def add(self):
<EOL>if '<STR_LIT>' in request.params:<EOL><INDENT>c.prefix = request.params['<STR_LIT>']<EOL><DEDENT>else:<EOL><INDENT>c.prefix = '<STR_LIT>'<EOL><DEDENT>c.search_opt_parent = "<STR_LIT:all>"<EOL>c.search_opt_child = "<STR_LIT:none>"<EOL>return render('<STR_LIT>')<EOL>
Add a prefix.