collection-field.ts
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collection-field.ts
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	import { Context } from "koa";
	import { Depromisify, Field, FieldOutput } from "sealious";
	import { FormDataValue } from "../form";

	import {
	FieldParseResult,
	FormField,
	FormFieldValidationResponse,
	} from "./field";

	export class CollectionField<F extends Field> extends FormField<
	FieldOutput<F>
	> {
	constructor(required: boolean, public sealiousField: F) {
	super(required);
	}

	async parse(
	ctx: Context,
	raw_value: FormDataValue
	): Promise<FieldParseResult<FieldOutput<F>>> {
	const encoded_value = (await this.sealiousField.encode(
	ctx.$context,
	raw_value
	)) as Depromisify<ReturnType<F["encode"]>>;
	const parsed_value = (await this.sealiousField.decode(
	ctx.$context,
	encoded_value,
	null,
	{}
	)) as Depromisify<ReturnType<F["encode"]>>;
	return {
	parsable: true,
	error: null,
	parsed_value,
	};
	}

	public async isValueValid(
	ctx: Context,
	value: FieldOutput<F>
	): Promise<FormFieldValidationResponse> {
	const { valid, reason } = await this.sealiousField.checkValue(
	ctx.$context,
	value,
	undefined
	);
	return { valid, message: reason \|\| (!valid ? "Wrong value" : "") };
	}

	public getEmptyValue(): Depromisify<ReturnType<F["decode"]>> {
	return "" as unknown as Depromisify<ReturnType<F["decode"]>>;
	}
	}