Rails sorting associations with Ransack

Question

first time poster. I am trying to sort a table of users using the Ransack gem and Kaminari for pagination. When I use name, id, etc. sorting works but when I try an associat

Answer 1

You can add a scope to your User model:

def self.with_posts
  joins(:posts).group('posts.id').select('users.*, count(posts.id) as posts_count')
end

and use it like this:

@search = User.with_posts.search(params[:q]) # Ransack

then, you can treat posts_count like any other attribute.

Answer 2

I found a solution:

Controller:

def index
    sql = "users.*, (select count(posts.id) from posts\
    where posts.user_id = users.id) as count"
    @search = User.select(sql).search(params[:q])

    if params[:q] && params[:q][:s].include?('count')
      @users = @search.result.order(params[:q][:s])
    else
      @users = @search.result
    end
    .......
end

View:

<th><%= sort_link @search, :count, "posts count" %></th>