foo.rb

foo.rb

#read_onlyコラムを追加

class Follow < ActiveRecord::Base
  before_update :validate_read_only
  before_create :set_read_only
  
  def set_read_only
    self.read_only = true
  end
  
  def validate_read_only
    if self.read_only
      return false
    end
  end
end