JS 功能对象构造函数 - Neo4j 数据库没有方法 'query'

Question

我正在使用 node-neo4j 库以及 node.js、下划线和原型。

我正在尝试拥有一个扩展数据库适配器的模型。先上代码。

BaseModel.js:

var _ = require("underscore"),
    Neo4jAdapter = require('../adapters/neo4j/Adapter');

function BaseModel() {

    _.extend(this, new Neo4jAdapter());
};

module.exports = BaseModel;

Neo4jAdapter.js:

var _ = require("underscore"),
    Neo4j = require('neo4j');

function Neo4jAdapter() {

    this.db = new Neo4j.GraphDatabase('http://localhost:3000');
};

Neo4jAdapter.prototype.insert = function(label, data, callback) {

    console.log('Neo4jAdapter', 'Attempt to insert node');

    if (label == '') throw 'Label is not defined';

    var query = [
        'CREATE (n:LABEL {mdata})',
        'RETURN n'
    ].join('\n').replace('LABEL', label);

    this.db.query(query, data, function (err, results) {
        if (err) throw err;

        console.log(results);

        var result = results[0].n._data.data;
        result.id = results[0].n._data.metadata.id;

        callback(result);
    });
};

module.exports = Neo4jAdapter;

奇怪的是我收到的错误。我不会在此处 post 所有 node.js / express 代码，但我会使用 url 插入插入函数。我得到的回复如下：

Message: Object #

GraphDatabase has no method 'query'

Error: TypeError: Object #

GraphDatabase has no method 'query'

我的问题是： 为什么数据库对象没有函数 query()，即使 docs 说它应该有一个？

可能的原因： 我打赌在调用插入方法时适配器的 db 对象还没有被填充，但是我该怎么做呢？

谢谢

Answer 1

您可能无意中安装了较新的 alpha 版本。

看到这个问题类似的问题：https://github.com/thingdom/node-neo4j/issues/150

Hi @Christopheraburns! Run this for me:

npm ls neo4j

I'm guessing you've installed node-neo4j v2 (we have alpha versions in npm currently), which has breaking changes to the API. The output of that npm ls will tell you if you have node-neo4j v1 or v2 installed (e.g. 1.1.1 vs. 2.0.0-alpha3).

You can downgrade to 1.1.1 by doing:

npm uninstall neo4j npm install neo4j@1.1.1 --save

Alternately, if you're interested in v2 (still a WIP! but almost finished, and pretty stable), here are some temporary links until this gets merged to master:

API docs (WIP): https://github.com/thingdom/node-neo4j/blob/v2/API_v2.md

Hope this helps! Feel free to re-open if this doesn't resolve things for you.

因此，您可能需要卸载neo4j并重新安装旧版本，或者查看v2中的cypher方法。

https://github.com/thingdom/node-neo4j/blob/v2/API_v2.md#cypher

JS 功能对象构造函数 - Neo4j 数据库没有方法 'query'

JS functional object constructor - Neo4j Database has no method 'query'

javascript

database

neo4j

underscore.js

node-neo4j