Why doesn't CAKEPHP use the model name as the key to return data?

Array
(
    [0] => Array
        (
            [ad_list] => Array
                (
                    [cnum] => 153146853056
                    [rnum] => 24549
                    [endtime] => 
                    [title] => aaaaasdfasasdf
                )

        ) ... ...

is a number increasing from zero

Apr.10,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b35c73-2bfca.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b35c73-2bfca.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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