Require answer for multiselect

[roaldarbol]

Hi! Have only used copier for a short while, so am still learning the ropes.
Is there a way to require at least one selection when using multiselect?

[sisp]

You can define a validator:

toppings:
  type: str
  help: Select pizza toppings
  multiselect: true
  choices:
    - tomato
    - cheese
    - salami
  default: [tomato]
  validator: >
    {%- if toppings | length < 1 -%}
    You must select at least one topping
    {%- endif -%}

[roaldarbol]

Thanks, that's exactly what I was looking for!