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 used to extract values from each map in the list.

• key1: value1-1, key3: value1-3, ...: the list of maps from which values are extracted.

Return value

A list of values, each extracted from the corresponding map by using the specified 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.