How To: Return a computed relationship in a read.
I have a resource like Posts. Each
Post has a 'top comment'. So when i'm fetching a Post or list of Posts, I will like it to include the top comment like so: post.top_comment.
I'm currently trying to use a preparation to load this relationship but not sure how to execute it on the Ash.Query side of things. Any ideas here would be appreciated!11 Replies
So what im thinking is making this into a relationship on
Post, so post has_one :top_comment, Comment. What im trying to figure out now is how to hook this up to the Ash.Query engine. I think what im looking for is a way to join into Comments against some attribute, and merge that into the PostYou can use a relationship itself to do this 🙂
oh, so you already have the relationship
I'm a bit confused about the need here
using
Ash.Query.load should load the related value, and it should be available as thing.top_comment, right?It does load it, but it loads all
Comments . What I would like is to join Comment on Post, something like so where comment.post_id == post_id and comment.some_attribute == true, Right now its returning all Comments instead of by a specific filter on the relationship/queryHave you added a
top_comment relationship?
like:
Thats just one example
manual relationships can be used if it gets more complex
filters can be used as wellOn man thats so beautiful! It works
However, the
type field in the includes on AshJsonApi is returning null for some reason, maybe something to do with the has_one?🤔 hard to say
oh
if you want to include it it needs to be configured in the json_api block explicitly
i.e
includes [:top_comment]its included, and it returns the correct includes, just the
type field is nullhummm
do you have a json_api type configured on
Comment?same on the relationship field on the attribute level too, id is present, type is null
so type is null for both of them?
ah, you are right on, I didnt define it there