Add interpolation key with custom validate

[nicolas-besnard]

I'm using dry-validation for my models with ActiveRecord.

I'd like to know if there's a way to add a custom interpolation key to my validation.

For example:

schema = Dry::Validation.Schema do
  required(:time_table).value(type?: ModelClass)

  validate(previous_term_paid?: [:time_table]) do |time_table|
    if time_table.term > 1 && !time_table.previous.paid?
      false
    else
      true
    end
  end
end

schema.call(time_table: Model.find(...))

Is there a way to add time_table.previous.term to my error message ?

[siassaj]

+1
simplest form:

validate(previous_term_paid?: [:time_table]) do |time_table, context|
    if time_table.term > 1 && !time_table.previous.paid?
      context.keys[:term] = time_table.previous.term
      false
    else
      true
    end
  end

[flash-gordon]

This will be added during #440