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best practices for N+1 query solution with eager loading in Rails 7.1 when querying associated records?

๐Ÿ‘€ Views: 100 ๐Ÿ’ฌ Answers: 1 ๐Ÿ“… Created: 2025-06-13
ruby-on-rails activerecord eager-loading n+1-queries Ruby

I'm not sure how to approach I need some guidance on I'm working with a performance scenario in my Rails 7.1 application where I'm working with an N+1 query question when loading users and their associated posts. I've tried using `includes` for eager loading, but it doesn't seem to have the desired effect. Hereโ€™s what my code looks like: ```ruby # In the controller @users = User.includes(:posts).all ``` In my view, Iโ€™m displaying the users and their posts like this: ```erb <% @users.each do |user| %> <h2><%= user.name %></h2> <% user.posts.each do |post| %> <p><%= post.title %></p> <% end %> <% end %> ``` When I inspect the SQL queries in the development log, I'm still seeing one query for all the users followed by separate queries for each userโ€™s posts, resulting in multiple queries being executed. Iโ€™ve also tried adding `joins` but that doesn't seem to fetch the post data correctly. I've checked the database and indices, and it seems fine. Iโ€™m not sure what I'm missing here. Is there a specific way to ensure that the eager loading works as intended in this scenario? I would appreciate any insights or best practices that could help resolve this performance scenario. For context: I'm using Ruby on Linux. Any ideas how to fix this? This is my first time working with Ruby latest. Any help would be greatly appreciated!