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Script Argument Mapping

This example shows how Hera can automatically map the values in a with_items dictionary.

See how to do this dynamically in the JSON payload fanout example.

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from hera.workflows import Steps, Workflow, script


@script()
def test_key_mapping(key_1: str, key_2: str):
    print("{key_1}, {key_2}".format(key_1=key_1, key_2=key_2))


with Workflow(
    generate_name="script-argument-mapping-",
    entrypoint="steps",
) as w:
    with Steps(name="steps"):
        test_key_mapping(
            with_items=[
                {"key_1": "value:1-1", "key_2": "value:2-1"},
                {"key_1": "value:1-2", "key_2": "value:2-2"},
                {"key_1": "value:1-3", "key_2": "value:2-3"},
                {"key_1": "value:1-4", "key_2": "value:2-4"},
            ],
        )

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apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: script-argument-mapping-
spec:
  entrypoint: steps
  templates:
  - name: steps
    steps:
    - - name: test-key-mapping
        template: test-key-mapping
        withItems:
        - key_1: value:1-1
          key_2: value:2-1
        - key_1: value:1-2
          key_2: value:2-2
        - key_1: value:1-3
          key_2: value:2-3
        - key_1: value:1-4
          key_2: value:2-4
        arguments:
          parameters:
          - name: key_1
            value: '{{item.key_1}}'
          - name: key_2
            value: '{{item.key_2}}'
  - name: test-key-mapping
    inputs:
      parameters:
      - name: key_1
      - name: key_2
    script:
      image: python:3.10
      source: |-
        import os
        import sys
        sys.path.append(os.getcwd())
        import json
        try: key_1 = json.loads(r'''{{inputs.parameters.key_1}}''')
        except: key_1 = r'''{{inputs.parameters.key_1}}'''
        try: key_2 = json.loads(r'''{{inputs.parameters.key_2}}''')
        except: key_2 = r'''{{inputs.parameters.key_2}}'''

        print('{key_1}, {key_2}'.format(key_1=key_1, key_2=key_2))
      command:
      - python

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