Method copy

packages/hydrooj/src/model/problem.ts:252–264

(domainId: string, _id: number, target: string, pid?: string, hidden?: boolean)

    }

    static async copy(domainId: string, _id: number, target: string, pid?: string, hidden?: boolean) {
        const original = await ProblemModel.get(domainId, _id);
        if (!original) throw new ProblemNotFoundError(domainId, _id);
        if (original.reference) throw new ValidationError('reference');
        if (pid && (/^[0-9]+$/.test(pid) || await ProblemModel.get(target, pid))) pid = '';
        if (!pid && original.pid && !await ProblemModel.get(target, original.pid)) pid = original.pid;
        const $set = { hidden: hidden || original.hidden, reference: { domainId, pid: _id } } as any;
        if (typeof original.difficulty === 'number') $set.difficulty = original.difficulty;
        return await ProblemModel.add(
            target, pid, original.title, original.content,
            original.owner, original.tag, $set,
        );
    }

    static push<T extends ArrayKeys<ProblemDoc>>(domainId: string, _id: number, key: ArrayKeys<ProblemDoc>, value: ProblemDoc[T][0]) {
        return document.push(domainId, document.TYPE_PROBLEM, _id, key, value);