runemadsen

Polymorphic Associations reversed

It's pretty easy to do polymorphic associations in Rails: A Picture can belong to either a BlogPost or an Article. But what if you need the relationship the other way around? A Picture, a Text and a Video can belong to an Article, and that article can find all media by calling @article.media

This example shows how to create an ArticleElement join model that handles the polymorphic relationship. To add fields that are common to all polymorphic models, add fields to the join model.

lucasfais

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jnunemaker

# include this in application controller
module Authentication
  protected
    # Inclusion hook to make #current_user and #signed_in?
    # available as ActionView helper methods.
    def self.included(base)
      base.send :helper_method, :current_user, :signed_in?, :authorized? if base.respond_to? :helper_method
    end
    
    # Returns true or false if the user is signed in.