Rails 7.1: implementing custom finder methods returning unexpected results for polymorphic associations
I'm building a feature where I'm working with an scenario with custom finder methods in a Rails 7.1 application that utilizes polymorphic associations. I have a `Comment` model that belongs to a polymorphic `commentable` association. When I implement custom finder methods to retrieve comments based on their association type, I'm getting unexpected results, and I'm unsure if it's due to how I'm building the queries. Here’s a simplified version of my models: ```ruby class Comment < ApplicationRecord belongs_to :commentable, polymorphic: true end class Post < ApplicationRecord has_many :comments, as: :commentable end class Photo < ApplicationRecord has_many :comments, as: :commentable end ``` I have a custom method in my `Comment` model that looks like this: ```ruby def self.for_commentable(commentable) where(commentable_type: commentable.class.name, commentable_id: commentable.id) end ``` When I call `Comment.for_commentable(post)` where `post` is an instance of `Post`, I expect to get the comments associated with that particular post. However, occasionally, I receive comments from other associated models. Debugging further, I added logging to see the generated SQL: ```sql SELECT "comments".* FROM "comments" WHERE "comments"."commentable_type" = 'Post' AND "comments"."commentable_id" = 1 ``` This looks correct, but I noticed that the `commentable_type` and `commentable_id` sometimes do not match what I expect. I’ve checked the database and confirmed that the data integrity is correct, yet I still run into this scenario occasionally. I've also tried using `includes` to eager load comments and reduce N+1 problems, but that didn’t seem to impact the results. Additionally, I've verified that the `commentable` associations are correctly set up and that there are no duplicate records in the `comments` table. Can anyone provide insights on why I might be getting unexpected results or suggest alternative approaches for retrieving comments based on polymorphic associations? Any help would be appreciated! What's the correct way to implement this?