Is there a Railsy way of doing this kind of thing?

1-schema.rb

create_table "photos" do |t|
  t.string   "image_url"
  t.integer  "post_id"
end

create_table "posts" do |t|
  t.string   "title"
  t.text     "content"
end

create_table "videos" do |t|
  t.string   "video_url"
  t.integer  "post_id"
end

2-photo.rb

class Photo < ActiveRecord::Base
  belongs_to :post
end

2-post.rb

class Post < ActiveRecord::Base
  has_one :video
  has_one :photo
end

2-video.rb

class Video < ActiveRecord::Base
  belongs_to :post
end

3-console.rb

Post.create!(title: "Test", content: "Lorem ipsum")
Photo.create!(image_url: "http://example.com/me.jpg", post_id: 1)

post = Post.first
post.title # => Test
post.content # => Lorem ipsum
post.photo.image_url # => http://example.com/me.jpg

4-goal.md

I'd like to be able to call image_url, video_url, and other post-type specific attributes directly on post. For example:

post.title # => Test title
post.image_url # => http://example.com/me.jpg

Is there a Railsy way of doing this?

Yes:

class Post < ActiveRecord::Base
  delegate :image_url, to: :photo
  delegate :video_url, to: :video
end

What @searls said

Thanks, @searls! That worked. I had to keep the has_one lines though.

class Post < ActiveRecord::Base
  has_one :video
  has_one :photo

  delegate :image_url, to: :photo
  delegate :video_url, to: :video
end