我一直在研究如何使用从网络服务收到的json
来转换 jq
文件,以删除深度级别并仅保留一些值。
https://jqplay.org/s/_RZNr_oYwE
Json文件与此类似:
[
{
"date":"2020-04-13",
"product1":{"p_max":18.00,"p_min":8.00,"interval":[{"time":"06:00:00","price":8.00},{"time":"12:00:00","price":18.00},{"time":"18:00:00","price":16.00},{"time":"24:00:00","price":9.00}]},
"product2":{"p_max":18.00,"p_min":8.00,"interval":[{"time":"06:00:00","price":8.00},{"time":"12:00:00","price":18.00},{"time":"18:00:00","price":16.00},{"time":"24:00:00","price":9.00}]}
},
{
"date":"2020-04-14",
"product1":{"p_max":18.00,"p_min":8.00,"interval":[{"time":"06:00:00","price":8.00},{"time":"12:00:00","price":18.00},{"time":"18:00:00","price":16.00},{"time":"24:00:00","price":9.00}]},
"product2":{"p_max":18.00,"p_min":8.00,"interval":[{"time":"06:00:00","price":9.00},{"time":"12:00:00","price":16.00},{"time":"18:00:00","price":15.00},{"time":"24:00:00","price":11.00}]}
},
{
"date":"2020-04-15",
"product1":{"p_max":16.00,"p_min":9.00,"interval":[]},
"product2":{"p_max":16.00,"p_min":9.00,"interval":[]}
}
]
我想出了如何转换json,但是我错过了一些值:
jq --compact-output '.[] | .product1.interval[] as $interval| {date: .date, time: ($interval.time//"N/A"), price: ($interval.price//-1)}'
这是输出:
{"date":"2020-04-13", "time":"06:00:00", "price":8}
{"date":"2020-04-13", "time":"12:00:00", "price":18}
{"date":"2020-04-13", "time":"18:00:00", "price":16}
{"date":"2020-04-13", "time":"24:00:00", "price":9}
{"date":"2020-04-14", "time":"06:00:00", "price":9}
{"date":"2020-04-14", "time":"12:00:00", "price":16}
{"date":"2020-04-14", "time":"18:00:00", "price":15}
{"date":"2020-04-14", "time":"24:00:00", "price":11}
但我很想念:
{"date":"2020-04-15", "time":"N/A", "price":-1}
我也曾经尝试过,但是不能,所以我想我必须在bash脚本中进行迭代才能获得以下输出:
{"date":"2020-04-13", "time":"06:00:00", "product": "product1", "price":8}
{"date":"2020-04-13", "time":"06:00:00", "product": "product2", "price":4}
{"date":"2020-04-13", "time":"12:00:00", "product": "product1", "price":18}
{"date":"2020-04-13", "time":"12:00:00", "product": "product2", "price":8]
{"date":"2020-04-13", "time":"18:00:00", "product": "product1", "price":16}
{"date":"2020-04-13", "time":"18:00:00", "product": "product2", "price":8}
{"date":"2020-04-13", "time":"24:00:00", "product": "product1", "price":9}
{"date":"2020-04-13", "time":"24:00:00", "product": "product2", "price":5}
{"date":"2020-04-14", "time":"06:00:00", "product": "product1", "price":9}
{"date":"2020-04-14", "time":"06:00:00", "product": "product2", "price":6}
{"date":"2020-04-14", "time":"12:00:00", "product": "product1", "price":16}
{"date":"2020-04-14", "time":"12:00:00", "product": "product2", "price":6}
{"date":"2020-04-14", "time":"18:00:00", "product": "product1", "price":15}
{"date":"2020-04-14", "time":"18:00:00", "product": "product2", "price":15}
{"date":"2020-04-14", "time":"24:00:00", "product": "product1", "price":11}
{"date":"2020-04-14", "time":"24:00:00", "product": "product2", "price":11}
{"date":"2020-04-15", "time":"N/A", "product": "product1", "price":-1}
{"date":"2020-04-15", "time":"N/A", "product": "product2", "price":-1}
有什么方法可以获取“空”值? 有什么方法可以用jq生成第二个输出,而无需在bash上进行迭代?
答案 0 :(得分:2)
不,您不需要在bash上迭代,JQ可以自己做到。
使用keys_unsorted
(必须删除date
)获取产品名称,并使用if-then-else
表达式将interval
和空白的[{"time": "N/A", "price": -1}]
交替使用。
.[]
| {date} + (
del(.date)
| keys_unsorted[] as $product
| {$product} + (
.[$product].interval
| if . == [] then
{time: "N/A", price: -1}
else
.[]
end
)
)