Polymorphic Relationship integration

[Stephan-MC]

I am currently in a startup which is trying to develop a small tech ecosystem to provide mulitple services and choosed adonisJS as backend. We got an issue where we needed to choose whether or not to use polymorphic relationships and saw it'll be beneficial to use them for maintainance purpose and scalability.

i start implementing a decorator to create polymorphic relations in adonisJS but got stucked along the line where i can understand what is wrong.

let me try breaking things down. I created a monel named attachment which should handle an file (document, image, video, etc) associated with another model (User, Post, etc..).

i started something like this below but got to some point where i don't understand what's going wrong and my adonis server truncates errors which i can use to debug.

import { NormalizeConstructor } from "@adonisjs/core/types/helpers";
import { LucidModel } from "@adonisjs/lucid/types/model";
import {
    ManyToMany,
    ManyToManyDecorator,
    ManyToManyRelationOptions,
} from "@adonisjs/lucid/types/relations";
import "reflect-metadata";

export interface MorphMany<
	Related extends LucidModel,
	Parent extends LucidModel = LucidModel,
> extends ManyToMany<Related, Parent> {}

export interface MorphToManyRelationOptions<Related extends LucidModel>
	extends ManyToManyRelationOptions<MorphMany<Related>> {
	morphKey?: string;
}

export interface MorphManyDecorator extends ManyToManyDecorator {}

export function morphMany<Related extends LucidModel>(
	related: () => Related,
	options: Omit<MorphToManyRelationOptions<Related>, "pivotForeignKey"> = {
		morphKey: "entity",
	},
) {
	return function decorateAsRelation(
		target: NormalizeConstructor<LucidModel>,
		property: string,
	) {
		const Model = target.constructor as LucidModel;
		Model.boot();

		Model.$addRelation(
			property,
			"manyToMany",
			related,
			Object.assign(
				{ related },
				{
					...options,
					pivotForeignKey: `${options.morphKey}_id`,
					onQuery: (query: any) => {
						const newQuery = query.where(
							`${options.morphKey}_type`,
							target.constructor.name,
						);
						options.onQuery?.(newQuery);
					},
				},
			),
		);
	};
}

will really appreciate if someone from the lucidORM team or anyone really confortable with this ORM to help me understand how i could come up with this.

[Stephan-MC]

it's been a long wait...

i think i can't have assistance on polymorphic relationships on adonisJS. I guess i'll just look for another framework which is compatible.