[英]JOLT shift transformation to filter values in array
I want to use a JOLT transformation to do two things:我想使用 JOLT 转换来做两件事:
Input:输入:
{
"isError": false,
"isValid": true,
"myarray": [
{
"p_0001": "1",
"p_0002": "1",
"p_0003": "1",
"p_0004": "1",
"v_518": "0,214506186",
"lfdn": 89709
},
{
"p_0001": "2",
"p_0002": "1",
"p_0003": "1",
"v_518": "0,3823236",
"lfdn": 89710
},
{
"p_0001": "3",
"p_0002": "1",
"p_0003": "1",
"lfdn": 89711
}
],
"errorMessage": null,
"exceptionMessage": null,
"innerExceptionMessage": null
}
Desired output:所需的 output:
{
"isError": false,
"isValid": true,
"myarray": [
{
"v_518": "0,214506186",
"lfdn": 89709
},
{
"v_518": "0,3823236",
"lfdn": 89710
}
],
"errorMessage": null,
"exceptionMessage": null,
"innerExceptionMessage": null
}
What I tried so far, but doesn't work as intended:到目前为止我尝试过的,但没有按预期工作:
[
{
"operation": "shift",
"spec": {
"isError": "isError",
"isValid": "isValid",
"myarray": {
// loop thru all the elements in value array
"*": {
"v_518": {
// if the value "v_518" exists
// grab the whole object and write it out to
// a v_518_array array.
"@(1,v_518)": "v_518_array",
"@(1,lfdn)": "v_518_array"
}
}
},
"errorMessage": "errorMessage",
"exceptionMessage": "exceptionMessage",
"innerExceptionMessage": "innerExceptionMessage"
}
}
]
I tried working with the examples in http://jolt-demo.appspot.com/#andrewkcarter2 but I couldn't figure out how to do it.我尝试使用http://jolt-demo.appspot.com/#andrewkcarter2中的示例,但我不知道该怎么做。
I was able to solve my issue.我能够解决我的问题。 This answer was the hint I needed to get the ball rolling: https://stackoverflow.com/a/38154541/1561441这个答案是我需要让球滚动的提示: https://stackoverflow.com/a/38154541/1561441
The key is referencing the array you are currently transforming via "value" = "array[&1].value"
.关键是通过"value" = "array[&1].value"
引用您当前正在转换的数组。
In my mind I spent way too much time on this issue.在我看来,我在这个问题上花了太多时间。 Does anyone know of a good documentation for the Jolt syntax?有人知道 Jolt 语法的好文档吗? I couldn't find a satisfactory one by googling myself.我自己用谷歌搜索找不到满意的。
[
{
"operation": "shift",
"spec": {
"isError": "isError",
"isValid": "isValid",
"myarray": {
// loop thru all the elements in value array
"*": {
"v_518": {
// if the value "v_518" exists
// grab the whole object and write it out to
// a v_518_array array.
"@1": "v_518_array"
}
}
},
"errorMessage": "errorMessage",
"exceptionMessage": "exceptionMessage",
"innerExceptionMessage": "innerExceptionMessage"
}
},
{
"operation": "shift",
//Transform array: https://stackoverflow.com/questions/37865871/how-do-i-transform-an-array-using-jolt
"spec": {
"v_518_array": {
// loop thru all the elements in value array
"*": {
"v_518": "v_518_array[&1].v_518",
"lfdn": "v_518_array[&1].lfdn"
}
}
}
}
]
Here's a slightly better solution:这是一个稍微好一点的解决方案:
[
{
"operation": "shift",
"spec": {
"isError": "isError",
"isValid": "isValid",
"myarray": {
// loop thru all the elements in value array
"*": {
"v_518": {
// if the value "v_518" exists
// grab the whole object and write it out to
// a v_518_array array.
"@1": "v_518_array"
}
}
},
"errorMessage": "errorMessage",
"exceptionMessage": "exceptionMessage",
"innerExceptionMessage": "innerExceptionMessage"
}
},
{
"operation": "shift",
//Transform array: https://stackoverflow.com/questions/37865871/how-do-i-transform-an-array-using-jolt
"spec": {
"v_518_array": {
// loop thru all the elements in value array
"*": {
"v_518": "&2[&1].v_518", //notice the generic shorthand here
"lfdn": "&2[&1].lfdn"
}
}
}
}
]
Still there's a briefer, and more dynamic method to figure out your issue such as还有一种更简洁、更动态的方法来解决您的问题,例如
[
{
"operation": "shift",
"spec": {
"myarray": {
"*": {
"v_518": {
"@(1,&)": "&3.[&2].&",
"@(1,lfdn)": "&3.[&2].lfdn"
}
}
},
"*": "&"
}
}
]
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