daton/orm/src/model/relation/HasOneOrMany.ts

import {Model} from '../Model.ts'
import {Relation} from './Relation.ts'
import ConnectionExecutable from '../../builder/type/ConnectionExecutable.ts'
import {WhereBuilder} from '../../builder/type/WhereBuilder.ts'
import {ModelSelect} from '../query/ModelSelect.ts'
import {Collection} from '../../../../lib/src/collection/Collection.ts'

export abstract class HasOneOrMany<T extends Model<T>, T2 extends Model<T2>> extends Relation<T, T2> {
    constructor(
        protected parent: T,
        public readonly related: T2,
        protected foreign_key_spec?: string,
        protected local_key_spec?: string,
    ) { super(parent, related) }

    public get foreign_key() {
        return this.foreign_key_spec || this.parent.key_name()
    }

    public get local_key() {
        return this.local_key_spec || this.foreign_key
    }

    public get qualified_foreign_key() {
        return this.related.qualify_column(this.foreign_key)
    }

    public get qualified_local_key() {
        return this.related.qualify_column(this.local_key)
    }

    protected get parent_value() {
        // @ts-ignore
        return this.parent[this.local_key]
    }

    public query(): ConnectionExecutable<T2> {
        return this.builder().select('*')
    }

    public scope_query(where: WhereBuilder) {
        where.where(where => {
            where.where(this.qualified_foreign_key, '=', this.parent_value)
                .whereRaw(this.qualified_foreign_key, 'IS NOT', 'NULL')
        })
    }

    public build_eager_query(parent_query: ModelSelect<T>, result: Collection<T>): ModelSelect<T2> {
        const keys = result.pluck(this.local_key).toArray()
        return this.related.select().whereIn(this.foreign_key, keys)
    }

    public match_results(possibly_related: Collection<T>) {
        return possibly_related.where(this.foreign_key, '=', this.parent_value)
    }
}