Unexpected JSON Serialization implementing ActiveModel Serializers in Rails 7.1
I'm sure I'm missing something obvious here, but I've been banging my head against this for hours. I'm experiencing problems with JSON serialization when using ActiveModel Serializers in my Rails 7.1 app. I have a model `Post` that includes a few associations, and I'm trying to serialize it along with its associated `Comments`. However, when I include the `comments` association in the serializer, I'm getting an unexpected `nil` for the comments in the response, even though they exist in the database. Here’s what my `PostSerializer` looks like: ```ruby class PostSerializer < ActiveModel::Serializer attributes :id, :title, :content has_many :comments end ``` I am specifically calling the serializer in my controller like this: ```ruby def show post = Post.includes(:comments).find(params[:id]) render json: post, serializer: PostSerializer end ``` I've confirmed that the `comments` association is being eager-loaded by inspecting the `post.comments` in the console, and it returns the correct comments. However, the serialized output is: ```json { "id": 1, "title": "My First Post", "content": "This is the content of the post", "comments": null } ``` I also tried explicitly adding the `comments` relationship in the serializer, but it didn’t resolve the scenario. I am not getting any errors in the console, and I have verified that the `Post` model has the correct `has_many :comments` association defined. Are there any known issues or configurations I might be missing in ActiveModel Serializers that could lead to this unexpected behavior? My development environment is Ubuntu. Am I missing something obvious?