Rails, how add to method html/js?

For example, I have a lot of similar pages. With only one difference: on each of this page (they have different controller) they have different variable, what apply to this html.erb file.

For example, video post html.erb

<% for post in @posts_for_video>
  here some html
  and javascript
  and also ruby code injection
<% end %>

Video controller:

@posts_for_video = Post.where(photo: true)

And my photos page:

<% for post in @post_for_photos >
  same html as video
  same js as video
  and same ruby code as video
<% end %>

Photo controller:

@posts_for_photo = Post.where(video: photo)

So my question: Is there any possibility to put html+js+ruby_code to, for example application_controller.rb?

I think, what I'm looking for is (in application_controller.rb):

def posts_for_all(post_variable)
  for post in post_variable
    html: post.theme
    js: post.animation
    ruby: some methods
  end
end