[Question] How to filter str with vertex in K-neighbor API (POST Version)

[ChoelWu]

Feature Description (功能描述)

如何根据节点字符串类型属性筛选节点，例如city属性为Hongkong
请求内容设置如下后
"label": "person",
"properties": {
"city": "P.eq('Hongkong')"
}
报错：
{
"exception": "class org.apache.hugegraph.HugeException",
"message": "Invalid value ''Hongkong'', expect a number",
"cause": "org.apache.hugegraph.HugeException: Can't read json: Unexpected character (''' (code 39)): expected a valid value (JSON String, Number, Array, Object or token 'null', 'true' or 'false')\n at [Source: (String)"'Hongkong'"; line: 1, column: 2]"
}
此外尝试了"city": "P.eq("Hongkong")" 还有 "city": "P.eq(Hongkong)"，均无法筛选节点并报错

[dosubot]

@ChoelWu 你好！我是Dosu，我是一个可以帮助解决错误、回答问题并成为贡献者的机器人。在等待人类维护者期间，我可以帮助你解决问题。

To filter nodes by a string property using the K-neighbor API, you should ensure that the predicate is correctly formatted in the JSON request. The correct syntax for using predicates like P.eq is to use a string representation in the format "P.method(value)". However, it seems there might be an issue with how the value is being interpreted in your JSON.

Here's how you can format your request:

{
    "label": "person",
    "properties": {
        "city": "P.eq(\"Hongkong\")"
    }
}

Make sure that the entire predicate, including the method and the value, is enclosed in double quotes. If you are still encountering errors, ensure that the JSON is correctly formatted and that the Content-Type is set to application/json in your request header to avoid any HTTP 415 Unsupported Media Type errors ^[1].

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