Question

我试图制作＆＃34;配方＆＃34;，＆＃34;成分＆＃34;和＆＃34;用户＆＃34;节点（作者）。

基本上，作者可以有很多食谱;和食谱与成分有多对多的关系。

我有这个问题：

MATCH (user:User)
WHERE ID(user) = {uid}
CREATE (recipe:Recipe {name:"receta 4"})
WITH ingredient
MATCH (ingredient:Ingredient)
WHERE ID(ingredient) = node(7)
CREATE (recipe)-[ri:HAS {unit: "vasos", cant: 1}]-(ingredient)
WITH ingredient
MATCH (ingredient:Ingredient)
WHERE ID(ingredient) = node(6)
CREATE (recipe)-[ri:HAS {unit: "cditas", cant: 2}]-(ingredient)
CREATE (user)-[:PREPARE]->(recipe)
RETURN recipe

但是，我得到错误：

ingredient not defined (line 4, column 7)
"WITH (ingredient:Ingredient)"
       ^
Neo.ClientError.Statement.InvalidSyntax

此查询的正确格式是什么？

我的js代码：

Recipe.create = function (req, callback) {

    var data = req.body;
    var uid = parseInt(req.params.id);

    var query = [
        'MATCH (user:User)',
        'WHERE ID(user) = {uid}',
        'CREATE (recipe:Recipe {data})',
    ];

    // set ingredients
    var ingId;
    var unit;
    var cant;
    for (var i = data.ingredients.length - 1; i >= 0; i--) {
        ing   = data.ingredients[i];
        ingId = parseInt(ing.id);
        unit  = ing.unit;
        cant  = ing.cant;
        query.push(
            'MATCH (ingredient:Ingredient)',
            'WHERE ID(ingredient) = node(' + ingId + ')',
            'CREATE (recipe)-[ri:HAS {unit: "'+unit+'", cant: '+cant+'}]-(ingredient)'
        );    
    }

    query.push(
        'CREATE (user)-[:PREPARE]->(recipe)',
        'RETURN recipe'
    );

    query.join("\n");

    db.cypher({
        query:query, 
        params:{
            data: data,
            uid: uid
        }
    }, function (err, results) {
        if (err) return callback(err);
        console.log(results)
        callback(null, results);            
    });
};

Answer 1

我认为问题在于WITH子句引用要创建的下一个节点，而不是引用要创建的上一个节点。此外，代码正在尝试创建无向关系。

试试这个：

MATCH (user:User)
WHERE ID(user) = {uid}
CREATE (recipe:Recipe {name:"receta 4"})
WITH recipe
MATCH (ingredient:Ingredient)
WHERE id(ingredient) = 7
CREATE (recipe)-[ri:HAS {unit: "vasos", cant: 1}]->(ingredient)
WITH recipe
MATCH (ingredient:Ingredient)
WHERE ID(ingredient) = 6
CREATE (recipe)-[ri:HAS {unit: "cditas", cant: 2}]->(ingredient)
CREATE (user)-[:PREPARE]->(recipe)
RETURN recipe

Neo4j插入具有各种关系的节点

1 个答案: