Resource Orchestration Service:Fn::SelectMapList

Declaration

• JSON

  {
    "Fn::SelectMapList": [
      "key2",
      [
        {
          "key1": "value1-1",
        	"key3": "value1-3"
        },
        {
          "key1": "value2-1",
        	"key2": "value2-2"
        },
        {
          "key1": "value3-1",
        	"key2": "value3-2"
        }
      ]
    ]
  }

• YAML

  • Syntax for the full function name:

    Fn::SelectMapList:
      - key2
      - - key1: value1-1
          key3: value1-3
        - key1: value2-1
          key2: value2-2
        - key1: value3-1
          key2: value3-2
        - ...

  • Syntax for the short form:

    !SelectMapList
    	- key2
      - - key1: value1-1
          key3: value1-3
        - key1: value2-1
          key2: value2-2
        - key1: value3-1
          key2: value3-2
        - ...

Parameters

• key2: the key that you want to use to query values from a list of maps.

• key1: value1-1, key3: value1-3, ...: the list of maps from which you want to query values.

Return value

The values that consist of the value queried from each map in the list by using the key.

Examples

!SelectMapList
  - key2
  - - key1: value1-1
      key3: value1-3
    - key1: value2-1
      key2: value2-2
    - key1: value3-1
      key2: value3-2

In this example, [value2-2, value3-2] is returned.