Json JQ选择存在内部键的对象

仅当密钥

credhub ref

存在于以下JSON中时，我才尝试选择凭证对象：

{
   "total_results": 23,
   "total_pages": 1,
   "prev_url": null,
   "next_url": null,
   "resources": [
      {
         "entity": {
            "credentials": {},
            "binding_options": {},
            "gateway_data": null,
            "gateway_name": "",
            "syslog_drain_url": null,
            "volume_mounts": [],
            "name": null,
            "last_operation": {
               "type": "create",
               "state": "succeeded",
               "description": "",
               "updated_at": "2018-10-15T19:13:57Z",
               "created_at": "2018-10-15T19:13:57Z"
            },
            "app_url": "/v2/3"
         }
      },
      {
         "entity": {
            "app_guid": "sd",
            "service_instance_guid": "sd",
            "credentials": {
               "hostname": "w",
               "port": 3306
            },
            "binding_options": {},
            "gateway_data": null,
            "gateway_name": "",
            "syslog_drain_url": null,
            "volume_mounts": [],
            "name": null,
            "last_operation": {
               "type": "create",
               "state": "succeeded",
               "description": "",
               "updated_at": "2018-10-15T19:24:06Z",
               "created_at": "2018-10-15T19:24:06Z"
            },
            "app_url": "/v2/3"
         }
      },
      {
         "entity": {
            "credentials": {
               "credhub-ref": "ref3"
            },
            "binding_options": {},
            "gateway_data": null,
            "gateway_name": "",
            "syslog_drain_url": null,
            "volume_mounts": [],
            "name": null,
            "last_operation": {
               "type": "create",
               "state": "succeeded",
               "description": "",
               "updated_at": "2019-03-19T20:07:27Z",
               "created_at": "2019-03-19T20:07:27Z"
            },
            "app_url": "/v2/45"
         }
      },
      {
         "entity": {
            "credentials": {
               "credhub-ref": "ref4"
            },
            "binding_options": {},
            "gateway_data": null,
            "gateway_name": "",
            "syslog_drain_url": null,
            "volume_mounts": [],
            "name": null,
            "last_operation": {
               "type": "create",
               "state": "succeeded",
               "description": "",
               "updated_at": "2019-03-19T20:07:27Z",
               "created_at": "2019-03-19T20:07:27Z"
            },
            "app_url": "/v2/45"
         }
      }
   ]
}

当我使用

cat my_bindings_test2.json | jq'.resources[]|.entity.credentials'

时，我得到：

{}
{
  "hostname": "w",
  "port": 3306
}
{
  "credhub-ref": "ref3"
}
{
  "credhub-ref": "ref4"
}

使用JQ，我将如何得到以下结果

{
  "credhub-ref": "ref3"
}
{
  "credhub-ref": "ref4"
}

像这样：

jq '.resources[].entity.credentials|select(has("credhub-ref"))' file.json

---

如果保证

credhub ref

不会为

null

或

false

，则可以使用

select（.[credhub ref]]）

：

---

否则请参考@hek2mgl的答案。

谢谢。刚到jq的我今天好几次都很亲近。我使用的是

jq'.resources[].entity.credentials | select（.credhub ref）'my_bindings_test.json

Welcome。当keyname包含不明确的字符时，可以使用

[“keyname”]

符号说明：如果“credhub ref”为

null

或

false

，则不会产生输出。不确定这是否是你想要的。这个问题的正确答案是使用

has（“credhub-ref”）

——正如我所展示的；）NP做得好！PS:

null

和

false

似乎是jq中唯一的“falsish”值-与javascript相反。这是个好消息！我从来都不确定，谢谢。这个值永远不应该为false或null，但我很高兴您提到了这一点，因为我打算将其推广以备将来使用。

jq '.resources[].entity.credentials | select(.["credhub-ref"])' file