6. Pre-fill a field from the current user

Most users operate on one default workflow. You want the schema's default for workflow_id to be that user's default, not a hardcoded constant.

Problem. Most users operate on one default workflow. You want the schema's default for workflow_id to be that user's default, not a hardcoded constant.

Solution. Tag with @default_for(:key) and implement default_for on your user.

#: (
#:   applicant_id: String,
#:   workflow_id: String   @default_for(:workflow_id)
#: ) -> Hash[Symbol, untyped]

class CurrentUser
  def default_for(key)
    case key
    when :workflow_id then defaults[:workflow_id]
    end
  end
end

Result. A manager's schema shows "default": "wf-executive-hiring"; an operator's shows "default": "wf-standard-hiring". Same param, personalized default, resolved per request. default_for is optional — skip the tag and you never need the method.

Want a static default instead? Use @default(value) — it takes literals: true, false, nil, numbers, or strings.

Collected from COOKBOOK.md in the repository. Edit it there, not here.