使用jq更新对象中其他字段标识的数组元素

Question

目标

我想在kubeconfig文件的当前活动clusters条目中添加一个proxy-url字段。"；活动的"；簇由"；活动的"；上下文，其本身由顶级密钥current-context标识。简化后，JSON对象看起来像：

{
"clusters":[
{
"name":"cluster1",
"field":"field1"
},
{
"name":"cluster2",
"field":"field2"
}
],
"contexts":[
{
"name":"context1",
"context": {
"cluster":"cluster1"
}
},
{
"name":"context2",
"context": {
"cluster":"cluster2"
}
}
],
"current-context": "context1"
}

我想从更新cluster1的clusters条目

{
"name":"cluster1",
"field":"field1"
}

至

{
"name":"cluster1",
"field":"field1",
"proxy-url":"my-url"
}

第一次尝试

jq '. as $o
| $o."current-context" as $current_context_name
| $o.contexts[] | select(.name == $current_context_name) as $context
| $o.clusters[] | select(.name == $context.context.cluster)
| .proxy_id |= "my-url"'

给我

{
"name": "cluster1",
"field": "field1",
"proxy_id": "my-url"
}

--太棒了！但我也需要剩下的东西。

括号几乎起作用

使用圆括号，我可以取回整个对象&添加一个"；代理url"；字段添加到活动上下文，但我无法更进一步地更新活动cluster。此过滤器：

jq '(. as $o
| $o."current-context" as $current_context_name
| $o.contexts[] | select(.name == $current_context_name)
| ."proxy-url")
|= "my-url"'

铸币厂：

{
"clusters": [...],  // omitted for brevity, unchanged
"contexts": [
{
"name": "context1",
"context": {
"cluster": "cluster1"
},
"proxy-url": "my-url"  // tada!
},
{...}  // omitted for brevity, unchanged
],
"current-context": "context1"
}

尝试更进一步(更新由context标识的cluster(：

jq '(. as $o
| $o."current-context" as $current_context_name
| $o.contexts[] | select(.name == $current_context_name) as $context
| $o.clusters[] | select(.name == $context.context.cluster)
| ."proxy-url")
|= "my-url"'

给我以下错误：

jq: error (at <stdin>:26): Invalid path expression near attempt to access element "clusters" of {"clusters":[{"name":"clus...
exit status 5

如何使用$context.context.cluster结果来更新相关的clusters条目？我不明白为什么这种方法适用于向contexts添加某些内容，而不适用于clusters。

脏溶液

我可以拼凑出一个新的CCD_ 12条目&将其与顶级对象合并：

jq '. as $o
| $o."current-context" as $current_context_name
| $o.contexts[] | select(.name == $current_context_name) as $context
| $o + {"clusters": [($o.clusters[] | select(.name == $context.context.cluster)."proxy-url" |= "my-url")]}

但这感觉有点脆弱。

Answer 1

此解决方案使用INDEX构造检索活动集群，然后直接设置新字段，而不修改上下文：

jq '
INDEX(.contexts[]; .name)[."current-context"].context.cluster as $cluster
| (.clusters[] | select(.name == $cluster))."proxy-url" = "my-url"
'

{
"clusters": [
{
"name": "cluster1",
"field": "field1",
"proxy-url": "my-url"
},
{
"name": "cluster2",
"field": "field2"
}
],
"contexts": [
{
"name": "context1",
"context": {
"cluster": "cluster1"
}
},
{
"name": "context2",
"context": {
"cluster": "cluster2"
}
}
],
"current-context": "context1"
}

演示