MongoDB 查找不遵循排序规则

MongoDB find does not follow collation rule

我想在 membershipAccount collection 上创建一个索引,它有一个整理规则集,允许 find 方法找到 username 而 case-insensitive ].

[
    2,
    {
        "username" : 1.0
    },
    "username_1",
    "kollecto_prod.membershipAccounts",
    {
        "locale" : "da",
        "caseLevel" : false,
        "caseFirst" : "off",
        "strength" : 1,
        "numericOrdering" : false,
        "alternate" : "non-ignorable",
        "maxVariable" : "punct",
        "normalization" : false,
        "backwards" : false,
        "version" : "57.1"
    }
]

我的 membershipAccountscollection 中有一个名为 - user@test.com 的用户。 但这是我查找查询的结果:

db.getCollection('membershipAccounts').find({username: "user@test.com"}) // 1 result - ok
db.getCollection('membershipAccounts').find({username: "USER@test.com"}) // 0 results - nope
db.getCollection('membershipAccounts').find({username: "USER@TEST.com"}) // 0 results - nope
db.getCollection('membershipAccounts').find({username: "USER@TEST.COM"}) // 0 results - nope

是我的整理不正确还是我误解了这个概念?

所以我最终做的是在我的代码中如下:

var account = DBHelper.membershipAccountCollection.Find(
    x => x.Username.ToLower().Contains(username)
).FirstOrDefault();

var cu = DBHelper.customerUserCollection.AsQueryable().First(
    x => x.Email.ToLower().Contains(model.UserName)
);

这是可行的,因为我的 C# 代码中已经有了集合对象,所以我可以通过这种方式利用 C# 的强大功能。我意识到这不是对整个问题的一般回答,但它适用于我的情况。如果有人对这个问题有更笼统的答案,我很乐意在以后接受这个作为答案。

您需要在查询中设置所需的排序规则,或设置集合的默认排序规则。使用排序规则创建索引不会使该排序规则成为查询中使用的默认排序规则。

每个查询:

MongoDB Enterprise ruby-driver-rs:PRIMARY> db.foo.insert({v:'test'})
WriteResult({ "nInserted" : 1 })
MongoDB Enterprise ruby-driver-rs:PRIMARY> db.foo.find({v:'TEST'}).collation({locale:'en',caseLevel:false,strength:1})
{ "_id" : ObjectId("5ed8302ba6de3bc31c771682"), "v" : "test" }

默认排序规则:

MongoDB Enterprise ruby-driver-rs:PRIMARY> c={locale:'en',caseLevel:false,strength:1}
{ "locale" : "en", "caseLevel" : false, "strength" : 1 }
MongoDB Enterprise ruby-driver-rs:PRIMARY> db.createCollection('bar',{collation:c})
{
        "ok" : 1,
        "$clusterTime" : {
                "clusterTime" : Timestamp(1591226649, 1),
                "signature" : {
                        "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
                        "keyId" : NumberLong(0)
                }
        },
        "operationTime" : Timestamp(1591226649, 1)
}
MongoDB Enterprise ruby-driver-rs:PRIMARY> db.bar.insert({v:'test'})
WriteResult({ "nInserted" : 1 })
MongoDB Enterprise ruby-driver-rs:PRIMARY> db.bar.find({v:'TEST'})
{ "_id" : ObjectId("5ed8311fa6de3bc31c771683"), "v" : "test" }