Unexpected Behavior when Using ActiveRecord Callbacks in Rails 7.1 with Nested Attributes
I'm not sure how to approach I'm getting frustrated with Hey everyone, I'm running into an issue that's driving me crazy... I'm running into an issue with ActiveRecord callbacks when using nested attributes in Rails 7.1. I have a `User` model that has many `Posts`, and I'm trying to use the `before_save` callback to modify some attributes based on the nested `Posts`. My expectation is that the `before_save` callback should trigger before the user is saved, allowing me to set some default values for the posts based on user input. However, I'm seeing that the callback does not seem to execute as intended when I submit the form, leading to some posts being saved without the necessary attributes being set. Here's the relevant part of my `User` model: ```ruby class User < ApplicationRecord has_many :posts, dependent: :destroy accepts_nested_attributes_for :posts before_save :set_default_post_attributes private def set_default_post_attributes posts.each do |post| post.title ||= 'Default Title' post.content ||= 'Default Content' end end end ``` And in my form, I'm using fields for nested attributes: ```erb <%= form_with(model: @user) do |f| %> <%= f.fields_for :posts do |post_fields| %> <%= post_fields.text_field :title %> <%= post_fields.text_area :content %> <% end %> <%= f.submit 'Save' %> <% end %> ``` When I submit the form without entering any titles or content, I expect the posts to have the default values set, but they just end up being nil. I noticed that the callback seems to be running, but the `posts` association is empty when I access it inside the `set_default_post_attributes` method. I’ve tried using `reload` on the posts after they’re built but that didn’t help either. I also checked if the posts are getting saved before the callback runs - they are, and the callback doesn't seem able to access the nested attributes correctly. Any advice on how to properly set default values for nested attributes in this scenario? For context: I'm using Ruby on Windows. Any ideas what could be causing this? The project is a application built with Ruby. For context: I'm using Ruby on Windows 10.