ass='id identifier rubyid_value'>value</span> <span class='op'>=</span> <span class='kw'>self</span><span class='period'>.</span><span class='id identifier rubyid_send'>send</span><span class='lparen'>(</span><span class='id identifier rubyid_attr'>attr</span><span class='rparen'>)</span>
    <span class='kw'>if</span> <span class='id identifier rubyid_value'>value</span><span class='period'>.</span><span class='id identifier rubyid_nil?'>nil?</span>
      <span class='id identifier rubyid_is_nullable'>is_n