Rails Modeling Example

gistfile1.rb

# Models

# app/models/user.rb
class User < ActiveRecord::Base
  has_many :articles
  has_many :videos
  has_many :photos
end

# app/models/article.rb
class Article < ActiveRecord::Base
  include IsContent
  validates :text, presence: true
end

# app/models/photo.rb
class Photo < ActiveRecord::Base
  include IsContent
  include HasUrl
end

# app/models/video.rb
class Video < ActiveRecord::Base
  include IsContent
  include HasUrl
end


# Concerns

# app/models/concerns/is_content.rb
module IsContent
  extend ActiveSupport::Concern

  included do
    belongs_to :user
  end
end

# app/models/concerns/has_url.rb
module HasUrl
  extend ActiveSupport::Concern

  included do
    validates :url, presence: true
  end
end