Confusing whereHas functionality

[shahar-mintz]

Hey, I've been using adonis-lucid-polymorphic on a new project and just encountered a confusing issues. Briefly, the MorphTo's whereHas query (seems like also true for has query) only considers the first model in the relatedModels array, resulting in incomplete results.

Example:
Model Setup

class Video extends Model {
}

class Post extends Model {
}

class Comment extends Model {
  static get traits () {
    return ['@provider:Morphable']
  }

  commentable () {
    return this.morphTo([
      Video,
      Post
    ], 'id', 'id', 'commentable_id', 'commentable_type')
  }
}

When I run this code

let _query = null;
Comment.onQuery((query) => (_query = query));
await Comment.query().whereHas('commentable', b=>b.where('id', '>', 2)).fetch();

The resulting SQL query (_query.sql) is
'select * from "comments" where exists (select * from "videos" where "id" > ? and "comments"."commentable_id" = "videos"."id")'

The problem
The query should return all the comments for the commentables with id>2. Instead, it considers only the Video model and neglects the Post model. So for example, if I had no videos but only 10 posts (ids 1-10), the query would return zero results which isn't correct (should have returned 8 posts, with ids 3-10).

Thanks for your help.