Hello guys, I did a test using ManyToOne but I get the following error:

error: error: invalid reference to FROM-clause entry for table "comment"

The error occurs when I run the following route

GET http://localhost:3000/post/1/comment

Looking at the log, I saw the following QUERY:

SELECT "Comment"."id" AS "Comment_id", "Comment"."text" AS "Comment_text", "post"."id" AS "post_id", "post"."body" AS "post_body", "post"."commentsId" FROM "comment" "Comment" LEFT JOIN "post" "post" ON "post"."commentsId"="Comment"."id" WHERE (Comment.postId = $1)

And doing tests directly in the database and works with this SQL (I added the quotes on WHERE it)

SELECT "Comment"."id" AS "Comment_id", "Comment"."text" AS "Comment_text", "post"."id" AS "post_id", "post"."body" AS "post_body", "post"."commentsId" FROM "comment" "Comment" LEFT JOIN "post" "post" ON "post"."commentsId"="Comment"."id" WHERE ("Comment"."postId" = $1)

It is probably some wrong setting I made. I did some tests and research, both in TypeORM, and directly in the PG plugin but I was not successful.

follows some useful files

dependencies in package.json

  "dependencies": {
    "@nestjs/common": "^6.7.2",
    "@nestjs/core": "^6.7.2",
    "@nestjs/platform-express": "^6.7.2",
    "@nestjs/typeorm": "^6.2.0",
    "@nestjsx/crud": "^4.4.1",
    "@nestjsx/crud-typeorm": "^4.4.1",
    "class-transformer": "^0.2.3",
    "class-validator": "^0.11.0",
    "pg": "^7.17.1",
    "reflect-metadata": "^0.1.13",
    "rimraf": "^3.0.0",
    "rxjs": "^6.5.3",
    "typeorm": "^0.2.22"
  },

Main Module

import { Module } from '@nestjs/common';
import { AppController } from './app.controller';
import { AppService } from './app.service';
import { TypeOrmModule } from '@nestjs/typeorm';
import { PostModule } from './post/post.module';
import { CommentModule } from './comment/comment.module';
import { Comment } from './comment/comment.entity';
import { Post } from './post/post.entity';

@Module({
  imports: [
    TypeOrmModule.forRoot({
      type: 'postgres',
      host: 'localhost',
      port: 5432,
      username: 'postgres',
      password: 'postgres',
      database: 'test',
      logging: true,
      entities: [
        Post, Comment
      ],
      synchronize: true,
    }),
    PostModule,
    CommentModule,
  ],
  controllers: [AppController],
  providers: [AppService],
})
export class AppModule {}

Entities

Post

import { Entity, PrimaryGeneratedColumn, Column, ManyToOne } from "typeorm";
import { Comment } from '../comment/comment.entity';

@Entity()
export class Post {

    @PrimaryGeneratedColumn()
    id: number

    @Column()
    body: string

    @ManyToOne(type => Comment, c => c.post)
    comments: Post[]
}

Comment

import { Entity, PrimaryGeneratedColumn, Column, OneToMany } from "typeorm";
import { Post } from '../post/post.entity';


@Entity()
export class Comment {

    @PrimaryGeneratedColumn()
    id: number

    @Column()
    text: string

    @OneToMany(type => Post, p => p.comments)
    post: Post
}

Modules

Post

import { Module } from "@nestjs/common";
import { TypeOrmModule } from "@nestjs/typeorm";

import { Comment } from "./comment.entity";
import { CommentService } from "./comment.service";
import { CommentController } from "./comment.controller";

@Module({
  imports: [TypeOrmModule.forFeature([Comment])],
  providers: [CommentService],
  exports: [CommentService],
  controllers: [CommentController]
})
export class CommentModule {}

Comment

import { Module } from "@nestjs/common";
import { TypeOrmModule } from "@nestjs/typeorm";

import { Post } from "./post.entity";
import { PostService } from "./post.service";
import { PostController } from "./post.controller";

@Module({
  imports: [TypeOrmModule.forFeature([Post])],
  providers: [PostService],
  exports: [PostService],
  controllers: [PostController]
})
export class PostModule {}

Services

Post

import { Injectable } from "@nestjs/common";
import { InjectRepository } from "@nestjs/typeorm";
import { TypeOrmCrudService } from "@nestjsx/crud-typeorm";

import { Comment } from "./comment.entity";

@Injectable()
export class CommentService extends TypeOrmCrudService<Comment> {
  constructor(@InjectRepository(Comment) repo) {
    super(repo);
  }
}

Comment

import { Injectable } from "@nestjs/common";
import { InjectRepository } from "@nestjs/typeorm";
import { TypeOrmCrudService } from "@nestjsx/crud-typeorm";

import { Comment } from "./comment.entity";

@Injectable()
export class CommentService extends TypeOrmCrudService<Comment> {
  constructor(@InjectRepository(Comment) repo) {
    super(repo);
  }
}

Controller

Post

import { Controller } from "@nestjs/common";
import { Crud, CrudController } from "@nestjsx/crud";

import { Comment } from "./comment.entity";
import { CommentService } from "./comment.service";

@Crud({
  model: {
    type: Comment
  },
  params: {
    id: {
        field: 'id',
        type: 'number',
        primary: true,
    },
      postId: {
          field: 'postId',
          type: 'number'
      },
    
  },
  query: {
    join: {
        post: {
            eager: true
        }
    }
  }
})
@Controller("post/:postId/comment")
export class CommentController implements CrudController<Comment> {
  constructor(public service: CommentService) {}
}

Comment

import { Controller, Get } from '@nestjs/common';
import { AppService } from './app.service';

@Controller()
export class AppController {
  constructor(private readonly appService: AppService) {}

  @Get()
  getHello(): string {
    return this.appService.getHello();
  }
}

What am I doing wrong? I already appreciate the help 😄