如何将 GeoJSON 多边形数据发送到 typeorm (NestJS)？

Question

我想通过 POST 请求将 GeoJSON 多边形数据发送到 PostgresSQL。

因此，我尝试接收 Position[][] 类型并将其转换为 Polygon 类型，然后通过 Postman 发送 POST 请求以进行 API test 但 我收到一个错误：“QueryFailedError：无法在 GeoJSON 字符串中找到 'coordinates'”。

有我的代码：

实体

 import { Column, Entity, Index, PrimaryGeneratedColumn } from "typeorm";
 import { Polygon } from "geojson";

 @Entity({ name: 'parcels' })
 export class Parcel {

     @PrimaryGeneratedColumn('uuid')
     id: string

     @Index({ spatial: true })
     @Column({
         type: 'geography',
         spatialFeatureType: 'Polygon',
         srid:4326,
         nullable: true
     })
     polygon: Polygon

 }

Dto

 import { IsOptional } from "class-validator";
 import { Position } from "geojson";

 export class CreateParcelPointDto { 
     @IsOptional()
     position?: Position[][]
 }

控制器

 import { Body, Controller, Post } from '@nestjs/common';
 import { CreateParcelPointDto } from './dto/create-parcel-point.dto';
 import { Parcel } from './parcel.entity';
 import { ParcelService } from './parcel.service';

 @Controller('parcels')
 export class ParcelController {
     constructor(private parcelService: ParcelService) {}

     @Post()
     async createParcelPoint(
         @Body()
         createParcelPointDto: CreateParcelPointDto
     ): Promise<Parcel> {
         return this.parcelService.createParcelPoint(createParcelPointDto)
     }
 }

服务

 import { Injectable } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 import { Polygon } from 'geojson';
 import { CreateParcelPointDto } from './dto/create-parcel-point.dto';
 import { ParcelRepository } from './parcel.repository';
 import { Parcel } from './parcel.entity';

 @Injectable()
 export class ParcelService {
     constructor(
         @InjectRepository(ParcelRepository)
         private parcelRepository: ParcelRepository
     ) {}

     async createParcelPoint(createParcelPointDto: CreateParcelPointDto): Promise<Parcel> {
         const { position } = createParcelPointDto

         const polygon: Polygon = {
             type: 'Polygon',
             coordinates: position
         }

         const parcel = this.parcelRepository.create({
             polygon,
         })

         await this.parcelRepository.save(parcel)
         return parcel
     }
 }

POST请求JSON

  {
      "polygon" : [
          [ 102.016680916961207, 14.876721809875564 ], 
          [ 102.016926580451127, 14.876676829236565 ], 
          [ 102.016936960598585, 14.876688939408604 ], 
          [ 102.017125533277465, 14.876656068941644 ], 
          [ 102.017130723351187, 14.876638768695875 ], 
          [ 102.017360816619913, 14.876598978130607 ], 
          [ 102.017243174948689, 14.87595713901259 ], 
          [ 102.017000971507926, 14.876002119651588 ], 
          [ 102.016994051409625, 14.875983089381243 ], 
          [ 102.016789908509551, 14.876022879946511 ], 
          [ 102.016786448460394, 14.876047100290586 ], 
          [ 102.016559815240825, 14.876090350905008 ], 
          [ 102.016680916961207, 14.876721809875564 ]
      ],
  }

我不知道如何通过 POST 请求处理 GeoJSON 类型到 typeorm 中。如果有人有解决办法，请帮助我。

Answer 1

我已经解决了这个问题。在这种情况下，您需要将 Dto 中的类型定义为数字。维度必须与位置类型相同，并且在创建多边形对象时在坐标上增加一维。

例如，Polygon类型需要接收Position[][]中的坐标。因此，创建Polygon对象时需要在Dto中定义多边形类型为number[][]，坐标定义为[polygon]。

代码示例：

Dto

 import { IsOptional } from "class-validator";

 export class CreateParcelPointDto {
     @IsOptional()
     polygon?: number[][]
 }

服务

 import { Injectable } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
 import { Polygon } from 'geojson';
 import { CreateParcelPointDto } from './dto/create-parcel-point.dto';
 import { ParcelRepository } from './parcel.repository';
 import { Parcel } from './parcel.entity';

 @Injectable()
 export class ParcelService {
     constructor(
         @InjectRepository(ParcelRepository)
         private parcelRepository: ParcelRepository
     ) {}

     async createParcelPoint(createParcelPointDto: CreateParcelPointDto): Promise<Parcel> {
         const {
             polygon,
         } = createParcelPointDto

         const polygonCreated: Polygon = {
             type: 'Polygon',
             coordinates: [polygon] //Need one more dimension here.
         }

         const parcel = this.parcelRepository.create({
             polygon: polygonCreated,
         })

         await this.parcelRepository.save(parcel)
         return parcel
     }
 }

如何将 GeoJSON 多边形数据发送到 typeorm (NestJS)？

How can I send GeoJSON polygon data into typeorm (NestJS)?

postgresql

postgis

geojson

typeorm

nestjs