Mongodb，Typegoose泛型存储库模式

Question

@类型鹅/打字鹅“："^7.2.0”

有没有办法用类型圈和类型鹅来建立通用的CRUD存储库？特别是，如何使getModelForClass()方法与泛型一起工作？类似于从问题246借用的代码。

如果是的话，我遗漏了什么？

import { prop, getModelForClass } from '@typegoose/typegoose';
import { AnyParamConstructor, ReturnModelType } from '@typegoose/typegoose/lib/types';

export class GenericCRUDService<T, U extends AnyParamConstructor<T> = AnyParamConstructor<T>> {
  dataModel: ReturnModelType<U, T>;

  constructor(cls: U) {
    this.dataModel = getModelForClass<T, U>(cls);
  }

  public create(data: T) {
    this.dataModel.create(data);
  }
}

export class Cat {
  @prop()
  public age: number;
  @prop()
  public color: string;
}

export class Dog {
  @prop()
  public isBarking: boolean;
  @prop()
  public race: string;
}

Answer 1

参考文献：https://github.com/typegoose/typegoose/issues/303

如果您想要一个"manager类“而不是实际的模型是泛型的，这很容易，您只需要有正确的类型。

我建议把这门课写成：

// NodeJS: 14.4.0
// MongoDB: 4.2-bionic (Docker)
import { getModelForClass, prop, types, ReturnModelType, DocumentType } from "@typegoose/typegoose"; // @typegoose/typegoose@7.2.0
import * as mongoose from "mongoose"; // mongoose@5.9.18 @types/mongoose@5.7.27

export class GenericCRUDService<U extends types.AnyParamConstructor<any>> {
  public dataModel: ReturnModelType<U>;

  constructor(cls: U) {
    this.dataModel = getModelForClass(cls);
  }

  public create(data: mongoose.CreateQuery<DocumentType<InstanceType<U>>>) {
    this.dataModel.create(data);
  }
}

export class Cat {
  @prop()
  public age?: number;

  @prop()
  public color?: string;
}

export class Dog {
  @prop()
  public isBarking?: boolean;

  @prop()
  public race?: string;
}

(async () => {
  await mongoose.connect(`mongodb://localhost:27017/`, { useNewUrlParser: true, dbName: "verifyMASTER", useCreateIndex: true, useUnifiedTopology: true });

  const CatService = new GenericCRUDService(Cat);

  await CatService.create({}); // with type support (since ~@types/mongoose@5.7.21)

  await mongoose.disconnect();
})();

(使用旧示例的问题是，由于7.1.0“不必要”的T泛型被删除了)