value-not-existing-in-collection.js
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value-not-existing-in-collection.js
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	const assert = require("assert");

	module.exports = app => {
	return {
	name: "value-not-existing-in-collection",
	extends: "value-existing-in-collection",
	is_proper_value: async (context, params, new_value) => {
	assert.equal(typeof params.field, "string");
	assert(
	typeof params.include_forbidden === "boolean" \|\|
	params.include_forbidden === undefined
	);
	const collection = params.collection;
	assert(collection instanceof app.Sealious.Collection);
	await collection.fields[params.field].is_proper_value(context, new_value);
	if (params.include_forbidden) {
	context = new app.Sealious.SuperContext();
	}
	const matches = await app.run_action(
	context,
	["collections", collection.name],
	"show",
	{ filter: { [params.field]: new_value } }
	);
	if (matches.length) {
	return Promise.reject(
	`No ${collection.name} with ${params.field} set to ${new_value}`
	);
	} else {
	return Promise.resolve();
	}
	},
	};
	};