ... %>
    <%= f.semantic_errors :something_special, :something_else, :class => "awesome", :onclick => "Awesome();" %>
    ...
  <% end %>
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