Rails Service Design Patterns - Form Object - BaseForm

base_form.rb

class BaseForm
  include ActiveModel::Model

  def persisted?
    false
  end

  def save
    return false unless valid?

    persist!
    true
  rescue ActiveRecord::RecordInvalid
    raise ActiveRecord::RecordInvalid, self
  end

  def save!
    return true if save

    raise ActiveRecord::RecordInvalid, self
  end

  private

  def persist!; end

  def delegate_validation_on(object, delegate_field, field = nil)
    field ||= delegate_field

    error = object.errors[delegate_field].first

    errors.add(field, error) if error && !errors.added?(field, error)
  end
end