[英]how to extract and modify inner array objects with parent object data in jq
We are tying to format a json similar to this:我们正在尝试格式化 json,类似于:
[
{"id": 1,
"type": "A",
"changes": [
{"id": 12},
{"id": 13}
],
"wanted_key": "good",
"unwanted_key": "aaa"
},
{"id": 2,
"type": "A",
"unwanted_key": "aaa"
},
{"id": 3,
"type": "B",
"changes": [
{"id": 31},
{"id": 32}
],
"unwanted_key": "aaa",
"unwanted_key2": "aaa"
},
{"id": 4,
"type": "B",
"unwanted_key3": "aaa"
},
null,
null,
{"id": 7}
]
into something like this:变成这样的东西:
[
{
"id": 1,
"type": "A",
"wanted_key": true # every record must have this key/value
},
{
"id": 12, # note: this was in the "changes" property of record id 1
"type": "A", # type should be the same type than record id 1
"wanted_key": true
},
{
"id": 13, # note: this was in the "changes" property of record id 1
"type": "A", # type should be the same type than record id 1
"wanted_key": true
},
{
"id": 2,
"type": "A",
"wanted_key": true
},
{
"id": 3,
"type": "B",
"wanted_key": true
},
{
"id": 31, # note: this was in the "changes" property of record id 3
"type": "B", # type should be the same type than record id 3
"wanted_key": true
},
{
"id": 32, # note: this was in the "changes" property of record id 3
"type": "B", # type should be the same type than record id 3
"wanted_key": true
},
{
"id": 4,
"type": "B",
"wanted_key": true
},
{
"id": 7,
"type": "UNKN", # records without a type should have this type
"wanted_key": true
}
]
So far, I've been able to:到目前为止,我已经能够:
What we are missing:我们缺少什么:
changes
key, create new records with the type
of their parent recordchanges
键的记录中,创建具有其父记录type
的新记录Unfortunately we are not entirely sure how to proceed... Any help would be appreciated.不幸的是,我们不完全确定如何进行......任何帮助将不胜感激。
So far our jq goes like this: del(..|nulls) | map({id, type: (.type // "UNKN"), wanted_key: (true)}) | del(..|nulls)
到目前为止,我们的 jq 是这样的:
del(..|nulls) | map({id, type: (.type // "UNKN"), wanted_key: (true)}) | del(..|nulls)
del(..|nulls) | map({id, type: (.type // "UNKN"), wanted_key: (true)}) | del(..|nulls)
Here's our test code:这是我们的测试代码:
https://jqplay.org/s/eLAWwP1ha8P https://jqplay.org/s/eLAWwP1ha8P
The following should work:以下应该有效:
map(select(values))
| map(., .type as $type | (.changes[]? + {$type}))
| map({id, type: (.type // "UNKN"), wanted_key: true})
Multiple map
calls can usually be combined, so this becomes:多个
map
调用通常可以组合起来,因此变为:
map(
select(values)
| ., (.type as $type | (.changes[]? + {$type}))
| {id, type: (.type // "UNKN"), wanted_key: true}
)
Another option without variables:没有变量的另一个选项:
map(
select(values)
| ., .changes[]? + {type}
| {id, type: (.type // "UNKN"), wanted_key: true}
)
# or:
map(select(values))
| map(., .changes[]? + {type})
| map({id, type: (.type // "UNKN"), wanted_key: true})
or even with a separate normalization step for the unknown type:甚至对未知类型有一个单独的标准化步骤:
map(select(values))
| map(.type //= "UNKN")
| map(., .changes[]? + {type})
| map({id, type, wanted_key: true})
# condensed to a single line:
map(select(values) | .type //= "UNKN" | ., .changes[]? + {type} | {id, type, wanted_key: true})
Explanation:解释:
"UNKN"
"UNKN"
的属性Here's one way:这是一种方法:
map(
select(values)
| (.type // "UNKN") as $type
| ., .changes[]?
| {id, $type, wanted_key: true}
)
[
{
"id": 1,
"type": "A",
"wanted_key": true
},
{
"id": 12,
"type": "A",
"wanted_key": true
},
{
"id": 13,
"type": "A",
"wanted_key": true
},
{
"id": 2,
"type": "A",
"wanted_key": true
},
{
"id": 3,
"type": "B",
"wanted_key": true
},
{
"id": 31,
"type": "B",
"wanted_key": true
},
{
"id": 32,
"type": "B",
"wanted_key": true
},
{
"id": 4,
"type": "B",
"wanted_key": true
},
{
"id": 7,
"type": "UNKN",
"wanted_key": true
}
]
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