activerecord - Rails includes with scope

Question

I have a model called Author. An author has many Articles. Articles have a scope called .published that does: where(published: true).

I want to load the author, with the published articles. I tried:

Author.includes(:articles.published).find(params[:author_id])

But that throws an error: undefined method 'published'. Any idea?

question from:https://stackoverflow.com/questions/26159533/rails-includes-with-scope

Answer 1

I think the best solution would be:

Author.includes(:articles).where(:articles=>{published: true}).find(params[:author_id])

Or you can create scope:

class Author < ActiveRecord::Base 
    scope :with_published_articles, -> { includes(:articles).where(articles: { published: true}) }
end

and then:

Author.with_published_articles.find(params[:author_id].to_s)