Rails 7: Trouble with JSON API Responses and ActiveModel Serializers on Nested Associations
I'm migrating some code and I'm not sure how to approach Hey everyone, I'm running into an issue that's driving me crazy. I'm building a Rails 7 API that returns JSON responses for a blog application... I'm using ActiveModel Serializers to serialize my objects, but I'm encountering issues with nested associations not being serialized correctly. For example, when fetching a post with its associated comments, the response doesn't include the comment attributes as expected. I have the following models set up: ```ruby class Post < ApplicationRecord has_many :comments end class Comment < ApplicationRecord belongs_to :post end ``` And my serializers look like this: ```ruby class PostSerializer < ActiveModel::Serializer attributes :id, :title, :body has_many :comments end class CommentSerializer < ActiveModel::Serializer attributes :id, :content, :created_at end ``` When I make a request to `/api/posts/1`, the JSON response only includes the post data but not the associated comments: ```json { "id": 1, "title": "First Post", "body": "This is the body of the first post." } ``` I expected the output to look like this, including the comments: ```json { "id": 1, "title": "First Post", "body": "This is the body of the first post.", "comments": [ { "id": 1, "content": "Great post!", "created_at": "2023-10-01T12:00:00Z" } ] } ``` I've checked the controller and confirmed that the comments are being loaded with the post. I'm using Rails 7.0.3 and the following code in my PostsController: ```ruby class Api::PostsController < ApplicationController def show post = Post.includes(:comments).find(params[:id]) render json: post, serializer: PostSerializer end end ``` I also tried calling `render json: post, include: :comments` directly, but that didn't work either. It seems like the association is not being serialized as intended. Am I missing something in the configuration, or is there a specific way to handle nested associations with ActiveModel Serializers in Rails 7? Any help would be greatly appreciated! This is part of a larger web app I'm building. How would you solve this? I'm developing on Ubuntu 20.04 with Ruby. Hoping someone can shed some light on this.