Ruby on Rails

Where can I find more information about the new syntax on these:

<%- model_class = @product.class -%>
<h1><%=t '.title', :default => t('helpers.titles.new', :model => model_class.model_name.human,
                               :default => "New #{model_class.model_name.human}") %></h1>
<%= render :partial => 'form' %>

I've been using rails for a little bit and the "model_class = ..." is all new to me, plus I can't make sense of this:

<%=t '.title', :default => t('helpers.titles.new', :model => model_class.model_name.human, :default => "New #{model_class.model_name.human}") %>

Thanks!

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