问题描述
我得到两个不同的文件,其中包含股票信息,我想在汇总数据时将它们合并到一个文件中,基于“pid”。
有效载荷A
{
"order": [
{
"pid": "a","instock": "2"
},{
"pid": "b",{
"pid": "c","instock": "2"
}
]
}
有效载荷B
{
"order": [
{
"pid": "c",{
"pid": "d","instock": "2"
}
]
}
结果 有效载荷A
{
"order": [
{
"pid": "a","instock": "4"
},"instock": "2"
}
]
}
但我正在努力解决的是边缘情况:
{
"order": []
}
解决方法
您可以尝试以下 DataWeave 表达式:
%dw 2.0
output application/json
import * from dw::core::Arrays
var payloadA = {
"order": [
{
"pid": "a","instock": "2"
},{
"pid": "b",{
"pid": "c","instock": "2"
}
]
}
var payloadB = {
"order": [
{
"pid": "c",{
"pid": "d","instock": "2"
}
]
}
---
"order": outerJoin(payloadA.order,payloadB.order,(itemA) -> itemA.pid,(itemB) -> itemB.pid) map (item,index) -> {
"pid": item.l.pid default item.r.pid,"instock": (item.l.instock default 0) + (item.r.instock default 0)
}
输出:
{
"order": [
{
"pid": "a","instock": 2
},"instock": 4
},"instock": 2
}
]
}