使用Neo4jClient從Neo4j到C＃對象結構獲取分層數據

Question

我遇到了一種情況，需要使用neo4jClient將分層對象圖從Neo4j加載到C＃中

我在C＃中有一個Post類作為休假：

public class Post : BaseNode
{
    public Post Parent { get; set; }
    public float Id { get; set; }
    public string Text { get; set; }
    public ICollection<HashTag> HashTags { get; set; }
    public ICollection<IKeyCommand> KeyTags { get; set; }
    public ICollection<NeoDateTime> DueDates { get; set; }
    public IdentityUser Author { get; set; }
    public ICollection<IdentityUser> MentionedUsers { get; set; }
    public ICollection<Team> MentionedTeam { get; set; }
    public ICollection<PostAttachment> Attachments { get; set; }
    public string Priority { get; set; }

}

這是我的圖：

現在，想像一個需要使用父ID來加載圖的所有父項及其所有相關屬性的方法

我已經想到了產生所需Cypher的C＃代碼：

public IList<Post> LoadParents(int id)
    {
        var matchStringTemplate = "(post:Post {{Id:{0}}})-[r:HAS_Parent*]->(parents:Post)";
        var matchString = string.Format(matchStringTemplate, id);

        var q = new CypherFluentQuery(_graphClient) as ICypherFluentQuery;
        q = q.Match(string.Format(matchStringTemplate, id));

        q = q.OptionalMatch("(post:Post)-[mentionedUsersRelation:HAS_MentionedUsers]->(allAssignees:User)");
        q = q.OptionalMatch("(post:Post)-[authorRelation:HAS_Author]->(author:User)");
        q = q.OptionalMatch("(post:Post)-[hashtagRElation:HAS_HashTags]->(hashtags:HashTag)");
        q = q.OptionalMatch("(post:Post)-[HasAttachmentRelation:HAS_Attachments]->(attachment:PostAttachment)");

        q = q.OptionalMatch("(parents:Post)-[pmentionedUsersRelation:HAS_MentionedUsers]->(pallAssignees:User)");
        q = q.OptionalMatch("(parents:Post)-[pauthorRelation:HAS_Author]->(pauthor:User)");
        q = q.OptionalMatch("(parents:Post)-[phashtagRElation:HAS_HashTags]->(phashtags:HashTag)");
        q = q.OptionalMatch("(parents:Post)-[pHasAttachmentRelation:HAS_Attachments]->(pattachment:PostAttachment)");

        var rq = q.Return((post, parents,  allAssignees, author, hashtags, attachment,

            pallAssignees, pauthor, phashtags, pattachment) => new
        {
            Post = post.As<Post>(),
            Parent = parents.As<Post>(),
            Author = author.As<IdentityUser>(),
            MentionedUsers = allAssignees.CollectAsDistinct<IdentityUser>(),
            Attachments = attachment.CollectAsDistinct<PostAttachment>(),
            HashTags = hashtags.CollectAsDistinct<HashTag>()
        })
        .OrderByDescending("post.CreationDate");

        var result = rq.Results;
        var results = result.Select(p => new Post()
        {
            Id = p.Post.Id,

            Text = p.Post.Text,
            CreationDate = p.Post.CreationDate,
            Author = p.Author,
            MentionedUsers = p.MentionedUsers.Select(m => m.Data).ToArray(),
            HashTags = p.HashTags.Select(h => h.Data).ToArray(),
            Attachments = p.Attachments.Select(a => a.Data).ToArray()
        });
        return results.ToList();
    }

密碼將是這樣的：

 MATCH (post:Post {Id:9601})-[r:HAS_Parent*]->(parents:Post)

OPTIONAL MATCH (post:Post)-[mentionedUsersRelation:HAS_MentionedUsers]->(allAssignees:User)
OPTIONAL MATCH (post:Post)-[authorRelation:HAS_Author]->(author:User)
OPTIONAL MATCH (post:Post)-[hashtagRElation:HAS_HashTags]->(hashtags:HashTag)
OPTIONAL MATCH (post:Post)-[HasAttachmentRelation:HAS_Attachments]->(attachment:PostAttachment)
OPTIONAL MATCH (parents:Post)-[pmentionedUsersRelation:HAS_MentionedUsers]->(pallAssignees:User)

OPTIONAL MATCH (parents:Post)-[pauthorRelation:HAS_Author]->(pauthor:User)
OPTIONAL MATCH (parents:Post)-[phashtagRElation:HAS_HashTags]->(phashtags:HashTag)
OPTIONAL MATCH (parents:Post)-[pHasAttachmentRelation:HAS_Attachments]->(pattachment:PostAttachment)
RETURN post AS Post, collect(distinct parents) AS Parent, author AS Author, collect(distinct allAssignees) AS MentionedUsers, collect(distinct attachment) AS Attachments, collect(distinct hashtags) AS HashTags
ORDER BY post.CreationDate DESC

但是問題是我不知道如何將結果加載到post C＃類中的節點及其父級的層次結構中。

密碼結果是我在db上測試查詢時要查找的內容。 但是一切都被C＃對象弄亂了。

這是neo4jDB中的查詢結果：

Answer 1

如果您的Post班有多個家長職位，那么我認為您應該更改

public Post Parent { get; set; }

像

public IEnumerable<Post> Parent { get; set; }

然后，您可以將密碼結果中的所有父節點映射到此屬性