这里我有两个文档,我需要找到数组是否存在
"admin"
,哪种方法最好
$in
或
$exists
?
{
"url_name" : "List All Active clients",
"org_url" : "localhost:4523/create_project/active_clients_list",
"site_url" : "create_project/active_clients_list",
"roles" : {
"writer" : [
"get",
"post",
"put"
],
"admin" : [
"get",
"post",
"put"
]
},
"updated_on" : ISODate("2018-08-21T05:09:25.896Z"),
"created_on" : ISODate("2018-08-21T05:09:25.896Z")
}, {
"url_name" : "List All Active clients",
"org_url" : "localhost:4523/create_project/active_clients_list",
"site_url" : "create_project/active_clients_list",
"roles" : {
"writer" : [
"get",
"post",
"put"
]
},
"updated_on" : ISODate("2018-08-21T05:09:34.407Z"),
"created_on" : ISODate("2018-08-21T05:09:34.407Z")
}
考虑两个文档,我需要找到文档在哪里
“管理员”
存在