JQ 选择值包含字符串且值不为空的对象

Question

尝试从 JSON 数组中选择对象，其中值包含字符串且值不为空。

期望的输出：

    {
      "configurable": false,
      "property_reference": ".properties.blobstore_certificate",
      "property_type": "rsa_cert_credentials",
      "product_guid": "p-blah-29d4678e926cf2069871",
      "location": "ops_manager",
      "variable_path": "something",
      "issuer": "/C=US/O=Blah",
      "valid_from": "2019-01-16T19:55:11Z",
      "valid_until": "2021-01-16T19:55:11Z"
    }

选择时：

{
  "certificates": [
    {
      "configurable": false,
      "property_reference": ".properties.director_ssl",
      "property_type": "rsa_cert_credentials",
      "product_guid": "p-blah-29d4678e926cf2069871",
      "location": "ops_manager",
      "variable_path": null,
      "issuer": "/C=US/O=Blah",
      "valid_from": "2019-01-16T19:55:10Z",
      "valid_until": "2021-01-16T19:55:10Z"
    },
    {
      "configurable": false,
      "property_reference": ".properties.uaa_ssl",
      "property_type": "rsa_cert_credentials",
      "product_guid": "p-blah-29d4678e926cf2069871",
      "location": "ops_manager",
      "variable_path": null,
      "issuer": "/C=US/O=Blah",
      "valid_from": "2019-01-16T19:55:10Z",
      "valid_until": "2021-01-16T19:55:10Z"
    },
    {
      "configurable": false,
      "property_reference": ".properties.blobstore_certificate",
      "property_type": "rsa_cert_credentials",
      "product_guid": "p-blah-29d4678e926cf2069871",
      "location": "ops_manager",
      "variable_path": "something",
      "issuer": "/C=US/O=Blah",
      "valid_from": "2019-01-16T19:55:11Z",
      "valid_until": "2021-01-16T19:55:11Z"
    }
  ]
}

使用：

curl blah | jq ' .certificates[] | select(.variable_path|test("thing"))'

获得：

jq: error (at <stdin>:0): null (null) cannot be matched, as it is not a string

我认为问题在于存在空值。我不确定如何在不出现错误的情况下选择这些空值。

Answer 1

null从考虑中删除这些值的一种方法是：

.certificates[] | select(.variable_path | strings | test("thing"))

您也可以考虑使用?，可以像这样在这里使用：

.certificates[] | select(.variable_path | test("thing")?)