typescript - Prisma with GraphQL - 如何为指定的字符串数组提供显式类型 - 唯一命名问题

Question

我正在尝试弄清楚如何为一个字段指定显式类型，该字段在 Prisma 架构中定义为具有枚举值。

在我的模式中我有:

enum Category {
  CHANGE
  OPTION 
  OTHER
}

和一个使用 Category 的模型如下:

model Issue {
  id          String           @id @default(dbgenerated("gen_random_uuid()")) @db.Uuid
  title       String
  description String
  category    Category
  Template    Template[]
  createdAt   DateTime    @default(now()) @db.Timestamptz(6) 
  updatedAt   DateTime    @default(now()) @updatedAt @db.Timestamptz(6)
  User        User[]
}

然后在后端，我有一个模型:

import * as Prisma from "@prisma/client"

import { Field, ObjectType } from 'type-graphql'
import { BaseModel } from "../shared/base.model"
// - I tried this but it didn't help: import { Category } from "@generated"



@ObjectType()
export class Issue extends BaseModel implements Prisma.Issue {

    @Field()  
    title: string

    @Field()
    description: string

    @Field(() => Category)
    category: Prisma.Category
    
    
}

和一个都定义“类别”的输入文件，我认为我通过引用 Prisma 枚举提供了正确的类型(不确定我是否应该引用生成的类型)。

import { IsNotEmpty } from "class-validator"
import { Field, InputType } from "type-graphql"
import { Issue } from '../issue.model'
import * as Prisma from "@prisma/client"


@InputType()
export class IssueInput implements Partial<Issue> {
    @Field()
    @IsNotEmpty()
    title: string

    @Field()
    @IsNotEmpty()
    description: string

    @Field()
    @IsNotEmpty()
    category: Prisma.Category

    @Field()
    @IsNotEmpty()
    userId: string



}

当我尝试用它运行 yarn dev 时，我收到一条错误消息:

NoExplicitTypeError: Unable to infer GraphQL type from TypeScriptreflection system. You need to provide explicit type for 'category' of'IssueInput' class

如何确定如何为 IssueInput 类中的类别指定类型？我找不到如何执行此操作的示例。

我尝试添加:registerEnumType 到 IssueInput 定义和 Issue 模型，使用下面列出的想法:

import { IsNotEmpty } from "class-validator"
import { Field, InputType, registerEnumType } from "type-graphql"
import { Issue } from '../issue.model'
import * as Prisma from "@prisma/client"


registerEnumType(Prisma.Category, {
  name: "Category", // this one is mandatory
  description: "Issue Category", // this one is optional
});


@InputType()
export class IssueInput implements Partial<Issue> {
    @Field()
    @IsNotEmpty()
    title: string

    @Field()
    @IsNotEmpty()
    description: string

    @Field()
    @IsNotEmpty()
    category: Prisma.Category

    @Field()
    @IsNotEmpty()
    userId: string



}

我仍然收到一条错误消息:

NoExplicitTypeError: Unable to infer GraphQL type from TypeScriptreflection system. You need to provide explicit type for 'category' of'IssueInput' class.at Object.findType

当我像下面这样尝试时，我收到一个控制台错误，显示错误:架构必须包含唯一命名的类型，但包含多个名为“类别”的类型。我在架构文件中只有一个类别。

在我的终端中，错误的表达方式不同，它说:

Property 'category' in type 'IssueInput' is not assignable to the sameproperty in base type 'Partial'. Type 'Category' is notassignable to type 'Category | undefined'.Type '"CHANGE"' is not assignable to type 'Category | undefined'.

import { IsNotEmpty } from "class-validator"
import { Field, InputType, registerEnumType } from "type-graphql"
import { Issue } from '../issue.model'
import * as Prisma from "@prisma/client"


registerEnumType(Prisma.Category, {
  name: "Category", // this one is mandatory
  description: "Issue Category", // this one is optional
});


@InputType()
export class IssueInput implements Partial<Issue> {
    @Field()
    @IsNotEmpty()
    title: string

    @Field()
    @IsNotEmpty()
    description: string

    @Field(type => Prisma.Category)
    @IsNotEmpty()
    category: Prisma.Category
    // category: Prisma.Category | undefined -- this also does not solve the problem  


    @Field()
    @IsNotEmpty()
    userId: string



}

Answer 1

您需要使用 type-graphql 注册枚举。

import { registerEnumType } from "type-graphql";

registerEnumType(Prisma.Category, {
  name: "Category", // this one is mandatory
  description: "Issue Category", // this one is optional
});