Issue passing List of Objects from script

Checklist:

[x] I've included the version.
[x] I've included reproduction steps.
[x] I've included the workflow YAML.
[x] I've included the logs.

What happened: Issue passing List of Objects from script result into step using "withParam"

What you expected to happen: To reference properties from object in list

How to reproduce it (as minimally and precisely as possible): Run a workflow that gives you a complex list of objects from a script For example "payment_breakdown": [1,2,3] was the part causing issues

Anything else we need to know?: First raised on slack: https://argoproj.slack.com/archives/C8J6SGN12/p1586532311445800

Environment: argo: v2.7.1

Kubernetes version : Server: v1.15.9-gke.24

Other debugging information (if applicable):

workflow result:


Name:                competitions-sync-mlw7h
Namespace:           default
ServiceAccount:      default
Status:              Failed
Message:             json: error calling MarshalJSON for type v1alpha1.ItemValue: impossible ItemValue.Type
Created:             Sat Apr 11 01:25:46 +1000 (30 minutes ago)
Started:             Sat Apr 11 01:25:46 +1000 (30 minutes ago)
Finished:            Sat Apr 11 01:25:54 +1000 (30 minutes ago)
Duration:            8 seconds

STEP TEMPLATE PODNAME DURATION MESSAGE ✖ competitions-sync-mlw7h competitions-sync json: error calling MarshalJSON for type v1alpha1.ItemValue: impossible ItemValue.Type ├---✔ generate load-comps competitions-sync-mlw7h-3145653320 6s


- actual workflow

apiVersion: argoproj.io/v1alpha1 kind: Workflow metadata: generateName: competitions-sync- spec: entrypoint: competitions-sync templates:

name: competitions-sync steps:
- - name: generate template: load-comps
- - name: say template: print-message arguments: parameters:
    - name: message value: "{{item.owner_id}}" withParam: "{{steps.generate.outputs.result}}"
name: load-comps script: image: gcr.io/nordic-gaming/contextgg/hub:latest command: [sh] env:
- name: CONTEXTGG_ENV value: prod source: | hub competitions running
name: print-message inputs: parameters:
- name: message container: image: docker/whalesay:latest command: [cowsay] args: ["{{inputs.parameters.message}}"]
```
- output from generate step
```

[{"id":"8958929a-772d-11ea-80c7-f24469382481","state":0,"created_by":"6dde4052-5614-5d4d-ab22-facf8acdf6e5","owner_id":"6dde4052-5614-5d4d-ab22-facf8acdf6e5","type":"smashgg","tournament_text":null,"tournament_type":"","tournament_id":209601,"event_id":471337,"season_id":null,"region_id":"","rank_id":"","max_teams":2,"payment_type":"percentage","payment_breakdown":[75,25],"amount":500,"currency":"USD","locked":false,"contributors":null},{"id":"986b96b9-7985-11ea-9fae-128030a29656","state":0,"created_by":"55e1ff11-7001-5018-875e-5e81ce9d02d3","owner_id":"55e1ff11-7001-5018-875e-5e81ce9d02d3","type":"sixmans","tournament_text":null,"tournament_type":"","tournament_id":null,"event_id":null,"season_id":31,"region_id":"OCE","rank_id":"X","max_teams":3,"payment_type":"percentage","payment_breakdown":[60,25,15],"amount":0,"currency":"AUD","locked":false,"contributors":null},{"id":"f972d8d7-799b-11ea-b570-86bdb62ad2fc","state":0,"created_by":"55e1ff11-7001-5018-875e-5e81ce9d02d3","owner_id":"55e1ff11-7001-5018-875e-5e81ce9d02d3","type":"sixmans","tournament_text":null,"tournament_type":"","tournament_id":null,"event_id":null,"season_id":31,"region_id":"NA","rank_id":"X","max_teams":3,"payment_type":"percentage","payment_breakdown":[60,25,15],"amount":0,"currency":"USD","locked":false,"contributors":null},{"id":"151c1d12-799c-11ea-b570-86bdb62ad2fc","state":0,"created_by":"1750fd55-0507-5441-a3bc-79bfe5efac1a","owner_id":"1750fd55-0507-5441-a3bc-79bfe5efac1a","type":"sixmans","tournament_text":null,"tournament_type":"","tournament_id":null,"event_id":null,"season_id":31,"region_id":"OCE","rank_id":"S","max_teams":3,"payment_type":"percentage","payment_breakdown":[60,25,15],"amount":0,"currency":"AUD","locked":false,"contributors":null},{"id":"34c0c141-799c-11ea-b570-86bdb62ad2fc","state":0,"created_by":"55e1ff11-7001-5018-875e-5e81ce9d02d3","owner_id":"55e1ff11-7001-5018-875e-5e81ce9d02d3","type":"sixmans","tournament_text":null,"tournament_type":"","tournament_id":null,"event_id":null,"season_id":31,"region_id":"EU","rank_id":"X","max_teams":3,"payment_type":"percentage","payment_breakdown":[60,25,15],"amount":0,"currency":"EUR","locked":false,"contributors":null},{"id":"de92ef77-799e-11ea-b570-86bdb62ad2fc","state":0,"created_by":"1750fd55-0507-5441-a3bc-79bfe5efac1a","owner_id":"1750fd55-0507-5441-a3bc-79bfe5efac1a","type":"sixmans","tournament_text":null,"tournament_type":"","tournament_id":null,"event_id":null,"season_id":31,"region_id":"NA","rank_id":"S","max_teams":3,"payment_type":"percentage","payment_breakdown":[60,25,15],"amount":0,"currency":"USD","locked":false,"contributors":null},{"id":"f7e7f59f-799e-11ea-b570-86bdb62ad2fc","state":0,"created_by":"1750fd55-0507-5441-a3bc-79bfe5efac1a","owner_id":"1750fd55-0507-5441-a3bc-79bfe5efac1a","type":"sixmans","tournament_text":null,"tournament_type":"","tournament_id":null,"event_id":null,"season_id":31,"region_id":"EU","rank_id":"S","max_teams":3,"payment_type":"percentage","payment_breakdown":[60,25,15],"amount":0,"currency":"EUR","locked":false,"contributors":null},{"id":"3102c54a-7a98-11ea-96da-6e380b72ac98","state":0,"created_by":"f14b0f7e-260a-5caf-8e65-c1d25179302a","owner_id":"f14b0f7e-260a-5caf-8e65-c1d25179302a","type":"smashgg","tournament_text":null,"tournament_type":"","tournament_id":210650,"event_id":472702,"season_id":null,"region_id":"","rank_id":"","max_teams":1,"payment_type":"percentage","payment_breakdown":[100],"amount":0,"currency":"USD","locked":false,"contributors":null}]

Message from the maintainers:

If you are impacted by this bug please add a 👍 reaction to this issue! We often sort issues this way to know what to prioritize.

Correcter YAML to repro:

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  name: competitions-sync
spec:
  entrypoint: competitions-sync
  templates:
    - name: competitions-sync
      steps:
        - - name: generate
            template: load-comps

        - - name: say
            template: print-message
            arguments:
              parameters:
                - name: message
                  value: "{{item.owner_id}}"
            withParam: "{{steps.generate.outputs.result}}"

    - name: load-comps
      script:
        image: docker/whalesay:latest
        command: [sh]
        env:
          - name: CONTEXTGG_ENV
            value: prod
        source: |
          echo '[{"id":"8958929a-772d-11ea-80c7-f24469382481","state":0,"created_by":"6dde4052-5614-5d4d-ab22-facf8acdf6e5","owner_id":"6dde4052-5614-5d4d-ab22-facf8acdf6e5","type":"smashgg","tournament_text":null,"tournament_type":"","tournament_id":209601,"event_id":471337,"season_id":null,"region_id":"","rank_id":"","max_teams":2,"payment_type":"percentage","payment_breakdown":[75,25],"amount":500,"currency":"USD","locked":false,"contributors":null},{"id":"986b96b9-7985-11ea-9fae-128030a29656","state":0,"created_by":"55e1ff11-7001-5018-875e-5e81ce9d02d3","owner_id":"55e1ff11-7001-5018-875e-5e81ce9d02d3","type":"sixmans","tournament_text":null,"tournament_type":"","tournament_id":null,"event_id":null,"season_id":31,"region_id":"OCE","rank_id":"X","max_teams":3,"payment_type":"percentage","payment_breakdown":[60,25,15],"amount":0,"currency":"AUD","locked":false,"contributors":null},{"id":"f972d8d7-799b-11ea-b570-86bdb62ad2fc","state":0,"created_by":"55e1ff11-7001-5018-875e-5e81ce9d02d3","owner_id":"55e1ff11-7001-5018-875e-5e81ce9d02d3","type":"sixmans","tournament_text":null,"tournament_type":"","tournament_id":null,"event_id":null,"season_id":31,"region_id":"NA","rank_id":"X","max_teams":3,"payment_type":"percentage","payment_breakdown":[60,25,15],"amount":0,"currency":"USD","locked":false,"contributors":null},{"id":"151c1d12-799c-11ea-b570-86bdb62ad2fc","state":0,"created_by":"1750fd55-0507-5441-a3bc-79bfe5efac1a","owner_id":"1750fd55-0507-5441-a3bc-79bfe5efac1a","type":"sixmans","tournament_text":null,"tournament_type":"","tournament_id":null,"event_id":null,"season_id":31,"region_id":"OCE","rank_id":"S","max_teams":3,"payment_type":"percentage","payment_breakdown":[60,25,15],"amount":0,"currency":"AUD","locked":false,"contributors":null},{"id":"34c0c141-799c-11ea-b570-86bdb62ad2fc","state":0,"created_by":"55e1ff11-7001-5018-875e-5e81ce9d02d3","owner_id":"55e1ff11-7001-5018-875e-5e81ce9d02d3","type":"sixmans","tournament_text":null,"tournament_type":"","tournament_id":null,"event_id":null,"season_id":31,"region_id":"EU","rank_id":"X","max_teams":3,"payment_type":"percentage","payment_breakdown":[60,25,15],"amount":0,"currency":"EUR","locked":false,"contributors":null},{"id":"de92ef77-799e-11ea-b570-86bdb62ad2fc","state":0,"created_by":"1750fd55-0507-5441-a3bc-79bfe5efac1a","owner_id":"1750fd55-0507-5441-a3bc-79bfe5efac1a","type":"sixmans","tournament_text":null,"tournament_type":"","tournament_id":null,"event_id":null,"season_id":31,"region_id":"NA","rank_id":"S","max_teams":3,"payment_type":"percentage","payment_breakdown":[60,25,15],"amount":0,"currency":"USD","locked":false,"contributors":null},{"id":"f7e7f59f-799e-11ea-b570-86bdb62ad2fc","state":0,"created_by":"1750fd55-0507-5441-a3bc-79bfe5efac1a","owner_id":"1750fd55-0507-5441-a3bc-79bfe5efac1a","type":"sixmans","tournament_text":null,"tournament_type":"","tournament_id":null,"event_id":null,"season_id":31,"region_id":"EU","rank_id":"S","max_teams":3,"payment_type":"percentage","payment_breakdown":[60,25,15],"amount":0,"currency":"EUR","locked":false,"contributors":null},{"id":"3102c54a-7a98-11ea-96da-6e380b72ac98","state":0,"created_by":"f14b0f7e-260a-5caf-8e65-c1d25179302a","owner_id":"f14b0f7e-260a-5caf-8e65-c1d25179302a","type":"smashgg","tournament_text":null,"tournament_type":"","tournament_id":210650,"event_id":472702,"season_id":null,"region_id":"","rank_id":"","max_teams":1,"payment_type":"percentage","payment_breakdown":[100],"amount":0,"currency":"USD","locked":false,"contributors":null}]'

    - name: print-message
      inputs:
        parameters:
          - name: message
      container:
        image: docker/whalesay:latest
        command: [cowsay]
        args: ["{{inputs.parameters.message}}"]

argoproj / argo-workflows

Issue passing List of Objects from script #2660