Custom Service

To create a custom query service to add your own methods to you can extend the MongooseQueryService.

todo-item.service.ts

import { Model } from 'mongoose'import { QueryService } from '@nestjs-query/core';import { InjectModel } from '@nestjs/mongoose';import { MongooseQueryService } from '@nestjs-query/query-mongoose';import { TodoItemEntity } from './entity/todo-item.entity';
@QueryService(TodoItemEntity)export class TodoItemService extends MongooseQueryService<TodoItemEntity> {  constructor(@InjectModel(TodoItemEntity.name) model:  Model<TodoItemEntity>) {    super(model);  }
  async markAllAsCompleted(): Promise<number> {    const entities = await this.query({ filter: { completed: { is: true } } });
    const { updatedCount } = await this.updateMany(      { completed: true }, // update      { id: { in: entities.map((e) => e.id) } }, // filter    );    // do some other business logic    return updatedCount;  }}

To use the custom service in the auto-generated resolver you can specify the ServiceClass option.

todo-item.module.ts

import { NestjsQueryGraphQLModule } from '@nestjs-query/query-graphql';import { NestjsQueryMongooseModule } from '@nestjs-query/query-mongoose';import { Module } from '@nestjs/common';import { TodoItemDTO } from './dto/todo-item.dto';import { TodoItemEntity } from './todo-item.entity';import { TodoItemService } from './todo-item.service';
@Module({  imports: [    NestjsQueryGraphQLModule.forFeature({      imports: [        NestjsQueryMongooseModule.forFeature([          { document: TodoItemEntity, name: TodoItemEntity.name, schema: TodoItemEntitySchema },        ]),      ],      services: [TodoItemService],      resolvers: [        {          DTOClass: TodoItemDTO,          ServiceClass: TodoItemService,        },      ],    }),  ],})export class TodoItemModule {}