ActiveRecord Query for Paginated Nested Attributes in Rails 7 Causes N+1 Query solution
I just started working with I've been banging my head against this for hours....... I'm working on a project and hit a roadblock. I've searched everywhere and can't find a clear answer. I tried several approaches but none seem to work. I'm working with an N+1 query scenario when trying to paginate a list of `Post` records along with their associated `Comments` in my Rails 7 application. I've set up my models with the following associations: ```ruby class Post < ApplicationRecord has_many :comments end class Comment < ApplicationRecord belongs_to :post end ``` In my controller, I'm trying to fetch the posts with their comments like this: ```ruby @posts = Post.includes(:comments).paginate(page: params[:page], per_page: 10) ``` However, when I render the posts in my view, I see that the number of database queries skyrockets when I access the `comments` for each post. I have the following view code: ```erb <% @posts.each do |post| %> <h2><%= post.title %></h2> <ul> <% post.comments.each do |comment| %> <li><%= comment.body %></li> <% end %> </ul> <% end %> ``` Despite using `includes`, I still notice the N+1 question in my logs. The SQL output shows that for every post, it fetches comments separately, suggesting that the eager loading isn't functioning as expected. I’m using `will_paginate` gem for pagination and have verified that it's correctly initialized in my Gemfile. I’ve tried running the same query in the Rails console and confirmed that the eager loading works as intended there. I also made sure that there are no scopes or conditions that might interfere with the loading. I’ve also checked if the pagination gem is somehow conflicting, but I couldn’t find any mention of such issues related to `will_paginate`. Could this scenario be related to how pagination interacts with eager loading in Rails 7? What steps should I take to avoid the N+1 question in this situation? Any insights would be appreciated! My development environment is Linux. Am I missing something obvious? Has anyone else encountered this? I'm working on a mobile app that needs to handle this. Thanks for your help in advance! This is my first time working with Ruby stable. I appreciate any insights! The stack includes Ruby and several other technologies. Any examples would be super helpful. This issue appeared after updating to Ruby 3.9.