ActiveRecord Query Optimization in Rails 7.1 Causing Unexpected N+1 Queries
I need help solving I'm maintaining legacy code that I've searched everywhere and can't find a clear answer... Quick question that's been bugging me - I recently upgraded my Rails application to version 7.1, and I've noticed a significant performance hit due to unexpected N+1 queries when fetching associated records. In my `Post` model, I have a `has_many` relationship with `Comment`, and I'm trying to fetch posts along with their comments. However, when I run the following query: ```ruby @posts = Post.includes(:comments).where(published: true) ``` I expected this to preload comments and avoid N+1 queries. However, in my logs, I still see individual queries being executed for each comment: ``` SELECT "comments".* FROM "comments" WHERE "comments"."post_id" = $1 ``` I've tried using the `eager_load` method instead of `includes`, but that doesn't seem to resolve the issue either. Additionally, I've checked if any scopes or default scopes are inadvertently affecting my query, but everything appears to be set up correctly. I've also validated the associations in both models: ```ruby class Post < ApplicationRecord has_many :comments end class Comment < ApplicationRecord belongs_to :post end ``` When I run `@posts.to_sql`, it shows the correct SQL for eager loading, but the N+1 query still occurs when iterating over the posts: ```ruby @posts.each do |post| puts post.comments.count end ``` I've attempted to clear the cache and restart the server, but the behavior persists. Is there something I'm missing in my query optimization, or is there a Rails 7.1 specific behavior that I need to be aware of? Any insights or suggestions would be greatly appreciated! My development environment is Ubuntu. Any ideas what could be causing this? Is there a better approach? I'm coming from a different tech stack and learning Ruby. Thanks, I really appreciate it! I'm developing on Windows 11 with Ruby. For context: I'm using Ruby on macOS. Any suggestions would be helpful.