How-to: Validate Array Cardinality (JSON Schema)

Require items array length between 1 and 3.

1. Define the input

inputs:
  items:
    type: string[]

2. Add JSON Schema hint

hints:
  - class: eoap:JSONSchemaHint
    json_schema:
      type: object
      required: [items]
      properties:
        items:
          type: array
          minItems: 1
          maxItems: 3
          items:
            type: string

3. Validate with sample values

Valid:

items: ["a", "b"]

Run:

assertions-mate workflow.cwl --inputs inputs-valid.yaml

Ready-to-run example in this repository

• examples/array-cardinality-validation/workflow.cwl
• examples/array-cardinality-validation/inputs-valid.yaml
• examples/array-cardinality-validation/inputs-invalid.yaml