|string> */ public function rules(): array { return [ 'institution_id' => ['nullable', 'integer', 'exists:institutions,id'], 'user_id' => ['nullable', 'integer', 'exists:users,id'], 'user_position_id' => ['nullable', 'integer', 'exists:user_positions,id'], 'open' => ['nullable', 'boolean'], 'trashed' => ['nullable', Rule::in(['with', 'only'])], 'per_page' => ['nullable', 'integer', 'min:1', 'max:100'], ]; } }