ActiveRecord::RecordNotFound when trying to preload associations in Rails 7.1
I've encountered a strange issue with I tried several approaches but none seem to work... Quick question that's been bugging me - I'm working with an `ActiveRecord::RecordNotFound` behavior when trying to preload associations in my Rails 7.1 application. I have a `User` model that has many `Posts`, and each `Post` belongs to a `Category`. I suspect the scenario arises when I attempt to load users with their posts and categories in a single query. Here’s the code I’m using: ```ruby # app/controllers/users_controller.rb def index @users = User.includes(posts: :category).all end ``` However, when I try to access the category for a post in my view, I get the following behavior: ``` ActiveRecord::RecordNotFound in UsersController#index Couldn't find Category with 'id'=nil ``` This happens in my view when I loop through each user's posts: ```erb <% @users.each do |user| %> <h1><%= user.name %></h1> <% user.posts.each do |post| %> <h2><%= post.title %></h2> <p>Category: <%= post.category.name %></p> <% end %> <% end %> ``` I verified that all posts have valid categories associated with them. I also tried to isolate the question by running the following query in the Rails console: ```ruby User.includes(posts: :category).first ``` And it works without behavior. I’m not sure why the behavior appears in the view when I access the category name. Could there be a case where `post.category` is `nil`? How can I properly handle this situation to avoid the behavior? Any suggestions would be greatly appreciated! For context: I'm using Ruby on Ubuntu. Is there a better approach? This is part of a larger web app I'm building. Is there a better approach? I'm developing on CentOS with Ruby. Is there a better approach?