IsReferencedByResourcesMatching.js
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IsReferencedByResourcesMatching.js
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	const locreq = require("locreq")(__dirname);
	const assert = require("assert");
	const Collection = locreq("lib/chip-types/collection");
	const Query = locreq("lib/datastore/query.js");

	module.exports = app => {
	const parametrized = app.SpecialFilter.WithParams(
	class IsReferencedByResourcesMatching extends app.SpecialFilter {
	constructor(params) {
	const {
	collection,
	referencing_field,
	field_to_check,
	allowed_values,
	nopass_reason,
	} = params;
	super(params);
	assert(params);
	assert(collection);
	assert(collection instanceof Collection);
	assert(collection.fields[referencing_field]);
	assert(collection.fields[field_to_check]);
	assert(Array.isArray(allowed_values));
	assert(typeof nopass_reason === "string");
	}
	async getFilteringQuery() {
	const query = new Query();
	const lookup_id = query.lookup({
	from: this.params.collection.name,
	localField: "sealious_id",
	foreignField: `body.${this.params.referencing_field}`,
	});
	query.match({
	[`${lookup_id}.body.${this.params.field_to_check}`]: {
	$in: this.params.allowed_values,
	},
	});
	return query;
	}

	getNopassReason() {
	return this.params.nopass_reason;
	}
	}
	);
	app.SpecialFilter.IsReferencedByResourcesMatching = parametrized;
	};