fairnesscoop / pictyschool

import { Inject } from '@nestjs/common';

import { IShippingCostRepository } from '../Repository/IShippingCostRepository';

import { ShippingCost } from '../ShippingCost.entity';

export class IsShippingCostAlreadyExist {

  constructor(

    @Inject('IShippingCostRepository')

    private readonly shippingcostRepository: IShippingCostRepository

  ) {}

  public async isSatisfiedBy(grams: number): Promise<boolean> {

    return (

      (await this.shippingcostRepository.findOneByGrams(grams)) instanceof ShippingCost

    );

  }

}