n class='op'>!</span><span class='kw'>self</span><span class='period'>.</span><span class='id identifier rubyid_class'>class</span><span class='period'>.</span><span class='id identifier rubyid_attribute_map'>attribute_map</span><span class='period'>.</span><span class='id identifier rubyid_key?'>key?</span><span class='lparen'>(</span><span class='id identifier rubyid_k'>k</span><span class='period'>.</span><span class='id identifier rubyid_to_sym'>to_sym</span><span class='rparen'>)</span><span class='rpa