Question

假设我有4张照片，并且我想返回一个列表，该列表首先在Rating desc上排序，第二个在RatingsCount desc上排序。 cypher查询下面给出了正确的结果：

MATCH (n:`Photo`) WHERE n.RatingsCount > 0 RETURN n.Rating, n.RatingsCount ORDER BY n.Rating DESC, n.RatingsCount DESC LIMIT 20

Id 1-Rating 9-Ratingscount 1

Id 3-Rating 7-Ratingscount 2

Id 2-Rating 7-Ratingscount 1

Id 4-Rating 2-Ratingscount 1

不幸的是我无法将其翻译为Neo4jClient。下面的查询给我一个按升序排名和Ratingscount降序排序的照片列表：

var query = await graphClient.Cypher
            .Match("(photo:Photo)")
            .Where((PhotoEntity photo) => photo.RatingsCount > 0);
            .ReturnDistinct((photo) => new
            {
                Photo = photo.As<PhotoEntity>()
            })
            .OrderByDescending("photo.Rating", "photo.RatingsCount")
            .Limit(20)
            .ResultsAsync;

Id 4-Rating 2-Ratingscount 1

Id 3-Rating 7-Ratingscount 2

Id 2-Rating 7-Ratingscount 1

Id 1-Rating 9-Ratingscount 1

如果我更改了Rating和RatingsCount的顺序，我会以更奇怪的顺序得到照片:)我在这里做错了什么线索？

var query = await graphClient.Cypher
                .Match("(photo:Photo)")
                .Where((PhotoEntity photo) => photo.RatingsCount > 0);
                .ReturnDistinct((photo) => new
                {
                    Photo = photo.As<PhotoEntity>()
                })
                .OrderByDescending("photo.RatingsCount", "photo.Rating")
                .Limit(20)
                .ResultsAsync;

Id 1-Rating 9-Ratingscount 1

Id 2-Rating 7-Ratingscount 1

Id 4-Rating 2-Ratingscount 1

Id 3-Rating 7-Ratingscount 2

Answer 1

我看了一下Neo4jClient的来源，OrderByDescending()简单string.join()s用逗号来表示其参数，并添加了“DESC＆＃39;在末尾。换句话说：它对除了最后一个属性之外的每个属性进行ASC排序。我同意这是违反直觉的，所以我倾向于避免它。

您可以改为使用OrderBy()：

OrderBy("photo.RatingsCount DESC, photo.Rating DESC")

在Neo4jClient中命令设置多个属性

1 个答案: