Json GO KaZaam转换返回意外结果

发布于12月06日

我正在使用kazaam模块来定义json转换. https://github.com/qntfy/kazaam个

以下是我的规则:

"rules": [
        {
            "operation": "shift",
            "spec": {
                "Shift": "instruction.context.example1"
            }
        },
        {
            "operation": "concat",
            "spec": {
                "sources": [
                    {
                        "path": "instruction.context.example1"
                    },
                    {
                        "path": "instruction.context.example2"
                    }
                ],
                "targetPath": "Concat",
                "delim": "_"
            }
        },
        {
            "operation": "coalesce",
            "spec": {
                "Coalesce": [
                    "instruction.context.example3[0].id"
                ]
            }
        }
    ]

适用于此JSON:

{
    "instruction": {
        "context": {
            "example1": "example1 value",
            "example2": "example2 value",
            "example3": [
                {
                    "id": "example3_1_value"
                },
                {
                    "id": "example3_2_value"
                },
                {
                    "id": "example3_3_value"
                }
            ]
        }
    }
}

结果是:

{
    "Shift": "example1 value",
    "Concat": "null_null"
}

因此，第一个操作起作用，第二个操作返回NULL_NULL，第三个操作不出现.

推荐答案

这些规则被一个接一个地apply.您的第一条规则产生的内容将作为第二条规则的输入，依此类推，它们是连锁的.因此，您首先转换生成一个对象:

{
  "Shift": "example1 value"
}

and when the above is given as an input to your second operation - you get the null values, since the fields you're referring to - do no exist.
You could try to change the first rule to:

        {
            "operation": "shift",
            "spec": {
                "Shift": "instruction.context.example1",
                "instruction.context.example1": "instruction.context.example1",
                "instruction.context.example2": "instruction.context.example2"
            }
        },

看看它的效果