hasOwnProperty 总是使用 Typescript 返回 false

Question

I'm implementing a filter in TypeGraphQL and I'm first checking to see if the Class has the property requested by the user to filter. I'm trying to use hasOwnProperty but it always returns false even though the property is correct.

Query within Resolver:

@Query(() => [Dog] )
  async dogs(
    @Arg('filter') filter: FilterInput
  ): Promise<Dog []> {
    console.log(filter.field)
    console.log(Dog.prototype.hasOwnProperty(filter.field))

    const dogs = await Dog.find({where: {[filter.field]: `${filter.value}`}})

    return dogs
  }

Dog Entity:

@ObjectType()
@Entity()
export class Dog extends BaseEntity {
  @Field(() => ID)
  @PrimaryGeneratedColumn()
  id: number

  @Field()
  @Column()
  name: string

  @Field()
  info(@Root() parent: Dog): string {
    return `gender: ${parent.gender} ; name: ${parent.name}`
  }

  @Field()
  @Column()
  gender: string
}

FilterInput Type:

import { InputType, Field } from "type-graphql";


@InputType()
export class FilterInput {
  @Field()
  field: string

  @Field()
  value: string
}

Answer 1

I was able to solve this with an enum and just compare the input string with the enum values enum:

export enum dogFields {
  name = 'name',
  gender = 'gender'
}