查询文档 - 基于作为文档列表一部分的对象的属性

Question

我正在尝试获取符合以下条件的所有文档，但结果似乎不正确。

Criteria : Movies which have release date matching the given range and this release timeline is active

isActive=true and releaseDate >= 2020-04-20 and releaseDate <= 2020-04-21

每个文档都是 Movie 类型，其中包含一个 movieTimeline 对象列表，每个 movieTimeline 都有一个 isActive 和 releaseDate 属性。文档中的任何时候都可以激活单个 movieTimeline。

文档结构 -

@Document
public class Movie extends BaseDocument
{
    private String name;
    private List<MovieTimeline> movieTimelines;
...

public class MovieTimeline
{
    private Boolean isActive;
    private LocalDateTime releaseDate;
    private String description;
...

发布日期属性是Java中的LocalDateTime类型，存储在2020-04-20T05:00:00.000+00:00数据库中的格式。

这是我尝试检索数据的代码-

@Repository
public interface MovieRepository extends MongoRepository<Movie,String>
{
    List<Movie> findByMovieTimelines_ReleaseDateBetweenAndMovieTimelines_IsActive(LocalDateTime from, LocalDateTime to, boolean isActive);
}

样本数据-

{
"id": "abc",
"name": "Rango",
"movieTimelines": [{
        "isActive": false,
        "releaseDate": "2020-02-10T11:30:00",
        "description": "ORIGINAL TIMELINE"
    }, {
        "isActive": true,
        "releaseDate": "2020-06-15T10:30:00",
        "description": "New Timeline created on 03/10/2020"
    }
]
}, {
    "id": "abcv",
    "name": "Fight Club",
    "movieTimelines": [{
            "isActive": false,
            "releaseDate": "2020-02-10T11:30:00",
            "description": "ORIGINAL TIMELINE"
        }, {
            "isActive": true,
            "releaseDate": "2020-05-18T10:30:00",
            "description": "New Timeline created on 02/05/2020"
        }
    ]
}, {
    "id": "asd",
    "name": "Death Note",
    "movieTimelines": [{
            "isActive": false,
            "releaseDate": "2020-03-09T10:30:00",
            "description": "ORIGINAL TIMELINE"
        }, {
            "isActive": false,
            "releaseDate": "2020-03-16T10:30:00",
            "description": "New Timeline created on 02/05/2020"
        }, {
            "isActive": false,
            "releaseDate": "2020-04-20T10:30:00",
            "description": "New Timeline created on 03/06/2020"
        }, {
            "isActive": true,
            "releaseDate": "2020-04-20T10:30:00",
            "description": "New Timeline created on 03/06/2020"
        }
    ]
}, {
    "id": "gfj",
    "name": "Andhadhun",
    "movieTimelines": [{
            "isActive": false,
            "releaseDate": "2020-04-13T10:30:00",
            "description": "ORIGINAL TIMELINE"
        }, {
            "isActive": true,
            "releaseDate": "2020-07-20T10:30:00",
            "description": "New Timeline created on 03/09/2020"
        }
    ]
}, {
    "id": "nojh",
    "name": "Evan Almighty",
    "movieTimelines": [{
            "isActive": true,
            "releaseDate": "2020-04-20T10:30:00",
            "description": "ORIGINAL TIMELINE"
        }
    ]
}

预期-

{
    "id": "asd",
    "name": "Death Note",
    "movieTimelines": [{
            "isActive": false,
            "releaseDate": "2020-03-09T10:30:00",
            "description": "ORIGINAL TIMELINE"
        }, {
            "isActive": false,
            "releaseDate": "2020-03-16T10:30:00",
            "description": "New Timeline created on 02/05/2020"
        }, {
            "isActive": false,
            "releaseDate": "2020-04-20T10:30:00",
            "description": "New Timeline created on 03/06/2020"
        }, {
            "isActive": true,
            "releaseDate": "2020-04-20T10:30:00",
            "description": "New Timeline created on 03/06/2020"
        }
    ]
},{
    "id": "nojh",
    "name": "Evan Almighty",
    "movieTimelines": [{
            "isActive": true,
            "releaseDate": "2020-04-20T10:30:00",
            "description": "ORIGINAL TIMELINE"
        }
    ]
}

MongoDB 是否有任何过滤器或运算符可用于在单个查询中获取这些文档？

Answer 1

MongoDB提供了$elemMatch投影算子应该可以满足你的条件

特别是，您的文档由一系列文档组成。因此，这是另一个 reference，您可以使用它来构建此类数据的查询。

这是我在使用您的条件和示例数据进行测试时发现的结果。我的查询是 Mongo Shell 而不是 Java/Spring，所以请用所需的语言重写它。

由于您只想获取那些具有活动电影时间轴的文档，因此 "movieTimelines" 中的 "isActive" 属性必须为真。使用以下查询可以单独满足此条件：

db.collectionName.find({ "movieTimelines": { $elemMatch: { "isActive": true } } })

发布日期也需要在给定范围内，这意味着查询需要解决 "movieTimelines" 中的 "releaseDate" 属性。这个条件可以这样查询：

db.collectionName.find({ "movieTimelines": { $elemMatch: { "releaseDate": { $gte: ISODate("2020-04-20T00:00:00"), $lte: ISODate("2020-04-21T00:00:00") } } } })

或

db.collectionName.find({ "movieTimelines": { $elemMatch: { "releaseDate": { $gte: ISODate("2020-04-20"), $lte: ISODate("2020-04-21") } } } })

对于上述查询，"releaseDate" 值是 "ISODate()" 对象而不是我数据库中的字符串。可以使用 toDate, dateFromString 等聚合器将字符串转换为 ISODate 对象

即使"releaseDate"值为字符串，如果条件中的数据类型更改为字符串，查询也将有效。这可能不是一个好的做法。

db.collectionName.find({ "movieTimelines": { $elemMatch: { "releaseDate": { $gte: "2020-04-20", $lte: "2020-04-21" } } } })

因此，为了同时满足您的两个条件，需要将两个查询合二为一：

db.collectionName.find({ "movieTimelines": { $elemMatch: { "isActive": true, "releaseDate": { $gte: ISODate("2020-04-20T00:00:00"), $lte: ISODate("2020-04-21T00:00:00") } } } })

我希望这能回答你的问题。

查询文档 - 基于作为文档列表一部分的对象的属性

To query documents - based on a property of an object which is part of a list within the document

mongodb

mongodb-query

spring-data-mongodb

查询文档 - 基于作为文档列表一部分的对象的 属性

To query documents - based on a property of an object which is part of a list within the document

mongodb

mongodb-query

spring-data-mongodb

查询文档 - 基于作为文档列表一部分的对象的属性