reference-field.ts
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reference-field.ts
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	/*
	The class has a dual nature, developer has a possibility to refer to it
	as if it was a string e.g.:

	console.log(item.reference_field) // 'SomeId'

	but (s)he also can use it as a container for item which is referenced e.g.:

	console.log(item.reference_field.name) // 'Some cool name'
	*/

	import Item from "../response/item";

	export function make(
	attachments: { [id: string]: Item },
	fieldsWithAttachments: { [field_name: string]: {} },
	id: string \| any,
	field_name: string
	) {
	return new ReferenceField(
	{ attachments, fieldsWithAttachments, field_name },
	id.toString()
	);
	}

	export default class ReferenceField extends String {
	_value: string;
	[field: string]: any;
	constructor(
	attachments_params: {
	attachments: any;
	fieldsWithAttachments: any;
	field_name?: string;
	},
	id: string
	) {
	super(id);
	this._value = id;
	const body = this.extractAttachmentsForId(attachments_params);
	for (let field of Object.keys(body)) {
	this[field] = body[field];
	}
	}
	extractAttachmentsForId({
	attachments,
	fieldsWithAttachments,
	}: {
	attachments: { [id: string]: Item };
	fieldsWithAttachments: { [field_name: string]: {} };
	}) {
	const body = attachments[this._value];

	for (let name of Object.keys(fieldsWithAttachments)) {
	let id = body[name];
	body[name] = make(
	attachments,
	fieldsWithAttachments[name],
	id,
	name
	);
	}
	return body;
	}
	toString() {
	return this._value;
	}
	valueOf() {
	return this._value;
	}
	toJSON() {
	return this._value;
	}
	}