Pastable version of Find records according to related model

<pre class='prettyprint' language='ruby'># link_categories has_many links
create_table &quot;link_categories&quot;, :force =&gt; true do |t|
  t.string   &quot;name&quot;
  t.datetime &quot;created_at&quot;
  t.datetime &quot;updated_at&quot;
end

create_table &quot;links&quot;, :force =&gt; true do |t|
  t.string   &quot;label&quot;
  t.string   &quot;address&quot;
  t.text     &quot;description&quot;
  t.integer  &quot;link_category_id&quot;
  t.datetime &quot;created_at&quot;
  t.datetime &quot;updated_at&quot;
  t.string   &quot;logo_file_name&quot;
  t.string   &quot;logo_content_type&quot;
  t.integer  &quot;logo_file_size&quot;
  t.datetime &quot;logo_updated_at&quot;
end

# the method i would like to optimize:

def self.all_with_logo
  categories = all
  ret_categories = []
  categories.each do |linkcategory|
    links = []
    linkcategory.links.each do |link|
      if link.logo_file_name
        links &lt;&lt; link
      end
    end
    if links.length &gt; 0
      ret_categories &lt;&lt; linkcategory
    end
  end
  ret_categories
end</pre>
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Pastable version of Find records according to related model