如何使用Jolt变换数组? [英] How do I transform an array using Jolt?
问题描述
在尝试转换类似这样的内容时,我的转换对象得到了一个空值:
I am getting a null value for my transformed object when trying to convert something like this:
{
"employees": [
{ "f_name" : "tom", "l_name" : "smith" },
{ "f_name" : "don", "l_name" : "jones" }
]
}
对此:
{
"employees": [
{ "firstName" : "tom", "lastName" : "smith" },
{ "firstName" : "don", "lastName" : "jones" }
]
}
这是我正在使用的规范:
This is the spec I am using:
[
{
"operation" : "shift",
"spec" : {
"employees" : {
"f_name" : "firstName"
"l_name" : "lastName"
}
}
]
这是我正在使用的代码:
This is the code I am using:
List<Object> chainrSpecJSON = JsonUtils.classpathToList("path/spec.json");
Chainr chainr = Chainr.fromSpec(chainrSpecJSON);
Object inputJSON = JsonUtils.classpathToObject("path/input.json");
Object transformed = chainr.transform(inputJSON);
System.out.println(transformed);
我能够使用与上述相同的规范和代码成功转换以下输入:
I was able to successfully transform the following input with the same spec and code as above:
{
"employees":
{ "firstName" : "tom", "lastName" : "smith" }
}
那我该怎么做才能转换一组员工对象?
So what do I need to do to transform an array of employee objects?
推荐答案
此规范满足您的要求
[
{
"operation": "shift",
"spec": {
"employees": {
"*": {
"f_name": "employees[&1].firstName",
"l_name": "employees[&1].lastName"
}
}
}
}
]
关键是您需要使用"*"循环遍历employees数组的所有元素,然后在递归/匹配到f_name和l_name时,需要使用[& 1引用索引数组],这意味着在树上查找两个级别(从零到一),然后将其用作输出中的索引数组.
The key thing is you need to use a "*" to loop thru all the elements of the employees array, then when you recurse / match down to f_name and l_name, you need to reference the index array using [&1], which means look up the tree two levels, zero then one, and use that as an index array in the output.
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