fairnesscoop / pictyschool

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

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

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

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

export class IsDiscountAlreadyExist {

  constructor(

    @Inject('IDiscountRepository')

    private readonly discountRepository: IDiscountRepository

  ) {}

  public async isSatisfiedBy(amount: number, school: School): Promise<boolean> {

    return (

      (await this.discountRepository.findOneByAmountAndSchool(amount, school)) instanceof Discount

    );

  }

}