How to implement NoMethodError for nil:NilClass when using ActiveModel serializer with nested attributes in Rails 7?
I'm sure I'm missing something obvious here, but I'm working with a `NoMethodError` for `nil:NilClass` when I attempt to serialize a model that has nested attributes using `ActiveModel::Serializers` in Rails 7..... My model `Post` has many `Comments`, and I'm trying to serialize them in the response. However, I'm getting this behavior when a post has no comments. Here's a simplified version of my code: ```ruby class Post < ApplicationRecord has_many :comments, dependent: :destroy accepts_nested_attributes_for :comments end class Comment < ApplicationRecord belongs_to :post end class PostSerializer < ActiveModel::Serializer attributes :id, :title, :body has_many :comments end ``` And in my controller action, I have: ```ruby def show post = Post.find(params[:id]) render json: post, serializer: PostSerializer end ``` When a post does have comments, everything works fine, but if there are no comments, the response fails with the `NoMethodError`. I've tried adding a guard clause in the `PostSerializer` to check if `comments` is present, but it doesn't seem to resolve the scenario. Here's what I attempted: ```ruby class PostSerializer < ActiveModel::Serializer attributes :id, :title, :body def comments object.comments || [] end end ``` Also, I'm using `ActiveModelSerializers` version 0.10.6. I thought that the use of `|| []` would handle the nil case, but the behavior continues. Am I missing something in the way I defined the relationship or the serializer? Any help would be greatly appreciated! Has anyone else encountered this? I'm working on a CLI tool that needs to handle this. Is there a better approach?