forgeplus/app/forms/projects/datasets/create_form.rb

class Projects::Datasets::CreateForm < BaseForm
  attr_accessor :title, :description, :license_id, :paper_content
  

  validates :title, presence: true, length: { maximum: 100 }
  validates :description, presence: true, length: { maximum: 500 }
  validates :paper_content, length: { maximum: 500 }

  validate :check_license

  def check_license
    raise "license_id值无效. " if license_id && License.find_by(id: license_id).blank?
  end

end