How to prevent N+1 queries when using polymorphic associations in Rails 7?
I'm relatively new to this, so bear with me. Does anyone know how to I'm working on a personal project and I tried several approaches but none seem to work... I'm working with an scenario with N+1 queries when retrieving data from a polymorphic association in my Rails 7 application. I have a `Comment` model that can belong to either a `Post` or a `Photo`, set up as follows: ```ruby class Comment < ApplicationRecord belongs_to :commentable, polymorphic: true end class Post < ApplicationRecord has_many :comments, as: :commentable end class Photo < ApplicationRecord has_many :comments, as: :commentable end ``` In my controller, I'm trying to retrieve a collection of posts along with their comments, like this: ```ruby @posts = Post.includes(:comments).all ``` However, I noticed that when I access the comments for each post in the view, it's still triggering additional queries for the comments associated with each post. The SQL log shows multiple SELECT statements being executed, which is what I want to avoid. In my view, I am iterating through posts and their comments like so: ```erb <% @posts.each do |post| %> <h2><%= post.title %></h2> <p><%= post.body %></p> <h3>Comments:</h3> <ul> <% post.comments.each do |comment| %> <li><%= comment.body %></li> <% end %> </ul> <% end %> ``` I also tried using `joins` instead of `includes`, but that doesn't work since I need to load the comments fully. I even checked if the comments are being loaded by inspecting the logs, and they are indeed being fetched individually for each post. How can I optimize this to avoid the N+1 query question while still using polymorphic associations? Any suggestions for a more efficient way to load the comments in this scenario? My development environment is Windows. Has anyone else encountered this? Thanks in advance! Is this even possible? I'm on Linux using the latest version of Ruby. Any pointers in the right direction?