Comment length validation options

with_block.rb

class Comment < ActiveRecord::Base
  
  validate do
    validator = ActiveModel::Validations::LengthValidator.new(
      attributes: :body,
      minimum: 10,
      maximum: Comment.body_max_length)
    validator.validate(self)
  end

  def self.body_max_length
    1000
  end

end
  

with_private_method.rb

class Comment < ActiveRecord::Base
  
  validate :validate_body_length

  def self.body_max_length
    1000
  end

  private

    def validate_body_length
      validator = ActiveModel::Validations::LengthValidator.new(
        attributes: :body,
        minimum: 10,
        maximum: Comment.body_max_length)
      validator.validate(self)
    end

end