Hi,
I was loking for the gravatar support I've seen in the cookbook, I
downloaded the source code to have a glance on it and noticed that
there's no definition of the gravatar tag, it's simply used in the
cards extensions, this led me to think that's included with hobo,
tried in mi application, but this extension:

<extend tag="card" for="User">
  <old-card>
    <before-heading:><gravatar size='80' param/></before-heading:>
  </old-card>
</extend>

in the application.dryml just leads to an "undefined method `gravatar'
for #<ActionView::Base:0x2f7180c>" error, where is this gravatar
defined? How does it works in the cookbook?

Thank you.
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