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=head2 FAQ

=over 4

=item * 获取当个 row

    resultset('Errors')->search( { cond => 'bla' } )->first;
    resultset('Errors')->single( { cond => 'bla' } );

->first 与 ->single 不同之处在于 ->first 会产生 C<cursor>, 而 ->single 不会。所以 single 略微快一点。但是需要注意的几点是

=over 4

=item * single 里不能有属性

    ->single( { cond => 'bla' }, { order_by => 'rating' } ); # Wrong
    ->search( { cond => 'bla' }, { order_by => 'rating' } )->single; # Right

=item * single 只能返回一条记录