has_many :through query with both values

Question

Let's say I have:

class Post
  has_many :tags, :through => :taggings
  has_many :taggings
end

Notice there's no :include. Now say I want to retrieve all taggings and tags in the same query. How could I do that?

I'm looking for something like:

taggings = post.taggings(:include => tags) # doesn't work

I could make a custom query or add a third association to Post with an :include, but neither feels right.

Answer 1

I think you can use includes on the association proxy as you would with the model class:

taggings = post.taggings.includes(:tag)