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我正在尝试在我的验证器中运行猫鼬查询

您好，我正在尝试制作一个自定义装饰器，如果该字段的值已存在，它会抛出错误。我正在尝试在验证路线的类中使用猫鼬模型。与解析器/控制器不同，它@InjectModel()在验证器类中不起作用。我的验证器是这样的

import { getModelToken, InjectModel } from "@nestjs/mongoose";
import {
  ValidationArguments,
  ValidatorConstraint,
  ValidatorConstraintInterface,
} from "class-validator";
import { Model } from "mongoose";
import { User } from "../schema/user.schema";

@ValidatorConstraint({ name: "IsUniqueUser", async: true })
export class UniqueValidator implements ValidatorConstraintInterface {
  constructor(
    @InjectModel(User.name)
    private readonly userModel: Model<User>,
  ) {}

  async validate(value: any, args: ValidationArguments) {
    const filter = {};

    console.log(this.userModel);
    console.log(getModelToken(User.name));
    filter[args.property] = value;
    const count = await this.userModel.count(filter);
    return !count;
  }

  defaultMessage(args: ValidationArguments) {
    return "$(value) …