Cypherを使用してツリーからネストされた階層JSONを返す

Question

現在、console.neo4j.orgのサンプルデータを使用して、階層JSONを出力するクエリを記述しています。

例データは

create (Neo:Crew {name:'Neo'}), (Morpheus:Crew {name: 'Morpheus'}), (Trinity:Crew {name: 'Trinity'}), (Cypher:Crew:Matrix {name: 'Cypher'}), (Smith:Matrix {name: 'Agent Smith'}), (Architect:Matrix {name:'The Architect'}), 
(Neo)-[:KNOWS]->(Morpheus), (Neo)-[:LOVES]->(Trinity), (Morpheus)-[:KNOWS]->(Trinity), 
(Morpheus)-[:KNOWS]->(Cypher), (Cypher)-[:KNOWS]->(Smith), (Smith)-[:CODED_BY]->(Architect) 

を使用して作成された理想的な出力は、私は次のクエリ

MATCH p =(:Crew { name: "Neo" })-[q:KNOWS*0..]-m 
RETURN extract(n IN nodes(p)| n) 

を使用して、これを取得しています、今

name:"Neo" 
children: [ 
    { 
    name: "Morpheus", 
    children: [ 
     {name: "Trinity", children: []} 
     {name: "Cypher", children: [ 
     {name: "Agent Smith", children: []} 
     ]} 
    ] 
    } 
] 
} 

を以下の通りです。

[(0:Crew {name:"Neo"})] 
[(0:Crew {name:"Neo"}), (1:Crew {name:"Morpheus"})] 
[(0:Crew {name:"Neo"}), (1:Crew {name:"Morpheus"}), (2:Crew {name:"Trinity"})] 
[(0:Crew {name:"Neo"}), (1:Crew {name:"Morpheus"}), (3:Crew:Matrix {name:"Cypher"})] 
[(0:Crew {name:"Neo"}), (1:Crew {name:"Morpheus"}), (3:Crew:Matrix {name:"Cypher"}), (4:Matrix {name:"Agent Smith"})] 

これを理解するためのヒントはありますか？ありがとう

Answer 1

neo4j 3.xでは、APOC pluginをneo4jサーバーにインストールした後に、apoc.convert.toTreeプロシージャを呼び出して同様の結果を生成できます。例えば

：

{ 
     "_id": 127, 
     "_type": "Crew", 
     "name": "Neo", 
     "knows": [ 
     { 
      "_id": 128, 
      "_type": "Crew", 
      "name": "Morpheus", 
      "knows": [ 
      { 
       "_id": 129, 
       "_type": "Crew", 
       "name": "Trinity" 
      }, 
      { 
       "_id": 130, 
       "_type": "Crew:Matrix", 
       "name": "Cypher", 
       "knows": [ 
       { 
        "_id": 131, 
        "_type": "Matrix", 
        "name": "Agent Smith" 
       } 
       ] 
      } 
      ] 
     } 
     ] 
    }